Water Pump Control Valve

Water Pump Control Valve is an integrated hydraulic automatic valve installed at the outlet of centrifugal water pumps, combining the functions of cut-off valve, check valve and water hammer absorber into one unit. It eliminates the need to assemble multiple separate valves on pump pipelines, simplifies pump room layout, and provides full protection for water pumps, motors and piping networks during pump startup and shutdown. Operated completely by medium pressure without electricity, air sources or manual intervention, this valve is widely adopted in municipal waterworks, secondary water supply stations, fire pump rooms, industrial circulating water systems and sewage lifting projects.

The valve assembly is composed of a straight-through main valve body, diaphragm or piston drive assembly, adjustable pilot valves and matched control pressure tubes. The valve body and bonnet are cast from high-strength ductile iron, treated with full fusion bonded epoxy coating both inside and outside. The coating is non-toxic, rust-proof and resistant to weak acid and alkali, complying with sanitary standards for potable water transportation. The sealing disc is lined with high-elastic EPDM rubber to achieve bubble-tight bidirectional sealing. The streamlined full-bore flow channel reduces fluid resistance and pressure loss during pump operation, lowering pump energy consumption and improving water delivery efficiency. Diaphragm type structures are available for small and medium calibers, while piston designs serve large-diameter pipelines with strong anti-sediment performance.

Its core working mechanism realizes slow opening and two-stage slow closing to suppress destructive water hammer. When the pump starts, water pressure fills the lower driving chamber, pushing the valve disc upward. The upper chamber discharges water slowly through the slow-open pilot, so the main valve opens gradually to avoid instantaneous impact on pipelines and pump impellers. When the pump stops, inlet pressure drops rapidly. Under spring force and medium backpressure, the valve disc quickly closes most of the flow passage within a short time to block reverse water flow and prevent pump reverse rotation that may damage motor bearings. The remaining small gap closes slowly under pressure difference, releasing pipeline pressure gently to eliminate severe water hammer shock. Operators can adjust opening speed and slow-closing time via top pilot valves to match different pump power, pipeline length and medium characteristics.

This all-in-one pump control valve has obvious advantages over traditional combined valve groups. It reduces the number of pipe joints and potential leakage points, cutting material costs and construction labor. The fully hydraulic automatic linkage works synchronously with pump operation, requiring no electrical interlock devices and minimizing fault risks in humid pump rooms. The compact structure occupies much less installation space, ideal for small underground pump chambers and compact equipment rooms. Wearing parts such as rubber sealing discs, diaphragms and pilot valve components can be replaced on site without cutting pipelines, greatly shortening maintenance downtime and operation costs. No complex daily lubrication or calibration is required after installation.

Standard specifications cover DN50 to DN600 with nominal pressure PN10, PN16 and PN25, applicable medium temperature ranging from 0℃ to 80℃. It suits clean tap water, fire-fighting water, reclaimed water and low-concentration sewage. Complying with domestic and international valve testing standards, the Water Pump Control Valve is a standard safety configuration for all kinds of pump outlet pipelines. By preventing pump reverse rotation, eliminating water hammer damage, simplifying piping layout and lowering long-term operation costs, it ensures safe, stable and energy-efficient operation of the entire water delivery system.