Fisher anti-surge valve instrument air circuit
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I would like to ask everyone: with a Fisher anti-surge valve powered on, how does the instrument air flow? Also, in the event of a power loss, how does the instrument air flow?
I don’t recognize those 4 attachments above the diaphragm valve. The instrument air circuits of some valve bodies abroad are difficult to understand.
The anti-surge valve is definitely of the FO type, and it needs to open quickly; your valve should be from Arka.
Bro, this one is from Fisher.
With power supply, instrument air is supplied; the instrument air flow can be stopped, and the penalty gate can be closed； In the event of a power loss, the valve opens
First of all, this is not a Fisher valve, and the actuator is not limited to just positioners. Stall prevention is achieved in FO mode; in this simple air circuit, instrument air passes through a filter and pressure reducing valve to the single-acting actuator, and then via a quick exhaust or flow amplifier (which seems to not be from Fisher either, as it’s not clear), it reaches the actuator
Thank you, the locator is from Fisher. Actually, I’m a bit confused – shouldn’t there be a damper behind the quick-release valve? What are the two attachments behind the damper? When the accident mode is activated, the gas inside the diaphragm valve should be discharged through those two attachments behind the damper to the quick-release valve. Is that so?
Valve body and actuator: Arka; positioner: Fischer; solenoid valve: ASCO; pneumatic valve: SMC. The dark gray square control element downstream has an unknown manufacturer； When the normal solenoid valve is powered, air is delivered to the cylinder through the actuator for adjustment. When surge occurs, the solenoid valve loses power, the air-controlled valve activates, increasing the exhaust volume to achieve a rapid opening function