How to write the qualified report of the pressure test of the repair valve

110% of sealing pressure Test time Test medium Pressure of valve body 150% test time Test pressure Composition report of valve material, yield strength Tensile strength.

It depends on which type of valve your valve belongs to, and the specific model is treated, and the pressure test is generally based on the original type of valve.

I don't know what you're talking about, in general, valves above DN50 don't use socket welding, I don't know if there is, at least I have worked in several chemical plants, so far I have not seen large-diameter socket welded valves. If the valve less than or equal to DN40 has socket welding, in principle, there is no need to test the pressure, because the valve has been pressed before leaving the factory. If you are not at ease, you can choose some formal enterprises to produce, and individuals are not recommended to buy in Henan and Sichuan, purely personal opinions.

The standards and specifications for valve pressure testing are as follows:

1. Under normal circumstances, the valve is not tested for strength, but after repair, the valve body and bonnet or the valve body and bonnet damaged by corrosion should be tested for strength. For safety valves, their constant pressure and return pressure and other tests should be in accordance with the provisions of their instructions and relevant regulations.

2. The strength and tightness test should be carried out for valve installation. 20% spot check of low-pressure valves, and 100% inspection should be carried out if unqualified; Medium and high pressure valves should be 100% inspected.

3. During the test, the valve installation position should be in the direction that is easy to check.

4. For valves in the form of welded connections, cone seals or O-ring seals can be used for pressure testing when the pressure test is not possible with the plate.

5. During the hydraulic test, the valve air should be excluded as much as possible.

6. The pressure should be gradually increased during the test, and it is not allowed to increase the pressure sharply and suddenly.

7. The duration of the strength test and the tightness test is generally 2 3min, and the important and special valves should last 5min. The test time of small-diameter valves can be correspondingly shorter, and the test time of large-diameter valves can be correspondingly longer. During the test, the test time can be extended if in doubt.

During the strength test, sweating or leakage of the valve body and bonnet are not allowed.

8. The throttle valve shall not be tested for the tightness of the closing parts, but the strength test and the tightness test at the packing and gasket shall be conducted.

9. In the pressure test, the closing force of the valve only allows a person's normal physical strength to close; Reinforcement with tools such as levers (except for torque wrenches) is not allowed, and when the diameter of the handwheel is greater than 320 mm, two people are allowed to close together.

10. The valve with the upper seal should take out the packing material for the sealing test, and check whether there is leakage after the upper seal is closed. When using gas for testing, fill the stuffing box with water for inspection. When the packing tightness test is carried out, the upper seal is not allowed to be in a tight position.

11. When testing the tightness of the valve with the driving device, the driving device should be used to close the valve for the tightness test. For manual actuators, the sealing test of the valve should also be carried out with dynamic closing.

12. The bypass valve installed on the main valve after the strength test and tightness test is carried out in the main valve; When the main valve shut-off is opened, it should also be opened.

13. During the strength test of cast iron valves, the valve body and valve cover should be tapped with a copper hammer to check whether there is leakage.

14. When the valve is tested, except for the plug valve, which is allowed to be oiled on the sealing surface, other valves are not allowed to be oiled on the sealing surface.

15. When the valve is pressed, the compression force of the blind plate on the valve should not be too large, so as to avoid the deformation of the valve and affect the test effect (if the cast iron valve is pressed too tightly, it will be damaged).

16. After the pressure test of the valve is completed, the water in the valve should be removed in time and wiped clean, and the test record should also be made.

"General Valve Pressure Test" GB T 13927-1992

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Experiment with pressure according to the multiple of the pressure used, for example, if you need to hit it, you need to hit it like this, and the same is true for high-pressure ones.

To be precise: according to the requirements of the national standard 13927: the strength test pressure of the valve is the times of the calibrated pressure, and the sealing test is the times of the calibrated pressure.

If you want to test the water pressure, it is best to hit the pressure specified by the valve. The doubling mentioned in the next complaint is the pressure on the test shell in the factory. Generally, the pressure of the assembled valve should not be exceeded.

The above buddy is very professional, and the pressure retention time is not the same according to different pipelines and different valves. If you want to buy a good valve, I can choose the type for you, Langfang Guanghao boiler electromechanical. steel market.

It depends: if the strength is not qualified, return it.

If the seal is unqualified, it can be returned and repaired.

If the seal is unqualified, it can be returned, and you can find a good fitter to grind it.

The pressure test of the valve includes: the shell test of the valve and the sealing test of the valve;

The housing test of the valve is to check the tightness of the valve body and bonnet, as well as the pressure resistance of the entire housing, including the connection between the valve body and the bonnet. The sealing test of the valve is a test to check the sealing performance of the opening and closing parts and the valve body.

First, the shell test steps:

1. Close the inlet and outlet of the valve, press the packing gland, and make the opening and closing parts in the partially open position;

2: Fill the body cavity with test medium, and gradually pressurize to the test pressure, the check valve should be pressurized from the inlet end;

3: After the pressure holding reaches the specified time, check whether there is leakage in the shell (including the packing and the connection between the valve body and the bonnet).

2. Shell test data table:

3. Data table of valve seal test:

Fourth: after the valve pressure test, the quality inspection department shall be requested for sampling. After passing the sampling, it will be listed for storage.

I am a professional valve design engineer! Valve pressure is simple! After the valve is closed, the inlet end is sealed and pressed by a press, which is generally carried out by pumping water, and the sealing pressure is times the nominal pressure, and the strength pressure is the multiple of the nominal pressure.

After suppression, it is generally necessary to maintain pressure for more than 15s.

Take the gate valve as an example: it has a strength test, a seal test, and an upper seal test. Strength test:

The valve is ajar open, and the test is a multiple of the nominal pressure. Upper seal: the valve is fully open, be sure to open to the top, loosen the nut of the packing, and start to press, the pressure is doubled....Look at the 598 standard!

It's detailed inside.

The standard is not the same, the test is not the same, what type of valve do you have, the domestic valve only does the pressure test, in fact, the pressure can generally be guaranteed, many of them are bad in the high and low temperature or life test.

China General Valve Pressure Test Standard: GBT13927-92

There are many pressure tests of valves, commonly used is the strength pressure test and seal pressure test, the pressure used by the general valve enterprises in the strength test is the nominal pressure of the valve * times, and the sealing pressure is times. The U.S. Standard is basically the same, but it is necessary to convert the pound scale to the nominal pressure used in China before calculating.

The strength test is times of the nominal pressure, the test time is 5min, the valve body is not broken, there is no deformation, the valve is not seepage and leakage, and the pressure gauge is not lowered to be qualified. After the strength test is qualified, the tightness test is carried out, the tightness test pressure is equal to the nominal pressure, the valve has no leakage during the test time, and the pressure gauge does not drop to be qualified.