Can the fittings that were previously connected with a 60 degree cone tubing be connected with a 74

Hello landlord, whether it can be connected depends on whether the thread is the same, as long as the thread can be done. Because the cone does not seal, there are two types of sealing: one is a threaded seal, such as:

Fine tooth threads, taper threads, and some also add raw material belts to the threads; The other is the end seal, that is, the combination of gasket sealing, which is more stressed. If the thread can be connected at 74 degrees, it should fit better than 60 degrees.

Whether it can be connected depends on whether the thread you connect is the same, as long as the thread can be on the line, it should be that the cone does not have a sealing effect, and there are two kinds of sealing roles: one is a thread seal, such as a fine tooth thread, a taper thread, and some also add a raw meal belt to the thread; The other is the end seal, that is, the combination of gasket sealing, which is more stressed. If the thread can be connected at 74 degrees, it should fit better than 60 degrees.

As long as the thread can be done, there should be no sealing effect on the cone surface, and there are two kinds of sealing roles: one is thread sealing, such as fine tooth threads, taper threads, and some also add raw material belts to the threads; The other is the end seal, that is, the combination of gasket sealing, which is more stressed. If the thread can be connected at 74 degrees, it should fit better than 60 degrees.

In genetic engineering, two DNA molecules or two ends of a DNA molecule are enzymatically digested to be paired and then covalently linked by ligase. Synthetic hexamer linkers (nicks containing a specific enzyme) are commonly used, and multiple hexamer linkers can also be linked together to form polylinkers.

No, the sealing surface is not matched, if you really want to change it, you can use spherical sealing instead.

In the flared pipeline connection, one end of the conduit is flared to form an inner cone that is consistent with the cone angle of the pipe joint, and the cone angle is 74°, while the outer cone is consistent with the angle of the inner cone of the flat nozzle, and the cone angle is 66°.

Applicable medium of flared pipe joints: oil, water, gas and other non-corrosive or corrosive medium pipe joints, the specifications of steel pipes are relatively flexible, and after welding with pipelines, they have the characteristics of reliable connection and good sealing performance, so they are widely used in oil refining, chemical industry, light industry, textile, national defense, metallurgy, aviation, shipbuilding and other systems; It is also suitable for all kinds of mechanical engineering, machine tools and equipment and other hydraulic transmission pipelines.

The flared pipe fitting is mainly used with a 74° cone, and the non-flared type is used with a 24° cone

The general domestic regulation is 74 degree outer cone thread.

Hello! The general domestic regulation is 74 degree outer cone thread.

The inch thread (also known as the Wyeth thread) has a profile angle of 55 degrees, and the American thread (also known as the uniform thread) has a profile angle of 60 degrees, and these two threads are the most used threads except for the metric thread.

Corresponding to the imperial thread, China's national standard is "GB T 55° Sealed Pipe Thread Part 1: Cylindrical Internal Thread and Conical External Thread", "GB T Sealed Pipe Thread Part 2: Conical Internal Thread and Conical External Thread", "GB T 7307-2001 55° Unsealed Pipe Thread".

Corresponding to the American thread, China's national standard is "GB T 20666-2006 Unified Thread Tolerance", "GB T 20667-2006 Unified Thread Limit Size", "GB T 20668-2006 Unified Thread Basic Size", "GB T 20670-2006 Unified Thread Diameter and Number of Teeth Series".

First of all, the first one is the international metric female thread flat joint.

The second is the International Metric Compression Fitting.

The third is the international metric female thread 74 degree inner cone joint.

The fourth is the international metric female spherical joint.

The fifth is the hydraulic support joint for mining.

There are some points that need to be paid attention to in the process of using high-pressure tubing joints.

First, we must pay attention not to cause friction on the surface when handling high-pressure tubing, so as not to cause damage, although the hose is used for use, but we can not let the appearance of the high-pressure tubing leak.

Second, the high-pressure oil pipe can not be bent, which will lead to the internal damage of the high-pressure oil pipe, and add a lot of unnecessary trouble to the future use.

3. Don't use the high-pressure oil pipe as soon as it comes up, it is recommended to filter it with water and the like, some high-pressure oil pipes are acid and alkali resistant, and we can't use the liquid that conflicts with the current liquid for testing.

Fourth, when installing the high-pressure oil pipe joint, it must be tightened to prevent liquid leakage.

Find a professional crimping joint with a special machine crimping.

The force of the seizure machine cannot be large or small.

For 24-degree conical surfaces, there is generally no need to grind them. As long as there is no problem with the angle and accuracy of machining, it is fine.

We don't grind, we use raw tape.

There are mainly end straight joints, straight joints, tee joints, elbows, joints with live nuts, hinged joints, plugs, transition joints, etc., and the materials commonly used are stainless steel and carbon steel metric, American and imperial thread standards.

Joint accessories include: nuts, ferrules, flared cores, flared sleeves, flared nuts. Pipe fittings are used for linear connections such as instruments, and the connection forms are socket welding or threaded connections.

It is mainly used for small-diameter low-pressure pipelines, for parts that need to be assembled and disassembled frequently, or for the final adjustment of pipelines using threaded fittings.

There are several commonly used types of high-tech tubing joints: A, D, C, B, F, G, H, K; Among them, various joints are divided into direct, 90 degree bending and 120 degree bending, type A is a plane sealing type, D is a spherical sealing type, generally used with C type, C type and 74 degrees; It is matched with 24 degrees G type, type and 74 degree G type in turn; Type B is a ferrule fitting that matches the 24 degree C type; Type F is a disc joint, which is fixed on a flat surface with two clips and sealed, and is mostly used in construction machinery; There are 3 types of G type, which are 74 degrees, and are matched and sealed with C type of the same degree; Type H is a sealing groove machined on the cone surface of the 24 degree G type, which is sealed with the 24 degree C type; Type K is a quick-change joint, which is not fastened with a nut and adopts a piston plus Cashaw sealing method, which is easy to replace and is often used in coal mines.

etc., or straight-through, right-angled, tee-. or flared type, card sleeve type.

The high-pressure tubing should be removed and the tubing joints should be inspected.

The cone of the joint, if the cone of the joint is seriously damaged, should be replaced immediately. If there is no obvious damage to the joint cone, there is no need to replace the tubing with a new one; At this time, the emergency solution is to pad a section of plastic pipe with a length of 1 2 mm and a diameter of about 5 mm at the cone fit of the high-pressure tubing, or pad a small piece of copper gasket with a diameter slightly larger than the inner diameter of the tubing, and tighten the nut. If the metal low-pressure oil pipe is leaking, you can remove it, wipe the oil leakage smoothly with an abrasive cloth, and then cover it with a piece of bronze skin soaked in borax (about thick, put it on the stove to heat.

Oil leakage in the connection part of the high-pressure oil pipe may be caused by the poor sealing of the connection seal cone of the high-pressure oil pipe, fuel injector and high-pressure oil pump. Through the inspection, the high-pressure oil pump, the injector are excluded, and the finished cold heading cone surface of the high-pressure oil pipe is also in line with the drawings, but there is a certain error in the bending size, which will produce additional stress on the installation. Due to the vibration of the high-pressure tubing and the installation stress caused by the bending error of the high-pressure tubing, the sealing surface is not tightly sealed.

Through the magnified projection inspection of the high-pressure tubing sealing cone, it is found that the cone surface is slightly incomplete, the surface shape is irregular, and some high-pressure tubing sealing cones still have slight bumps, which are caused by collisions with each other in the process of parts transfer. These all lead to the problem of leakage after installation of the high-pressure tubing connection surface is not tightly sealed.

The production method of high-pressure tubing is to use a mixer to mix the inner layer of rubber, the middle layer of rubber and the outer layer of rubber according to the formula; Extrude the inner tubing with an extruder and wrap it on a soft or hard core coated with a release agent (liquid nitrogen freezing method can also do without a die); The calender presses into a thin sheet of medium-layer glue, adds a separator to wind, and cuts it to the specified width according to the process requirements; Wrap the inner layer of the tubing pipe containing the core with copper-plated steel wire or copper-plated steel wire rope on the winding machine or braiding machine, and at the same time, the middle layer of rubber sheet is synchronously wound between every two layers of copper-plated steel wire or copper-plated steel wire rope in the winding machine or braiding machine, and the beginning and end of the winding steel wire are tied (some early winding machines need to prestress and shape the copper-plated steel wire in advance); Cover the extruder with an outer layer of glue again, and then wrap it with lead or cloth vulcanized protective layer; vulcanization by vulcanization tank or salt bath; Finally, the vulcanization protective layer is removed, the core is extracted, the upper pipe joint is crimped, and the sample is pressed for inspection. In short, there are many types of equipment and raw materials used in the manufacture of high-pressure tubing, and the production process is complex.

However, in recent years, the production process of hydraulic tubing with plastic or thermoplastic elastomer as the main raw material can be appropriately simplified, but the price of raw materials is high, and rubber raw materials are still the main ones.

Precautions for metal hose installation.

The bellows of the metal hose are made of chrome-nickel austenitic stainless steel, which can withstand the maximum pressure according to the diameter.

Precautions for metal hose installation.

1. After the user conducts the hydrostatic test on the equipment and pipe system equipped with metal hoses, it should prevent the impact of rust blocks and the deposition of chloride-containing sediment, which will cause corrosion and mechanical damage.

2. During installation, the metal hose should be prevented from spatter scalding and mechanical damage during welding, otherwise it will cause leakage.

3. The sealing pipe system should strictly abide by the safety operation procedures to prevent the hose from being pulled off or burst due to overpressure caused by improper operation or other factors.

4. Please carefully digest the example of metal hose installation method, and install and use it in strict accordance with the correct sketch.