Steam pressure control valve air circuit connection
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This post was last edited by zlm322 on 2017-6-12 at 11:32. For beginners, this air circuit is quite complex and hard to understand; I hope experts can provide some explanations
Pressure relief valve, directional control valve, pneumatic valve
I really can’t understand the piping connection of this steam pressure control valve, which operates at a relatively high pressure level
The photos aren’t very clear. There’s a pressure relief valve, an air path converter 377, a positioner; there seems to be an air storage tank as well that wasn’t captured in the photos. It looks like it’s FC
I don’t understand it either; take more photos and give it some more thought, and you’ll figure it out.
It’s an FC model; there’s a gas tank, but I can’t figure out the gas line converter
This is the FC gas circuit using a Fisher multi-functional valve. The multi-functional valve enables gas path switching; the 3 ports on the outside are connected to the output of the positioner, the upper chamber of the cylinder, and the air reservoir. The 3 on the inside are connected to the positioner outlet, the lower chamber of the cylinder, and the drain. A line runs from the outlet of the gas source pressure regulator to the control chamber of the multi-functional valve, used to detect whether the pressure in the gas circuit has reached the set value. Once the set value is reached, the valve reverses direction, connecting the upper chamber of the cylinder to the air reservoir while exhausting air from the lower chamber.
This post was last edited by jujiangliu on 2017-6-12 at 13:05. This air circuit is not complicated; once the diagram of the air circuit is drawn on site, it’s easy to analyze. Send a reference image:
You should mainly check the gas path of the 377 converter; when there is a loss of pressure, check the gas path of the gas tank at the interface below the 377
I only know that gas cylinder is used for pressure stabilization