What is this control valve?
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What kind of control valve is this? How should these four pipes be connected – to the pipeline before the valve or to the pipeline after the valve?
This post was last edited by ylb913 on 2018-8-12 at 17:34. In fact, this control valve isn’t anything special in essence; it’s just an air shut-off valve (currently in the fully open position). The wind-on and wind-off valves that we usually refer to actually have springs inside their diaphragm heads or cylinders in the vast majority of cases. This is a cylinder valve; it’s just that the spring-loaded part is placed outside the cylinder. Many of the self-regulating valves seen on site are like this. Regarding the issue of four wires: there is only one air inlet on the cylinder. If the length is sufficient, one wire is enough; if not, multiple wires need to be connected together (all using the same male and female connectors).
I’ve studied it, but I’ve never seen a valve like this before.
This is a self-acting control valve; the pipe attached to it is a sampling pipe, which is installed on the connecting pipeline. It is possible to choose between stabilizing the pressure before the valve or the pressure after the valve
1. This is a self-acting control valve； 2. These four pipes are used to connect the air inlet of the diaphragm head to the pressure tapping points on the pipeline, which are connected to the pipeline behind the valve.
Self-acting control valve, with copper pressure guiding tubes.