Is a check valve necessary after the control valve? If so what type is typically used? I was considering a swing check because it has low air flow restriction but has to be mounted horizontally and ta

What is the best way to design the piping manifold so the flow to each bundle shall be as equal as possible by symmetrical piping only (the operating conditions are 80 deg C and 2 barg).

Best solution would be to buy a valve with an anti-cavitation trim.There is a fundamental problem with using anticavitation valves on raw water, which is this application.

The butterfly valve disc always has an angle when it is seating on the seat. It is impossible to make valve disc zeron degree alignment on the seat.

The standard way to calculate dynamic torque is to run a flow test and measure the torque required to rotate the valve at each position.

I recommend you download a vendor program . Use the FL and Xt factors for your particular make of butterfly valve and you can calculate the valve openings for different flowrates.

Butterfly valves are often used for throttling down of water lines, but I wouldn't use one on a sewage force main.

A Fisher control valve and on the front of the actuator is a table listing "initial spring settings (PSI)" for various valve configurations. What does this mean? Does this mean that the actuator spri