General evaluation of pneumatic valve pressure test

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shell shell tests, the pressure on the wall and pneumatic valve body and valve cover coupling place must not have visible leakage, shell ( Including the stuffing box and pneumatic valve and pneumatic valve cover coupling place) There should be no structural damage.
if there is no special regulation, allowing filler leakage under the shell test pressure, but as to test pressure seal test pressure, should be no visible leakage.
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in sealing testing no visible leakage within the test duration.
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in sealing testing the maximum allowable leakage of sealing test are shown in table. The leakage in the table applies only to emissions into the atmosphere. D is applicable to metal seal pneumatic valves. Among them: B is suitable for the more critical of pneumatic valves, D level applicable to the general pneumatic valves. The maximum allowable leakage (of all kinds of pneumatic valve Level) Should be in accordance with relevant regulations of the product standard. If the relevant standards did not make specific provision, the non-metallic elastic sealing pneumatic valve in accordance with the requirements of grade A metal seal pneumatic valve in accordance with the requirements of D.