what is the difference of hydraulic test couplings in market?

Though test coupling looks tiny and unnecessary,  hydraulic test system will be much more convenient with it. 

1. function of pressure test point

The test coupling is mainly used to measure the pressure of the fluid system, and there is a self-sealing valve inside.

When used alone, due to the action of the spring, the leakage of the system medium can be stopped.

The self-sealing valve can be opened after being connected to the measuring hose with thimble or pressure sensor, and the system pressure parameters can be displayed by the pressure gauge or tester, which is used for system pressure detection, system debugging and fault diagnosis of high or low pressure fluid system.

When set in a special position, hydraulic test point adapters can also be used for system medium sampling, system pressure relief and system exhaust.

Because the pressure test point connector is specially designed for pressure measurement and high/ low flow rate fluid sampling, the design has fully considered its pressure range.

And according to different scopes of use,  test points of different types and strengths have been designed, and these connectors also play an irreplaceable role in the work.

According to the different internal structure, the pressure test point structure can be divided into ball seal, piston seal and cone seal.

2.1 Ball seal structure

The ball seal pressure test coupling is mainly composed of a steel ball and a spring.

The thrust is generated by the spring pre-compression, so that the steel ball is pressed against the valve body mating surface to achieve sealing.

Features of the ball seal structure:  a simple structure,  a mechanical seal, not easy to age, and has good stability.

Another feature: the machining accuracy of the valve body contact surface is required to be high, the steel ball and the valve body are in line contact, and the sealing effect is average.

Internal structure of pressure test point with ball seal

2.2 Piston seal structure

The piston seal pressure test point adaptor is mainly composed of a piston, an O-ring and a spring. The sealing ring is in the piston groove.

Adhere to the sealing cone (radial seal) or flat surface (axial seal) through spring pre-compression thrust.

2.3 Cone sealing structure

The cone seal pressure test coupling is composed of a cone valve core, a cone seal and a spring.

The conical seal and the conical valve core are tightly attached to the conical mating surface of the valve body under the pre-compression thrust of the spring.

Internal structure of cone-sealed pressure test

Cone seal features: the conical valve core and the conical seal work together, the sealing is surface contact, the sealing effect is better, and the gas and liquid are universal;

The spring is integrated in the valve body and is not easy to loosen; but the processing accuracy of the valve body and spool is relatively high.

As a commonly used equipment in the industry, fluid pressure test points are known for their wide practical range and convenient connection and sampling. Especially when the fluid is used under high pressure and flow rate, it has many advantages and many conveniences.

So what are its advantages:

Advantage 1: The operation can be completed manually under high pressure

When the fluid is under high pressure, if the operation is careless, the higher pressure can easily cause the liquid to leak out, causing irreversible process accidents, and even life-threatening.

However, the pressure test hose connector fully takes this into consideration, so that the connector can be disconnected and closed simply by using both hands under high pressure.

Advantage 2: Small structure

Because sampling and pressure test locations are often not fixed, work needs to be done according to specific conditions and requirements.

Therefore, the compact shape brings great convenience in carrying and operating engineering.

Then there is the ability to easily connect with the meter.

Because of its unique purpose, the connection with the instrument is fully considered in the design, so the operation is easy and the connection is firm.

3. Summary

The hydraulic test point adapters is a very small component in the hydraulic system, but it plays an important role in the debugging, testing and diagnosis of the hydraulic system.

Through the pressure gauge or sensor, various pressure tests can be completed without disassembly and assembly and zero leakage.

Reasonable setting of pressure test point fittings in the hydraulic system brings a lot of convenience to debugging, testing and diagnosis.

In order to ensure a good application effect, it is indeed very important to choose a high-quality and reliable product.

The current evaluation of the pressure test point is very good, and the product design is excellent.

While ensuring large flow output, it can also ensure strict quality screening standards, so that the products can have a better use value.

Judging from the current situation, pressure test coupling are mainly also flexibly applied to various fluid systems.

However, the internal wiring of different fluid systems and the size of the connectors are different, so you need to do the flow control in advance before purchasing the corresponding pressure test point.

If the size does not match, it is also a troublesome thing.

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