How does this self-acting valve work?
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This post was last edited by liu530014416 on 2021-3-29 10:01. Dear teachers, regarding the control of the pressure on the side of the pressure sensing tube: currently, when the pressure is high, it remains high and won’t drop The valve looks similar to the one in the second picture; it is used to control the pressure before the valve. Was the wrong valve purchased? Do the pressure guide tube also not require valves? The joint is of the single sleeve type, and there is some air leakage; to address this, the device was shut down for repairs.
Then just adjust the spring; in my design, I would install a DN15 socket-welded valve (as per pipeline engineering standards).
It is because of the leakage in the pressure guiding pipeline that the pressure available to the actuator is lower than the actual pressure before the valve; as a result, the force exerted by the actuator on the valve element in the direction of opening the valve is insufficient, meaning the valve does not open enough and the flow rate for pressure relief is low. Consequently, the pressure before the valve remains high.
It is caused by a discrepancy between the actual pressure and the pressure measured by the valve body.
Where is the pressure to be controlled here? Is it generally the pressure taken after the valve, in order to control the pressure after reduction?
Where is the pressure to be controlled here? Is it generally the pressure taken after the valve, in order to control the pressure after reduction?
Air leakage, inaccurate measurements, spring not in place.
Bro, the internal seat of the pressure reducing valve located before the control valve is different; it’s of the bottom-opening type, while you assumed it to be of the top-opening type (most valves are of the top-opening type)
Think it over for yourself; go and ask the manufacturer.
If that’s the case, this self-acting valve cannot function properly (was it newly installed?) Has it never been normal? ).
Pressure is applied in front of the valve to adjust the compression amount of the spring; when the pressure of the medium in front of the valve on the diaphragm is greater than the force of the spring, the valve closes, and otherwise it opens