【Daily Question】In-depth Processing 20160828 Short Answer Question: What does a center-opening valve in a control valve mean?
Thread Content
To increase popularity and foster technical exchanges among sea enthusiasts, 【One Question per Day】 is hereby launched. Participation earns 4 points of wealth! 10 wealth points as a reward for correct answers or in-depth discussions! :Lol short answer question: What does a normally open valve mean in control valves? A wind-operated valve is one that opens when there is wind and closes when there is no wind. ======================================= ☛“Petrochemical Special Zone”’s announcement regarding the selection and rewards for outstanding moderators, technicians, and top members from January to July 2016: http://bbs.hcbbs.com/thread-1608031-1-1.html (Source: Haichuan Chemical Forum) ☛ The second round of selection for outstanding management members at Haichuan – taking place in August and September; the grand prize is a Xiaomi tablet: http://bbs.hcbbs.com/thread-1609580-1-1.html (Source: Haichuan Chemical Forum)
As the name implies, it can be opened only when there is instrument air pressure; in the event of a fault or a shutdown mechanism being activated, the air pressure is lost and the valve remains closed
The valve opens when a pneumatic signal (control air) is supplied, and it closes in the absence of such a signal; it is a pneumatically operated valve； The valve opens in the absence of a pneumatic signal (control air), and it closes when the pneumatic signal (control air) is applied; it is a pneumatically operated shut-off valve ；
Mnemonic for control valves: Valve opens with air flow; it opens when there is air and closes when there is none. Air shut-off valve: closes when there is air, opens when there is no air.
It’s a pneumatic valve, a valve that uses compressed air to operate
The wind opening valve gradually opens as the signal pressure increases; it remains closed when there is no wind
Some instrument air valves are open, while no instrument air valves are closed
Regulating valve fully closed after wind stoppage
In the absence of instrument air, the valve will automatically remain in the open position
It’s a pressure-controlled valve that opens automatically when there is pressure, and closes automatically when there is no pressure source.