Seeking advice on the pressure issue downstream of a self-acting pressure control valve
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I’m a beginner when it comes to valves. I would like to ask about the self-acting pressure control valve of the ZZYP type, which is designed for pressure reduction and stabilization after the valve. If the pressure behind the valve is set to 5 kilograms, and there is no load on the system downstream of the valve, it means that pressure builds up behind the valve. In such a situation, what will be the operating state of the self-acting pressure control valve? Is the pressure behind the valve continuing to rise? Does it continue to have a pressure-relieving effect until the valve is closed and cut off?
It will gradually shut down, and eventually stop functioning.
In fact, its principle is similar to that of a pressure relief valve or a safety valve. Only one pressure signal is involved in the control. By comparing the differences in pressure across the valve, it automatically controls a certain degree of opening. If the pressure continues to rise, it indicates that there is a leak inside the valve. To prevent such things from happening, self-acting control valves are usually assembled into valve assemblies. These include the need to install shut-off valves before and after the valve, connecting valves, and pressure gauges during maintenance. It is also recommended to install a safety valve after the shut-off valve at the valve outlet, in order to prevent overpressure incidents caused by valve leaks.
It was previously believed that a pressure difference between the front and back still existed, so the pressure relief valve could still maintain its pressure-reducing function. However, when calculating the pressure relief valve, it is found that the pressure downstream of the valve is based on the operating conditions under normal use; this pressure is different when the valve is closed. A safety valve is installed downstream of the on-site pressure reducing valve in the unit; generally, if the valve upstream of the pressure reducing valve is not closed first and instead the valve downstream is closed first, the safety valve will activate.
Thank you to all the experts for their answers; thanks
Self-acting pressure relief valves are usually part of valve assemblies, and pressure gauges and safety valves are installed downstream of the valve. When the pressure downstream of the valve exceeds a certain level, the safety valve will activate once it reaches its set pressure, thereby preventing accidents
The answer is very correct. First, as the pressure behind the valve increases, the valve opening decreases until it closes. Secondly, there should be a pressure gauge and a safety valve behind the valve.
The valve will close and will not open until the pressure drops below the set value
It will gradually increase and then shut off; the pressure at this point is called the shutdown pressure, and it is higher than 5 kilograms. The exact amount by which it is higher depends on the design of your product.