Hydraulic or pneumatic quick couplings, whether they can be used in vacuum systems.

Strictly speaking, it is not universal, but if the vacuum degree.

In principle, the quick connection of the vacuum pipeline has a special vacuum quick connector, and the diffusion pump has a strong vacuum pumping capacity, if you only open the quick connector when the pump is stopped, and keep the connection when working, it is recommended to use the hydraulic system.

However, if you need to open the quick connector during work or when there is a vacuum in the pipeline, it is recommended to choose a special vacuum quick connector (it should be difficult to buy, and a refrigeration joint like PCV is OK), because when the vacuum in the pipeline is large, it will overcome the spring pressure of the quick connector and cannot maintain the vacuum in the pipeline, or the vacuum level will be reduced at the moment of opening. If you must use hydraulic quick couplings, it is recommended to add a shut-off valve before the coupling.

Close the shut-off valve before opening the fitting. In this way, the pipe can be quickly disconnected without affecting the vacuum level in the pipeline. Suggested reference:

No, you cannot. Quick couplings are in principle two interrelated check valves, and in a vacuum system, negative pressure opens the closed check valve!

No, the coupling is either open and closed at both ends or one-way switching, and the relatively stationary coupling does not play a role in the design when it is in a vacuum.

Theoretically, it can be universal, but once something goes wrong, the price to pay is not small. It's best to find a special one, don't be afraid of trouble, or save a few cents.

No. First of all, the structure is not exactly the same.

Pneumatic directional valves require a higher tightness.

The pipe interface is also different, the hydraulic valve is generally threaded connection, while the pneumatic valve is plugged pneumatic joint connection.

If you plan to make your own quick connectors, put the middle diameter and wire diameter of the spring, as well as the stiffness, and customize it for the spring factory. The seal looks like a rubber ring, find a rubber manufacturer to customize, if the pressure is not high, you can use nitrile rubber.

The material, seal, medium, and pressure are all different.

Mind if the landlord asks for a professional, such as Intelli.

Because the vacuum suction cup is connected to the negative pressure system, it is not recommended to use the quick coupling, because the quick coupling is clamped from the outside of the hose, when there is negative pressure in the hose, the hose shrinks inward, the outer diameter becomes smaller, and there will be leakage, which is explained in detail as shown in the following figure.

However, vacuum is relative after all, if your system does not have high requirements for vacuum, then some leakage is no problem, for example, your vacuum suction cup system is designed to work safely at a vacuum pressure of -60kpa or above, then assuming that the seal in the full sense is -90kpa, if there is a pressure drop caused by the leakage of the quick coupling, the vacuum pressure of the system is -80kpa or -70kpa, which is also higher than your expectation of -60kpa, so the system can still work normally, And it's secure.

Of course, if you have to use quick couplings due to piping needs, and if the use of quick couplings in multiple places does cause high vacuum system pressure leakage, then you can switch to a vacuum generator with a higher flow rate than the current one, such as a vacuum pump or vacuum generator, and use the additional vacuum flow to compensate for the vacuum pressure loss caused by the use of the quick coupling.

PS: 1. If the sealing requirements of the vacuum suction cup piping are high, it is recommended to use a barb joint.

2. For the size selection of quick coupling specifications, such as 4, 6, 8, 10 or 12, etc., there is no clear requirement for this, the length of the pipeline and the thickness of the pipeline have corresponding effects, and they can also be understood as having little impact, it is recommended to use the suction cup you choose and the vacuum degree measured by the system in real time as a reference, if the vacuum degree is not high enough, you can increase the diameter of the pipe and the specifications of the quick connector.

3. Some vacuum generators also have requirements for the diameter of the pipe, so the selection of the piping and the selection of the quick connector can not be based on the selection of the suction cup alone, in this case, it is recommended to reverse the piping according to the piping requirements of the vacuum generator, and the basic principle is that the cross-sectional area of the main pipe should be greater than or equal to the cross-sectional area of each sub-pipe.

Not recommended. Low pressure, too.

If the pressure is not high, it is okay, not more than megapascals.

It can be sealed, it can be tried. Pneumatic, it shouldn't affect the effect.

No, first of all, the pressure is too low. In addition, the co-flow ability is also much worse.

So no.

Look at two points, the first pressure, the second sealing ring material.

Quick couplings are generally used in relatively large machinery, such as large-tonnage crawler cranes, truck cranes, because the weight is too large, can not be transported as a whole, it needs to be decomposed and transported, and at the same time, do not want oil leakage, it will be used to quickly connect, or often need to change the working conditions of the engineering vehicles will also use quick connectors, in short, it is very widely used, the market is also quite large, the heavy machinery industry will use, taking a 250-ton crawler crane as an example, a car size quick connection at least has to use more than a dozen sets, and then the large tonnage is more But the value of fast reception is expensive, if you really do this line of work, you must use a lot of money, if you meet customers and don't check out, it will be miserable, so there are benefits and risks.

The market is risky, and investors need to be cautious!!

If the equipment is used more, it will be difficult for customers to find

In the cable connection, one end of the quick connector is a plug-in interface of different styles, and the other end of the connection should also be installed with a corresponding plug, so that the quick plug-in function can be smoothly realized. The quick connector is not suitable for high-current cables, because of the skin effect of the current, most of the current will flow on the surface of the cable, if the quick connector makes the two cables on the contact surface of the slightest inaccuracy, it will cause a large resistance on the surface of the cable, when the large current passes, according to Joule's law, there will be a great heat and there is a risk of burning the cable.

Introduction: A quick coupling is a fitting that can be connected or disconnected without tools. Quick couplings can be divided into:

Quick couplings for air, quick couplings for oxygen, fuel and gas, quick couplings for gases and liquids, quick couplings for hydraulic oil, quick couplings for inert gases, quick couplings for cooling water temperature oil, and semiconductor quick couplings.

Maintenance function: cooling device of the computer, cylinder maintenance of the die-casting machine.

Test function: vacuum, withstand pressure, leakage, operation, etc.

Conveying function: conveying, handling and conductive functions of solids such as bolts and nuts.

Filling function: inert gas, nitrogen, PG, carbonic acid.

Connection functions: Fishing rods, fixing parts for pocket laser records, connecting for mobile work, and for applications other than fluid transportation.

After the male and female are docked, the valve core is opened, and the gas and liquid flow.

The drawing can not be given to you, the three-dimensional drawing can give you a reference, this is the female connector in the quick connector.

The main ways of mechanical connection are: welding, crimping, and threaded connection. The so-called fast depends on the specific situation, and the fast you say generally refers to crimping, but the same fast threaded connection can also be called a quick joint.

The principle is not difficult, it can be regarded as two check valves, when docking, the check valves are pushed against each other, the channel is open, and the valve core is self-closed when disconnected to ensure that there is no leakage when disconnected. From the schematic diagram, it is two check valves on top of each other.

The selection and use of check valves, ordinary joints, etc. are very different, and you need to choose the appropriate passage, pressure, sealing material, whether it operates under pressure, whether there is axial force radial force, etc. The wrong selection can have a great impact on the life expectancy.