Selection of control valves
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It is known that both the pressure before and after the valve is less than 16 kilograms; therefore, a valve with a design pressure of 16 kilograms is selected for use. Is it still necessary to know the specific pressures before and after the valve?
Yes, it is necessary to provide as detailed parameters as possible for the control valve
The working pressure is less than 16 kilograms; it could also be 15.999999 kilograms. The design pressure for the valve is set at 16 kilograms – don’t you think that’s too low? Is there no fluctuation at all in this system? Saving that much money?
Control valves require upstream and downstream pressures as well as pressure difference; they also need flow rate information, specifications regarding noise level, flow speed limits, and valve structure.
No, basically the pressure is always below 10 kilograms. The teacher in charge of the process package isn’t sure about the pressure before and after the valve, so he wants to know if it’s okay to use the design pressure of 16 kilograms
Control valves are generally designed with a pressure rating one level higher; for your case, you should choose at least 2.5 MPa, or alternatively 4 MPa
One thing to keep in mind is to prevent unexpected operating conditions from occurring; for example, the water hammer pressure generated by rapid opening and closing of valves can be much higher than normal pressure