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Test requirements for valve pressure testing bench
1、 Preface
Valve pressure testing station is generally a pressure testing method for industrial metal valves to test air pressure or liquid pressure. It is a new type of valve pressure testing device designed with reference to national standard documents
2、 Classification
General testing is divided into three categories: air pressure testing, air tightness testing, and water pressure strength testing.
All valve pressures refer to the pressure inside the valve chamber
3、 Location
The test location is specified in the national standard to undergo pressure testing at the valve manufacturer.
4、 Requirement
For those with strict requirements, the test needs to be conducted at a certain temperature. Unless otherwise specified, the pressure test is generally conducted at 5 ℃ -40 ℃.
Valve pressure testing devices generally should not have any requirements for damage to the valve, and are usually tested by external tightening without affecting the pressure testing of the valve
The test medium requires liquid or liquid for pressure testing. Generally, liquid is used as the test medium for sealing testing or high-pressure strength testing, such as emulsion, water, etc. Gas pressure testing generally uses inert gases such as air, nitrogen, argon, etc.
5、 Pressure
For shell pressure testing, the medium is liquid, and the test pressure is generally at least 1.5 times the working pressure. When testing with gas as the medium, the pressure test should be at least 1.1 times the working pressure of the valve.
Regarding the upper sealing test: seal the inlet and outlet of the valve, fill the internal shell of the valve with liquid, exhaust the internal air, pressurize to at least 1.1 times the working pressure, maintain pressure, and observe the condition of the valve packing.
When conducting liquid testing, it is necessary to fill the interior of the shell with water in advance before conducting liquid pressure testing. Only after passing the liquid pressure test can the air pressure test be carried out, and certain protective measures need to be taken for the air pressure test.
6、 Time
Valve nominal size | Maintain the duration of the test pressure | ||||
Shell Test | Upper Seal Test | Sealing Test | |||
Other types of valves | Check valve | ||||
≤DN50 | 15 | 15 | 60 | 15 | |
DN65-DN150 | 60 | 60 | 60 | 60 | |
DN200-DN300 | 120 | 60 | 60 | 120 | |
≥DN300 | 300 | 60 | 120 | 120 | |
*Maintaining the test pressure is a relatively short duration, which refers to the relatively short time that the test medium pressure inside the valve is maintained after it reaches the specified value. | |||||
7、 Reference standards
The test requirements for valve pressure testing bench need to refer to GB/T 13927-2008
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