GALLERY
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Construction of Pump Protection Valve
Typical components include:
Main Flow Path: With check valve or control disc to regulate flow.
Bypass Line: Sized to the pump’s minimum required flow.
Spring/Disc Mechanism: Automatically shifts flow between discharge and bypass.
Body: Forged or cast steel, stainless steel, or special alloys for corrosive/erosive service.
Trim: Hard-faced or stellited to resist wear and cavitation.
Key Features of Pump Protection Valve
Automatic operation – no external power or control required.
Ensures minimum flow at all times.
Prevents pump overheating and cavitation.
Check valve function – prevents backflow into the pump.
Compact design – combines several protective functions into one valve.
Available in high-pressure ratings (up to ANSI 2500 / PN 400).
Low maintenance, long service life.
Manufacture Standards of Pump Protection Valve
Pump Protection Valves are manufactured and tested according to:
API 610 (Centrifugal pumps for petroleum, petrochemical and natural gas industries – defines pump requirements, relevant to valve sizing).
API 6D / ASME B16.34 (for valve body, pressure/temperature rating).
EN 12516 (European standard for industrial valves).
MSS SP-61 (Pressure testing of valves).
ISO 9001 (quality management compliance by manufacturers).
Application of Pump Protection Valve
Power plants (boiler feedwater pumps, condensate pumps).
Petrochemical plants (process pumps, cooling circulation).
Refineries (high-pressure hydrocarbon pumps).
Desalination plants (high-pressure seawater pumps).
General industry – wherever centrifugal pumps handle critical fluids.
Operation & Maintenance Manual of Pump Protection Valve
Operation:
Fully automatic, no operator action needed.
Ensure bypass line is routed to a safe return point (tank, deaerator, etc.).
Never throttle the bypass line – must remain open to return flow.
Maintenance:
Regular Inspection – check for leaks, vibration, and abnormal noises.
Bypass Line Check – ensure no blockage or fouling.
Seat & Disc Inspection – during scheduled plant shutdowns, check for erosion/cavitation wear.
Seal Replacement – replace O-rings/gaskets if leakage occurs.
Calibration – normally factory set; adjustment only needed if flow conditions change.
Storage/Preservation – keep valve dry, ends protected with covers before installation.
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