Pump Pressure Sustaining Valves | Equilibar Control Products

Pump Pressure Sustaining Valves

Back pressure regulators for maintaining pump pressure

  • 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”.

A typical spring-adjusted pressure sustaining valve is shown in the sketch at right. 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.

Pump Pressure Control

A common application for a pressure sustaining valve is in a re-circulation loop with a pump. 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 discharge 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.

Application Spotlight: Chiller Loop or Cooling Loop

Glycol chiller cooling loops are used frequently in brewing or fermentation chambers and chemical manufacturing plants to control process temperature inside a reactor or tank. Oftentimes the process temperature during production is a delicate parameter that needs to be kept within a strict operating window. In order to keep that temperature in control, the flow and pressure of the cooling liquid through the chiller loop needs to be accurate.

An Equilibar back pressure regulator (BPR) can be used to control pressure of the chiller fluid loop, keeping process temperatures at the required setpoint. Using the same principle as the pressure sustaining valve above, the Equilibar BPR can be positioned in the recirculating cooling loop to provide stable chiller supply pressure during changes in demand from the manufacturing process.

diagram showing how a typical spring adjusted pressure sustaining valve works

Typical spring-adjusted pressure sustaining valve

schematic showing pressure sustaining regulator controlling pump output pressure
Schematic showing an Equilibar back pressure regulator in a re-circulating fluid loop controlling the pump pressure. Frequently used to control fluid spraying, fluid dispensing and chiller loop applications.

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Equilibar® Back Pressure Valves

Equilibar precision pressure sustaining valves are 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 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 back pressure valve in Stainless Steel body.

How Equilibar Back Pressure Regulator Works

Watch the video below of how the Equilibar Back Pressure Regulator works.

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Equilibar News
flow control june 2020

Flow Control Magazine features oil well injection using Equilibar valves to improve performance

An exciting case study featuring oil well injection in the Bakken Basin of North Dakota was published in the June 2020 issue of Flow Control Magazine.  Co-authored by Diane Jacober of Equilibar and Christopher Duffield of Intermountain Electronics , the article explains how direct-sealing diaphragm valves offer practical advantages for difficult flow control applications, especially Read More

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