Best Practices for Steam Control Valve Installation
Step 3: Strainer Ahead of the Valve
All steam control valves must have a strainer ahead of the valve. Steam lines frequently contain residual solid materials from the corrosion and other impurities. The strainer will filter the steam stream and prevent this material from lodging in the valve internals which would cause premature failure.
The strainer should be rated for 0.020 perforated staineless steel mesh and never be mounted with the strainer segment in a down position. Rather, install the strainer segment in a horizontal position. This will prevent condensate from accumulating in the pocket and then passing through the control valve increasing the likelihood of internal erosion and premature failure. The Strainer will have a calculated drop across the unit. The equation to determine the pressure drop: ΔPs = 91.