Sanitary valve troubleshooting guide

Sanitary valve troubleshooting:
Erratic Control
• Oversizing causes cycling or hunting –recalculate size required
• Check operation of steam traps and or relief Sanitary valves down stream
• Check that Sanitary valve moves freely over its entire stroke.
• Check inlet pressure does not droop excessively under load
Insufficient flow
• Ensure isolation Sanitary valves are open fully
• Check upstream pressure
• Blow down strainers
• Check control valve opens fully. Could be insufficient signal pressure of diaphragm problem
Sanitary Valve Passing
• Check actuator preload adjustment
• Check for foreign matter in seat
• Check for seat/plug damage