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API - 614

API - 614

API - 614

(OP)
On API-614 (Lubrication, Shaft-Sealing, and Control-Oil Systems and Auxiliaries for Petroleum, Chemical and Gas Industry Services), item 6.4.9.5 says "Control valve(s) may be either DIRECT-ACTING or pneumatically-operated.".
1 - What is a direct-acting valve? Is is the same as a self-regulated valve?

M Assunpcao

RE: API - 614

Direct acting control valves could be the self-contained pressure regulators, temperature regulators using filled systems or lever-operated level control valves.

John

RE: API - 614

Quite a confusing quote as pneumatic valves can be direct or reverse acting.

From this quote i would say that direct acting is a valve that's hydraulic/electrical/mechanically actuated.

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