Pneumatic valve
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This post was last edited by Polar Wind on 2018-2-12 at 22:03. What kind of valve is this, what role does it play in the valve’s pneumatic control system, and how does the air flow work? Is it locked after losing the air supply? Thank you! I also wish everyone a happy New Year in advance!
Position maintaining valve, with three channels: a pneumatic signal channel, and inlet and outlet for instrument air.
This post was last edited and locked by jujiangliu on 2018-2-13 07:39. The lock valve (positioning valve) cuts off the air supply to the diaphragm of the control valve in case of a problem with the air source, thereby keeping the valve position unchanged.
The locator also has a fault hold function
It’s just a pneumatic retention valve; you can look up its functions on Baidu. A pneumatic retention valve is also known as a pneumatic locking valve. A device that detects pressure in a timely manner and can automatically shut off the channel when the gas supply pressure is below the set pressure. When the compressed air supply fails and stops delivering air, a retaining valve is used to shut off the valve control channel, keeping the valve in its position before the air supply was interrupted. To ensure the normal progress of the process, until the accident in the system is resolved and gas supply is restored, the level control valve will not open its passage and will continue to maintain normal control.
What is the situation with the exhaust gas coming from the two upper exhaust ports of the pressure maintaining valve?
What is the situation with the exhaust gas coming from the two upper exhaust ports of the pressure maintaining valve?
This post was last edited by liangjian2 on 2018-2-13 at 16:06. The interface that leads from the tee after the filter pressure reducing valve to the hold valve corresponds to the control air circuit of the hold valve. When the air supply is functioning properly, the air path from the output of the controller to the diaphragm head remains unobstructed, and the magnitude of the controller’s output determines the degree to which the valve opens. If there is a problem with the air supply, the air path from the controller to the diaphragm head is severed, keeping the valve in its current position. The small hole at the very top of the pressure holding valve is what we call a breathing hole; it facilitates the movement of the diaphragm in the pressure holding valve.
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