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SUSTAINING VALVES

Pressure Sustaining Valves (PSVs) — also known as backpressure valves — are control valves that maintain a minimum upstream pressure in a system. Unlike pressure reducing valves (which control downstream pressure), PSVs ensure that the pressure upstream of the valve does not drop below a set value.

How They Work

  • A PSV remains closed or partially open until the upstream pressure exceeds the setpoint.
  • If the upstream pressure falls below the setpoint, the valve closes to sustain pressure in that area.
  • Often pilot-operated or spring-loaded, similar to PRVs.

Applications

  1. Pump protection
    • Prevents cavitation by maintaining pressure at the pump outlet.
  2. Zoned distribution systems
    • Ensures pressure in high-priority zones (like firefighting systems).
  3. Hydraulic and gas systems
    • Maintains backpressure for operational control or stability.
  4. Water treatment and supply
    • Controls upstream tank or reservoir levels.

Key Differences: PSV vs PRV

Feature PRV (Pressure Reducing Valve) PSV (Pressure Sustaining Valve)
Controls Downstream pressure Upstream pressure
Function Reduces pressure Maintains backpressure
Opens when Downstream pressure drops Upstream pressure rises
Closes when Downstream pressure is satisfied Upstream pressure drops

Benefits

  • Protects sensitive upstream equipment.
  • Ensures stable operating conditions in pressure-critical areas.
  • Helps balance flow and pressure across complex systems.

 

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