Seeking advice on the selection of control valves
Thread Content
I’m encountering problems when selecting control valves. One of the control valves in question requires that, with the opening degree and the pressure before the valve remaining constant, the pressure after the valve increase from 1.6 MPa to 3.2 MPa, while the flow rate through the valve must remain unchanged. The medium involved is gas. May I ask: How can this situation be achieved?
This post was last edited by jujiangliu on 2017-4-5 11:08. The pressure before the valve, its opening degree, and flow rate remain unchanged – so why does the pressure after the valve change? Then there’s no need for a control valve.
Try changing the diameter of the valve; this is basically very difficult to do.
I also think it’s impossible to achieve, which is why I’m coming for help. :L
Other types of valves could be considered as alternatives; it’s difficult to achieve such a large pressure difference with these valves. It’s advisable to consult valve manufacturers for specific advice
Anti-scientific design? Is it still black science? If it can be done, let us know; I want to know too.
Your operating conditions have nothing to do with the control valve; it’s a problem on the side where the valve is used! The flow rate at the user end is restricted; when the control valve stays at a certain opening position, the pressure behind the valve increases, and it is easy to understand that the flow rate remains unchanged.
Do you mean that behind this control valve there is a flow-limiting device, and the flow rate of this device is a constant value?
It’s impossible to achieve this; with the valve opening remaining constant, any change in the pressure difference across the valve will definitely result in a change in flow rate.