|DeZurik Control Valve|
Control valves are not intended for isolating a process and should not be used as such. They are not intended to provide a bubble tight shutoff.
Choose the proper body, seat and wetted materials for the process being controlled. Consider material compatibility, pressure ratings, and operating temperatures prior to valve selection.
When designing your control loop, put the flow sensor upstream of the control valve. Putting the flow sensor downstream of control valve exposes it to possible bubbles caused by the flashing and turbulence of the flow in the valve cavity.