air valve
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What are the standards for testing gas valve leaks, and how can one determine whether they are valid?
First of all, you need to pay attention to posting properly – the title must be at least four characters long. Is it a gas valve for reciprocating machines? Kerosene can be used for leak testing. It is specified in the general installation guidelines; HGJ205 covers this. Last edited by fwj314159 on 2009-4-1 21:32.]
The simplest method, which may not necessarily comply with standards: place the valve flat, pour water in, and check how severe the leakage is; if the water runs out quickly, it’s time to replace it.
1. Before assembly, the ring groove of the restrictor, the spring hole, and the breathing hole beneath it should be cleaned thoroughly; the valve disc should be able to rotate freely within the ring groove. 2. After the air valve is assembled, the valve disc should be able to move up and down freely. A gas-tightness test using kerosene should be conducted, with only droplet-like leaks being allowed. 3. Before assembly, the springs should be selected such that the difference in free height among the springs of the same valve group is not more than 0.2 mm.
Our process for testing for leaks using water involves two steps: 1. Place the valve flat, fill it with water, and use a screwdriver or similar tool to check whether the valve opens smoothly. 2. Fill it with water again and wait for ten minutes to see how much leakage there is
Air valves generally leak; according to national standards, no continuous dripping leakage is considered acceptable, while the standards set by the Ministry of Chemical Industry require that there be no more than 20 drops per minute to be considered acceptable. Gas valve inspection generally uses kerosene leak testing, which is simple and cost-effective. In fact, leakage in the air valves has little impact on the operation of the compressor; compressors generally operate at 100% load, and valve leakage will only result in a slightly lower efficiency, with no significant effect.
Under normal circumstances, kerosene is used for leak testing; water is used rarely. One reason is that kerosene has better penetration properties, and the other is that water needs to be dried off afterward, otherwise rust will form
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