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Valve Packing Sets
For Gate, Globe, Plug, needle, actuated, pressure relief, back pressure, steam and other packed valves.
The API recently released the 624 standard. It requires the use of API 622-tested packing. The API 624 specification requires the valve be tested for 310 mechanical cycles with three thermal cycles from ambient temperature to 500°F (260°C) with leakage not to exceed 100 parts per million (ppm) at any point. No packing re-torque is allowed for the duration of the test. Now that API 624 has been published, other API standards have added the requirement of passing 624 to the valve standard. For example, 624 must be passed for a valve to be labeled an API 600 valve.
In critical applications it is often a good idea to live load your valves.Details on live loading can be found here.
API continues to develop standards for testing valves and packing for low-emissions requirements and is currently working to develop API 641 for testing quarter-turn valves for compliance.
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