Knowledge/FAQ

Precautions for use:

For the fluid to conduct a dissolution test of the sealing material, confirm whether the material is suitable.

Use Teflon sealing tape for the external thread of the control thread.

Do not exceed the maximum tightening torque when installing the threads to prevent damage.

To reduce friction (insertion load) and protect the “O” ring when inserting, apply fluid or pure water to the “O” ring or quick coupling (“O” ring pleats).

When separating, a small amount of fluid flows out, and in order to prevent danger, compressed air can be used to discharge and separate the fluid inside the quick joint.

Please do not use it as a twisted link.

Do not use anything other than a quick fluid coupling.

Do not artificially hit, bend, stretch, or prevent damage.

Do not pressurize the casing or quick coupling unit to prevent the valve from flying out.

The specified dust cover must be attached to the unit.

Do not disassemble the quick connector.

There are thousands of reasons for hydraulic hose failure, but with the most appropriate precautions, the most common failures can be avoided. Here are the 8 most common causes of hose failure.

1.Inner rubber layer corrosion

Corrosion of hydraulic hoses often causes external leakage. Inner rubber layer corrosion is usually caused by concentrated high velocity fluids or by fine particles in the fluid.

To avoid corrosion of the inner rubber layer, determine the appropriate hose size based on the recommended maximum flow rate. In addition, it should be ensured that the hose assembly does not produce excessive tight bending and that the fluid medium does not cause excessive abrasion of the inner rubber layer of the hose. It is important to comply with the maximum bend radius and diameter requirements specified in each hose engineering specification during hose assembly.

2. Fluid compatibility

Incompatible fluids can cause deterioration, expansion, and delamination of the inner layer of the hose assembly. In some cases, the inner layer may also be partially destroyed.

The hose must be compatible with the fluid being transported. Make sure that the fluid is not only compatible with the inner layer, but also with the outer layer, joints and even O-rings.

3. Dry air / old air

The inner layer of the hose may create many tiny cracks due to stale or dry air. Sometimes this type of failure is difficult to detect because the hose can still remain flexible, but there are signs of external leakage.

To avoid dry or obsessed air problems, you should verify that your hose rating is suitable for extremely dry air. For these applications, it is best to use a hose with PKR or EPDM rubber rubber material. If possible, increase the dew point of the air.

4. Minimum bending radius

If the minimum bend radius is not met, the hose assembly may fail relatively quickly.

In vacuum or suction applications, if the bend radius is exceeded, the hose may become flat in the bend area. This will hinder or limit the flow of the medium. If the bend is too severe, the hose may become kinked. To prevent hose failure with minimal bend radius, the recommended bend radius should be carefully checked.

Quick Connector For Inert Gas Note:

1. Please use the sealing material for the external thread of the control thread.

2. Do not artificially hit, bend, stretch, or prevent damage.

3. Please do not use it for fluids other than fluids.

4. Please do not use it for purposes other than quick connectors.

5. Do not connect to quick fluid couplings from other companies.

6. Do not use it in places such as metal powder or sand dust to prevent malfunction or leakage.

7. If the foreign matter is attached, it may cause poor work or leakage.

8. The brake valve must be set before the quick connector.

9. Please do not use it as a hinge joint.

10. If used in machines with vibration and shock, the durability will be reduced.

1. Basic tooth type: tooth angle 60°. The taper is 1:16. The tooth type is a flat top.

2. Basic types

NPT general purpose US standard taper pipe thread

American standard straight pipe thread for NPSC pipe joints

NPTR guide rod connection with American standard taper pipe thread

Free-fit mechanical connections on NPSM devices with US standard straight pipe threads

Loose-fit mechanical connection of NPSL lock nut with US standard straight pipe thread and UNS–thin wall pipe for special uniform thread on thin-walled pipe

1. Dry-sealed pipe threads are mainly used for fuel and lube pipe fittings, refueling and draining plugs, military gas bombs, etc. for coolers, ships, automobiles and aircraft.

2. The characteristics of the dry-sealed pipe thread is to control the amount of flattening of the crest and the bottom of the tooth to ensure that the contact between the metal and metal outside the crest is first or simultaneously with the side contact. Contact between the crest and the base prevents thread leakage and ensures a tight seal connection without the use of lubricant and seal packing.

3. Dry-sealed inner pipe threads can be cylindrical or conical. The dry-sealed outer pipe thread has only one conical shape. All dry-sealed pipe threads are right-handed.

 China’s hydraulic oil pipe has been very mature after years of development. Hydraulic oil pipes are mainly used for non-corrosive or corrosive media such as oil, water and gas. With the increasing demand for such products in many fields, the promotion and promotion of such products is also called the focus of business work. The hydraulic pipe joint is a component between the high pressure oil pipe and the high pressure oil pipe in the hydraulic system.

   Hydraulic pipe fittings can be divided into hydraulic hoses, high pressure ball valves, quick fittings, ferrule type pipe fittings, welded pipe fittings, high pressure hoses, transition pipe fittings, ferrule type pipe fittings, three-way pipe fittings, and the like. Hydraulic oil pipe is a kind of special product. The key points that need to be paid attention to when promoting it are the hydraulic oil pipe fittings specification standard. The hydraulic oil pipe fittings specification standard is often the focus of users. Because the impact of the sudden bursting of the hydraulic oil pipe is very large, it is not possible to replace the special fittings with ordinary ones, because the hydraulic pressure can withstand a lot of pressure, and the normal maximum pressure of 0.5 is already fast.

1. Mark: 3/8-18NPT.

2. Basic diameter and reference distance: The basic diameter of the taper pipe thread is determined according to the outer diameter of the pipe, the pitch and the length of the hand. The nominal length of the hand-threaded joint between the inner and outer threads is the reference distance, and the base of the internal thread. The surface is the section at the large end of the thread (the diameter of the thread on the section is the basic diameter), and the base of the external thread is at a reference distance from the small end.

3. Common thread size

Size code Number of teeth per inch Large diameter Medium diameter Small diameter Recommended bottom hole Reference distance Number of teeth

1/8 27 10.242 9.489 8.736 φ8.6 4.102 4.36

1/4 18 13.616 12.487 11.358 φ11.1 5.786 4.10

3/8 18 17.055 15.926 14.797 φ14.5 6.096 4.32

1/2 14 21.223 19.772 18.321 φ17.9 8.128 4.48

3/4 14 26.568 25.117 23.666 φ23.2 8.611 4.75

1 11.5 33.228 31.461 29.694 φ29.2 10.160 4.60

1-1/4 11.5 41.985 40.218 38.451 φ37.9 10.668 4.83

1-1/2 11.5 48.054 46.287 44.520 φ43.9 10.668 4.83

Precautions for use:

1.Do not use fluids other than fluids.

2.Do not exceed the maximum use pressure limit when using.

3.Do not use outside the operating temperature range to prevent the seal material from being worn or leaking.

4.Do not artificially hit, bend, stretch, or prevent damage.

5.Do not use it in areas such as metal powder or sand to prevent malfunction or leakage.

6.For the installation of thread type, do not exceed the maximum tightening torque during installation to prevent damage.

7.Do not use hoses with cracks to prevent leakage or falling off.

8.For use in machines with vibration and shock, the durability will be reduced.

9.The fluid used must be a clean fluid that has been filtered through the filter.

10.Do not disassemble the quick connector.

(1) The most important part of the pre-installation of the 1 ferrule type pipe fitting directly affects the reliability of the seal. A dedicated preloader is generally required. fittings with small pipe diameters can be pre-assembled on vise. The specific method is to use a fitting as the mother body and press the nut and the ferrule onto the pipe. There are mainly types of ferrule-type straight-through pipe fittings, ferrule-type straight-through heads, and ferrule-type three-way pipe fittings. The author found that even if the same manufacturer has a batch of goods, the depth of the tapered holes on these fittings is often different, resulting in leakage, and this problem is often overlooked. The correct way to do this is to connect the connector at one end with the connector, and the corresponding connector is pre-assembled with the same type of connector to minimize leakage. 2 The end face of the pipe should be flush. After the pipe is sawn, it should be ground and smoothed on tools such as grinding wheels, and the burrs should be removed, cleaned and washed with high-pressure air before use. 3 When pre-installing, the coaxiality of the pipe and the fitting body should be kept as much as possible. If the pipe is too skewed, the seal will be invalid. 4 The pre-loading force should not be too large, so that the inner edge of the ferrule is just embedded in the outer wall of the pipe, and the ferrule should not be obviously deformed. When connecting the pipes, assemble them according to the specified tightening force. The tightening force of the ф6-1 ferrule is 64-1 15n, 16 фmmr 259n, and ф18mm is 450n. If the ferrule is severely deformed during pre-assembly, the sealing effect will be lost.

(2) It is forbidden to add fillers such as sealant. In order to obtain a better sealing effect, a sealant was applied to the ferrule, and as a result, the sealant was flushed into the hydraulic system, causing malfunction of the hydraulic component clogging.

(3) When connecting the pipeline, the pipe should have sufficient deformation allowance to avoid the tensile force of the pipe.

(4) When connecting the pipeline, it should be avoided to be subjected to the lateral force, and the lateral force is too large to cause the seal to be not strict.

(5) When connecting the pipeline, it should be done once and avoid multiple disassembly, otherwise the sealing performance will be deteriorated.

Card ferrule fitting installation

(1) Pipes requiring pickling shall be pickled prior to the requirements of Chapter 9;

(2) Cut the pipe with a saw or a special pipe cutter according to the required length. It is absolutely not allowed to use melt (such as flame cutting) or grinding wheel cutting; remove the inner and outer round burrs, metal chips and dirt at the pipe end; remove the rust of the pipe fitting. Agent and dirt; at the same time ensure the roundness of the pipe;

(3) Insert the nut and the ferrule into the tube successively, and the front edge of the ferrule (small diameter end) is at least 3 mm away from the tube mouth, and then the tube is inserted into the taper hole of the fitting body, and the top is up;

(4) Tighten the nut slowly and turn the tube until it is not moving, then tighten the nut 2/3~4/3 times;

(5) Disassemble the inspection ferrule if it has been cut into the pipe and the position is correct. The ferrule is not allowed to move axially and can be rotated slightly;

(6) Re-tighten the nut after passing the inspection.

1. UNC Coarse Thread Series This series is usually used in mass-produced bolts, screws, nuts and other general engineering. Low-strength materials, such as castings, mild steel and other soft materials, should be threaded with internal threads to give the internal threads the best trip strength. UNC threads are suitable for applications requiring quick disassembly or possible corrosion and minor damage.

2. UNF Fine Thread Series This series is suitable for bolts, screws, nuts and other applications where coarse threading is not appropriate. The UNF external thread has a larger tensile stress area than the coarse thread. Fine threading is preferred when the tripping strength of the external thread and the matching internal thread is required to be equal to or higher than the tensile load carrying capacity of the externally threaded part. Fine thread is also suitable for short screw lengths, small thread lift angles or wall thicknesses where fine pitch is required. If the maximum strength of the external thread is not required, the fine thread can also be used for the internal thread processed on the low-strength material, but the appropriate screw length must be selected to meet the above-mentioned trip strength requirements.

   Fine thread sizes less than or equal to 1 inch are suitable for bolts, screws, nuts and other threaded fasteners. Sizes greater than 1 inch, fine thread not applicable unless the internal and external threads are of the same material.

3. UNEF Superfine Thread Series This series is suitable for thin-walled tubes, thin nuts, short sleeves or short joints where short-threading lengths and smaller pitches are required. In general, it also applies to several cases specified above for fine thread.

4. UN constant pitch series of various constant pitch series of 4, 6, 8, 12, 16, 20, 28 and 32 teeth per inch provides a wide range of diameters for special design requirements not met by the UNC, UNF and UNEF series. / pitch combination. The constant pitch series is used for parts that have been assembled and disassembled multiple times or for parts that are refurbished. When selecting threads from a constant pitch series, the list of 8, 12 or 16 teeth should be preferred.

5. High-temperature and high-strength applications For these applications, it is recommended to use a coarse thread series for threads with a size of 0.25 to 1 inch, and a series of 8 teeth for sizes larger than 1 inch.

Installation precautions for high pressure hose fittings 

(1) The hose cannot be bent excessively during moving or stationary, nor can it be bent at the root, at least 1.5 times its diameter;

(2) When the hose is moved to the extreme position, it should not be pulled too tightly and should be slack;

(3) Try to avoid the torsional deformation of the hose;

(4) The hose should be as far away as possible from the heat radiation member, and the necessary heat insulation board;

(5) The external damage of the hose should be avoided, such as long-term friction on the surface of the same component in use;

(6) If the hose is excessively deformed due to its own weight, there should be a supporting member.

In hydraulic systems, whether it is a metal pipe joint or a hose joint, there is a problem that leakage is likely to occur. For the ferrule type pipe joint, most of the pipe is subjected to a large external force or impact force, causing the ferrule to loosen or the pipe end face to be deformed to cause leakage. At this time, it should be checked whether the ferrule is out of round, the cutting edge is defective, and the pipe end is Integrity and the degree of compression of the ferrule nut, etc., while eliminating the external force of the pipe. For the flared pipe joints, most of them are caused by excessive flare, quality is not required or disassembled many times, causing leakage due to flaring deformation or cracking. At this time, the front end can be cut off and re-expanded. If the male and female cones are used for sealing, the leakage is mostly due to the damage of the two tapered surfaces, and the tapered surface can be ground with abrasive sand. In some cases where the “о” ring is sealed by the end face or the outer diameter, the leakage causes the following: “о” ring is aged or deformed to cause leakage; “о” ring assembly is not in place, so that the two planes are connected The pressure is not flat or the “о” ring is cut to cause leakage; the “о” ring is not compacted, and the amount of elastic deformation is insufficient to cause leakage; the “о” ring is too deep to cause leakage. In this regard, it is necessary to re-select the “о” ring with the same outer diameter and thick section, or cut or grind the sealing plane with the groove to reduce the depth of the groove, so that “о” The ring has sufficient elastic deformation (the compression should generally be between 0.35 and 0.65 mm). For the leakage of pipe joints with oil-resistant rubber sheets, wool felts, mild steel cardboard, combined sealing gaskets or sealants, no matter what material, first check the seals for damage, deformation, aging and roughness. And then take the appropriate measures.

(1) Pipes should try to avoid high temperature radiation and cooling water spray, etc., where the temperature is too high or too low, especially the hose joint;

(2) The piping should not affect the operation of the main equipment, etc. It must be safe and reliable, convenient for work, observation and maintenance;

(3) The pipe should be horizontal and straight, neat and beautiful. Minimize cornering or small angle bends, use large arcs to reduce oil flow resistance;

(4) When the installation is in conflict, the small pipe and the low pressure pipe should be made to allow the high pressure pipe;

(5) Pipes shall not be in contact when they cross each other and shall be separated by a certain distance;

(6) The joints of parallel pipes should be staggered to avoid affecting the installation and disassembly;

(7) For the purpose of easy disassembly and cleaning, the joint should be properly installed, but it should be used less to reduce the possibility of leakage.

In hydraulic systems, whether it is a metal pipe fittings or a hose fittings, there is a problem that leakage is likely to occur. For the ferrule type pipe joint, most of the pipe is subjected to a large external force or impact force, causing the ferrule to loosen or the pipe end face to be deformed to cause leakage. At this time, it should be checked whether the ferrule is out of round, the cutting edge is defective, and the pipe end is Integrity and the degree of compression of the ferrule nut, etc., while eliminating the external force of the pipe. For the flared pipe joints, most of them are caused by excessive flare, quality is not required or disassembled many times, causing leakage due to flaring deformation or cracking. At this time, the front end can be cut off and re-expanded. If the male and female cones are used for sealing, the leakage is mostly due to the damage of the two tapered surfaces, and the tapered surface can be ground with abrasive sand. In some cases where the “о” ring is sealed by the end face or the outer diameter, the leakage causes the following: “о” ring is aged or deformed to cause leakage; “о” ring assembly is not in place, so that the two planes are connected The pressure is not flat or the “о” ring is cut to cause leakage; the “о” ring is not compacted, and the amount of elastic deformation is insufficient to cause leakage; the “о” ring is too deep to cause leakage. In this regard, it is necessary to re-select the “о” ring with the same outer diameter and thick section, or cut or grind the sealing plane with the groove to reduce the depth of the groove, so that “о” The ring has sufficient elastic deformation (the compression should generally be between 0.35 and 0.65 mm). For the leakage of pipe fittings with oil-resistant rubber sheets, wool felts, mild steel cardboard, combined sealing gaskets or sealants, no matter what material, first check the seals for damage, deformation, aging and roughness. And then take the appropriate measures.

Hydraulic joints are different hydraulic components (pumps, transfer lines, reversing valves, shut-off valves, Hydraulic motors, hydraulic cylinders, and some auxiliary components, such as liquid level gauges, thermometers, pressure gauges, etc., are connected to form a closed loop hydraulic system, which is a fitting for connecting. The sample image is shown on the right:

The high-strength pressure that the hydraulic joint can withstand. If the hydraulic oil pipe joint has blisters, small holes or too high pressure, it cannot withstand such a large pressure, and the impact force generated by the blasting is quite large.

Hydraulic joints are mainly divided into two categories: hose joints, hard joints

Each of these two categories is divided into several subcategories:

1) Hose fittings are divided into one-piece hose couplings, crimping hose couplings, and internal locking hose fittings, detachable hose fittings, etc.

2) The hard pipe joint is also called the transition joint. It is divided into DIN card sleeve type and metric thread joint.

Inch threaded joints, American threaded joints, welded flanges, mining joints, etc.

Hydraulic joints are widely used in military, energy, petrochemical, electric power, ships, automobiles, rail transit,In the hydraulic piping system of various industries such as construction machinery, mining, metallurgy, steel mills and marine engineering.

The hydraulic air quick connector is mainly used for air piping and pneumatic tool fittings. A wide variety of body materials, sizes, and mounting shapes are available for their use.

Precautions for use:

1. Please do not use it for purposes other than quick fluid couplings.

2. Please do not use it for fluids other than fluids.

3. Please do not connect with fast fluid connectors from other companies.

4. Do not exceed the maximum operating pressure when using.

5. Do not use outside the operating temperature range to prevent the seal material from being worn or leaking.

6. Do not artificially hit, bend, stretch, or prevent damage.

7. Do not use it in places such as metal powder or sand dust to prevent malfunction or leakage.

8. If you attach debris, it will cause poor work or leakage.

9. Do not disassemble the quick connector.

(1) The hose cannot be bent excessively during moving or stationary, nor can it be bent at the root, at least 1.5 times its diameter;

(2) When the hose is moved to the extreme position, it should not be pulled too tightly and should be slack;

(3) Try to avoid the torsional deformation of the hose;

(4) The hose should be as far away as possible from the heat radiation member, and the necessary heat insulation board;

(5) The external damage of the hose should be avoided, such as long-term friction on the surface of the same component in use;

(6) If the hose is excessively deformed due to its own weight, there should be a supporting member.

HYDRAULIC FITTING

HYDRAULIC FITTING

HYDRAULIC FITTING

Metric fitting including the metric female , metric male and metric adapter fittings , they are very common used in the world , almost every customer will buy this type of fitting most, type have 20111 , 20411 , 20511 and so on .

A system in the formal input before the general need to go through the rinse, the purpose of rinsing is to remove residues in the system contaminants, metal chips, fiber compounds, iron cores, etc., in the first two hours of work, even if not completely damaged the system, will cause a series of failures. 　　

Therefore, the following steps should be taken to clean the system oil path: 1, with a easy-to-dry cleaning solvent to clean the fuel tank, and then with filtered air to remove solvent residue. 　　

2, cleaning system all piping, in some cases need to be impregnated with pipes and joints. 　　3, in the pipeline loading oil filter, to protect the valve of the tubing road and pressure pipeline. 　　

4. Install a flushing plate in the collector instead of a precision valve, such as an electro-hydraulic servo valve.

5, check whether all piping size is appropriate, the connection is correct. All along, we have a professional brand, innovation and development, reputation for survival, Service tree image, well received by our customers! We sincerely welcome friends from all walks of life come to discuss cooperation and work together to create tomorrow.

One: According to the equipment operating conditions (temperature) and hydraulic media conditions, select the appropriate hose. Hose work environment temperature through high or too low will affect the life of the hose and pressure capacity, so to the extent permitted to use hoses, operating temperature for a long time is not within its allowable range of the system, should be used soft pipe sets or procurement of special hoses.

If it is a special medium, make sure that the inner, outer, joint, and sealing rings of the hose are compatible with the media. Second, according to the pressure of the system, determine the maximum working pressure of the hose. Each hose has a maximum working pressure, and the blasting pressure of the hose is 3-4 times the maximum working pressure. The higher the pressure resistance of the hose, the higher the price, so according to the actual pressure of the system, choose the maximum working pressure of the hose, can ensure the normal operation of the system, but also save procurement costs.

If the system impact pressure is frequent, to choose a hose with a high pulse life, at the same time, the maximum working pressure of the purchase hose should be appropriately improved. Third, according to the flow of the choice of hose inner diameter, pipe diameter too small will increase the flow rate of the tube medium, so that the system heat, reduce efficiency, and will produce excessive pressure drop, affecting the performance of the entire system, pipe diameter over the General Assembly to increase procurement costs, affecting the normal operation of the system, so the hose inner diameter should be appropriate

When the hose is fixed with a pipe clamp or the hose passes through the steel plate, also pay attention to the outer diameter size of the hose. Four, in the selection of high-pressure hose should pay attention to the bending radius of the high-pressure hose, the calculation of the bending radius should be subtracted from the front joint buckle length.

If the hose bending radius of the device is too small, it will reduce the pressure capacity of the hose and reduce its service life.

Five, according to the hydraulic layout of the reasonable choice of joint way, joint angle and hose assembly assembly angle. Finally, the hose in the assembly process, but also need to pay attention to a few problems, hose too long, increase procurement costs; The hose is too short, when it is pressed to stretch or shrink, there is not enough telescopic allowance, will cause abnormal damage to the hose, hose assembly, do not let it twist, otherwise significantly reduce the service life of the hose, It even causes abnormal damage to the hose or loosening the joint, and the hose installed between the moving parts should be reserved for sufficient length and to prevent friction with other objects. If the hose is often in the use of friction with the hard object, it is recommended in the Tube plus spring sheath or soft pipe cover, nylon sheath, spiral protective sleeve, glue pipe cover and other sheath series.

1, before the use of inspection: before the use of hose, please confirm that the appearance of the hose has no abnormal trauma, hardening, softening, discoloration and so on.

2, regular inspection: During the use of hose, please be sure to implement 1 periodic inspection per month.

Iv. Security matters:

1, operators to wear safety protective clothing, including gloves, rubber boots, eye shields, these equipment is mainly used to protect the safety of operators.

2, to ensure that the work area is safe and orderly.

3. Check that the joint on each pipe is firm. 4. Do not put the pipe in a pressure-resistant state when not in use. The closing pressure extends the service life of hoses (silicone hoses, Teflon hoses, rubber hoses, food-grade hoses, sanitary hoses, thermoplastic rubber hoses, sanitary plastic hoses).

How to install the high pressure hose assembly correctly?  believes that the use of high-pressure hose friends will know that this installation method is very important, a little carelessness or the installation method is not correct, light will shorten the service life of the hose, heavy can cause safety hazards.   Here are some of the experiences I have learned and used to learn from. 

Correct installation of high-pressure hose is very important to the specific situation I am divided into six kinds. Do not let the high-pressure hose twist when installing a high-pressure hose.   

Otherwise, when the pressure is received, it will damage the high pressure hose or the connection is relaxed.   

When the bending radius of high pressure hose is too small, we should pay attention to the reasonable practice is to use right-angled joints to avoid sharp bend distortion of high pressure hose. When the high pressure hose is under pressure, the length of the high pressure hose will change  if the stroke of the steel wire layer inside the high pressure hose is large, the length of the pressurized high pressure hose will be shorter. Conversely, the length of the high-pressure hose will become longer.  General Products Some kind of error, so the length and shortening can not be avoided. If the high pressure hose is installed, there is a bending place. No fixing device should be added to the bending position of the high pressure hose. High pressure hoses should be allowed to move freely.   Once fixed to death, it is easy to cause increased wear and tear in the buckle.   

In order to avoid the damage of the high pressure hose and the limitation of the flow rate, the bending radius of the high pressure hose should be increased as much as possible.

When installing high pressure hose, remember not to let the high pressure hose twist or when under pressure it is easy to break the high pressure hose or make the buckle joint loose. Six  installation of high-pressure hose  should leave a certain amount of space  avoid the high pressure hose in the operation of friction with the object. If you can’t avoid  try to get some protective measures.

The inner adhesive layer of the hose directly bears the wear and erosion of the conveying medium and prevents its leakage, and the outer layer protects the skeleton layer from external damage and erosion, and the skeleton layer is the bearing layer of the hose, which gives the strength and stiffness of the tube body. The working pressure of the hose depends on the material and structure of the skeleton layer. Hose according to its skeleton layer material and structure can be divided into all-glue hose, clamp hose, attract hose, woven hose, winding hose, knitted hose, short fiber hose. Among them, the suction hose works under negative pressure, steel wire braided hose or winding hose can withstand 80~600mpa and even higher pressure.

Both the diagram method and the literal expression method can describe the structure of the hose assembly, but they are not as fast as the symbolic notation and are easy to organize production.

To this end, special development of this order guide.

Taking the type a hose assembly with inner diameter 16mm, two layers of steel, and a long 1000mm (the distance of the end surface of two cores) as an example, the corresponding provisions of various “joint forms” and “connecting nuts” are described.

First, both ends are direct head, Universal nut (refers to the single nut specification in accordance with JB/T8727-2004 requirements), omit “connector form” and “connector Nut”, writing:

A16Ⅱ-1000

Note: The number of wire braided or wire winding layers is expressed in Roman numerals Ⅰ, Ⅱ, Ⅲ, Ⅳ, etc.

Two, one end of the direct head, the other end of the the bend joint, Universal nut, writing:

16ⅱ-1000 A/aw

Note: When the elbow is at a different angle, add an angle after “w”, such as “W45°”.

Third, the two ends of the bend joint, the same direction, Universal nut, writing:

A16Ⅱ-1000 w/w V0°

Note: The two elbow space relative angle v commonly used in the division of 0°, A/R, 180°, 270°, the definition of the provisions of item eighth.

Four, the NUT is not universal or both ends of the NUT regulation is not the same, must be specified “connection nut” item, such as:

A16Ⅱ-1000 2-m30x1.5

A16Ⅱ-1000 m27x1.5-m30x1.5

A16Ⅱ-1000 m27x1.5-m30x1.5w

V. When the joint form of the two ends is different, the “joint form” item must be specified, such as:

16ⅱ-1000 A/D

16ⅱ-1000 a/m27x1.5-d/m30x1.5

Six, the two ends of the thread for the pipe thread or the United State Unified fine tooth thread, the thread code and specifications are stated, such as:

D16Ⅱ-1000 G3/4 “x14

C16Ⅱ-1000 UNF7/8 “x14

Seven, hose assembly with ordinary spring, after the length of the addition of “” symbol, such as: D16Ⅱ-1000

Hydraulic hose in the installation needs to master a certain amount of professional knowledge and experience, then what are the skills in the installation?

Today we come together to find out:

1, hose bending installation, should be maintained at the same level, to prevent distortion, so as not to cause leakage, abnormal blasting or pipe joint extraction and other phenomena in use. 2, hose assembly length to have a certain amount of surplus.

Because the hose is under pressure, it should be installed in a straight state, so that the hose should have a certain relaxation. 3, avoid the hose in the joint near the sharp bending.

If unavoidable, accessory accessories must be used to change the installation angle.

4. When the two ends of the hose are used for relative motion, the bending part of the hose shall always be kept on the same plane to prevent the hose from twisting and affect the service life. 5, to avoid the hose in the bending part of the fixed.

When it is necessary to be fixed, its bending radius should be taken at the position of the hose when pressurized, and an appropriate margin should be added.

6, if the hose is in the repeated bending use of the state, the hose should be fully stretched length, and its bending part radius control greater than the specified limit, in order to avoid extreme bending near the fixed joint.

7, the tube body in the mutual rubbing user, installation should be equipped with the appropriate fixture, to prevent direct contact with the tube body.

8, the two ends of the hose fixed on different planes, should be in the appropriate part of the hose clamping fixed, so that it formed their respective in the same plane movement of two parts.

9, Hose length selection and installation layout should be reasonable, as far as possible to avoid the formation of unnecessary bending, so easy to cause bending of the lateral tube blasting phenomenon. Have you mastered all of this introduction? Warmly welcome you to come to buy, we will be in line with the purpose of high quality and low price for your service.

1, suitable for all kinds of vibration, rapid rotation, large strength equipment and narrow space;

2, cost-effective, light weight, high precision;

3, can be equipped with manual hydraulic pump, pneumatic hydraulic pump and electric hydraulic pump;

4, a number of hydraulic nuts can be used at the same time;

5, do not need to use the scale, but by the structural design of the measuring ring, accurate and stable direct measurement of the bearing required axial force into the distance;

6, installation and disassembly of the discharge sleeve, you can use the same specifications of the hydraulic nut, which is the attached scale or hanging link block and other patented design of the hydraulic nut can not be equipped;

7, the use of measuring ring additional screws to decompose the nut replacement damaged O-ring, than the general design to save time and parts costs; 8, can be installed sealed bearings, no need to measure the internal clearance of bearings to determine the axial force of the bearing.

1. The tensile mode is not affected by the lubrication effect of bolts and the friction size of the thread, and more accurate bolt load can be obtained.

2, can be synchronized stretching of multiple bolts, so that the whole ring bolt Force is uniform, get a balanced load;

3, due to the use of the most advanced ultra-high pressure hydraulic technology, can be in a very small space to complete the locking of bolts;

4, stretching mode to fasten the bolts to obtain the residual load and payload than the torque mode is greater; 5, stretching method is more suitable for fastening precision requirements of high bonding applications, it can make the connection surface force evenly achieve bonding, really prevent leakage.

Hydraulic nut is an advanced bolt assembly method, especially suitable for narrow space and heavy load vibration mechanical fastening.

The working principle of the hydraulic nut is to use the hydraulic cylinder to apply the external force directly to the bolt, so that the bolts subjected to the force are elongated in its elastic deformation zone, and the bolts are stretched to tighten the locking ring on the hydraulic nut, so that the bolts will be locked in the elongated position. The hydraulic cylinder is located at the axis of the bolt and is used for axial stretching of the bolts to achieve the amount of stretching required by the bolts. And it is this stretch of the bolt that determines the clamping force required to fasten the bolt. When the hydraulic nut is pressurized, the bolts are stretched, while the hydraulic nut and the bonding surface are pressed. Thus the axial deformation of the bolt is locked, that is, the remaining bolt load is locked in the nut. Many connecting surfaces are equipped with gaskets. The gasket only works when the connecting surface is pressed, so it is especially important that the connection surface remains clamped at all times. The load applied to the bolt is proportional to the oil pressure in the hydraulic cylinder, and such a design can retain the payload with great precision. Since the load is applied directly to the bolt and all forces are used for bolt elongation, the load required to produce the minimum space.

Hydraulic nuts are used for bolts that need to be disassembled frequently, for pretightening of oversized bolts, and for locking of large workpieces. and can do hydraulic overflow connection disassembly tools. Installing or removing bearings on conical shafts or bushings is often a difficult and time-consuming project. Use hydraulic nuts. You can increase productivity and reduce such problems. The principle is that the hydraulic oil is generated by the high-pressure oil pump input nut to drive the piston force. Meet the installation or disassembly of bearings-effortlessly, both accurate and safe.