How should I understand the pressure before and after the control valve in the data table?
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How should I understand the pressure before and after the control valve in the data table? The control valve is introduced into the equipment through a pipeline connected to the pump. When the valve is open, the pressure before the valve is, for example, 0.5, while the pressure behind the valve is 0.45; fluid then flows in. But when the valve is closed, the pump stops working and the pressure before the valve drops to almost 0, yet the pressure inside the equipment rises to 0.6 MPa. So how should the pressures before and behind the valve be recorded? ?
The pressures before and after the valve are filled under operating conditions; how can 0.5 be used in front of 0.6 under those conditions?
Regulating valves have the concept of a maximum differential pressure, which is likely used to calculate the force required for designing the actuator of such valves.
Logically, it refers to the pressure under normal operating conditions; therefore, it should be 0.5/0.45
Logically, it refers to the pressure under normal operating conditions; therefore, it should be 0.5/0.45
A question: Why does the pressure of the downstream equipment increase after stopping the pump and closing the outlet control valve? As for the control valve data sheet, there are usually three sets of values for the pressure before the valve and the pressure after the valve, with each set containing these two values. These three conditions correspond to minimum flow rate, normal operating flow rate, and maximum flow rate. The values you mentioned can be filled in for both the minimum flow rate and the normal operating flow rate; you can enter 0 for the minimum flow rate. Alternatively, add a note in the data table to explain it. All of this data should be provided to the instrumentation team, as it may affect the calculation of valve types and actuators.
I still don’t understand. Could some expert please explain it? Thank you
It’s written in the previous reply; for pipeline data, it is generally 0.5/0.5 (or 0.5/backpressure)
It’s written in the previous reply; for pipeline data, it is generally 0.5/0.5 (or 0.5/backpressure)
It’s written in the previous reply; for pipeline data, it is generally 0.5/0.5 (or 0.5/backpressure)