Pump Pressure Sustaining Valves

  • Equilibar schematic pulse pressure control

Pressure Sustaining Valves serve the purpose of maintaining pressure in a fluid circuit by opening only as much as required to maintain the required pressure on their inlet port. The term “pressure sustaining valve” has essentially the same meaning as “back pressure valve” or “back pressure regulator”.

Pump Pressure Control

A common application for a pressure sustaining valve is shown in the schematic below. No pump can build its discharge pressure unless there is resistance on its outlet piping. A properly sized pressure sustaining valve can create just the necessary amount of resistance to accurately control pump dischage pressure

The schematic at right shows how the Equilibar back pressure valve can perform this pressure sustaining function. Typical applications include spraying or dispensing of liquids.

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Equilibar® Back Pressure Valves

Equilibar precision pressure sustaining valves are marketed as often referred to as back pressure valves or regulators. They work in a different way from traditional pressure sustaining regulators. They use a fluid pressure on the top of the diaphragm instead of a spring, and also use direct diaphragm sealing instead of a traditional valve seat. However, their lightning fast response and zero hysteresis give them a real performance advantage  over traditional pressure sustaining regulators or pressure sustaining valves.

If your application requires high precision or has very demanding conditions, the Equilibar back pressure regulator may be ideal.

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pressure sustaining valve

2″ Equilibar® precision pressure sustaining valve in Carbon Steel body. ( product details)

schematic showing pressure sustaining regulator controlling pump output pressure

Schematic showing typical pressure sustaining regulator with PID feedback control
diagram showing how a typical spring adjusted pressure sustaining valve works

Typical spring-adjusted pressure sustaining valve schematic. When fluid pressure on the diaphragm exceeds the spring force, the valve stem lifts and increases flow to achieve set-point. Pressure is controlled on the inlet port.
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