The air circuit of the control valve – why isn’t this port connected?
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For a new project, why isn’t this interface for the pressure relief valve connected? I passed by today and heard a hissing sound coming from this valve; upon checking, I found that there was a leak at the outlet of the pressure regulator, which was covered with a white plastic cap. When I touched the white plastic lid, the air pushed the white plastic away. Based on my experience, this pressure relief valve connector should be connected to the air supply pipe; could it be that the construction team forgot to do so? However, the construction team’s commissioning report states that this valve was properly commissioned. This valve was originally closed; after the white plastic was washed away, the valve opened.
This port is for the exhaust of the solenoid valve, so there’s no need to connect it. As for what you mentioned about the valve opening after the white cover was removed, it depends on whether the valve is of type FO or FC; based on what you said, it should be an FC valve
That interface is for the pressure relief valve, not for the solenoid valve
The pressure reducer should be connected, but it is still necessary to follow the valve instrument control flow diagram. For reference.
It should be connected, drawn from the main gas source. There should be a speed increase valve behind the pressure relief valve; the positioner controls this speed increase valve, and the air output from the speed increase valve feeds into the cylinder of the control valve
1. The air inlet of that pressure relief valve needs to be connected to the air supply source. 2. The booster on the valve is damaged, which causes air to flow directly from the positioner into the cylinder; there is also leakage at the plastic plug. Remove the plastic plug, and the air in the cylinder is also released from here, causing the valve to fail.
The 6th floor is the correct answer; this opening is provided for connecting to the gas supply on-site. If no gas supply is connected here, the valve cannot function. It is the gas emitted by the locator that is used as a signal to control the governor, thereby increasing the speed of movement.
There is no solenoid valve; the device that comes after the pressure reducing filter is referred to in technical terms as a start-up amplifier, and is commonly known as an accelerator.
To be honest with you, this port definitely needs to be connected to an air supply