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Grundfos backpressure valves

Grundfos backpressure valves maintain a defined counterpressure on the discharge side of dosing pumps where system resistance is too low or unstable. They support stable dosing conditions and can also help prevent siphoning when inlet pressure is higher than the counterpressure. AxFlow can help confirm pressure setting, size and materials. Request a quote for Grundfos backpressure valves from AxFlow.
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Key product features

  • Constant counterpressure function → Stabilizes dosing hydraulics when downstream resistance is too low.
  • Adjustable pressure setting → Allows the valve to be matched to the required dosing-pump backpressure.
  • Use with fluctuating downstream pressure → Helps maintain more consistent hydraulic conditions for dosing.
  • Anti-siphoning application → Helps prevent uncontrolled flow when inlet pressure exceeds counterpressure.
  • Outlet-line installation → Places the control function directly in the dosing discharge line.
  • G 5/4 versions adjustable from 3 to 10 bar → Provides a verified setting range for medium-sized documented versions.
  • G 5/4 maximum flow 460 l/h for water-like liquids → Provides a verified sizing reference for those versions.
  • G 2 versions adjustable from 0.5 to 10 bar → Provides a wider low-end setting range for larger documented versions.
  • G 2 maximum flow 1500 l/h for water-like liquids → Provides a verified sizing reference for larger documented versions.
  • Maximum operating pressure 10 bar in documented PLV groups → Provides a clear verified pressure limit for selection.

Product Description

A backpressure valve is relevant when a dosing pump discharges into a system with too little resistance, fluctuating pressure or a risk of siphoning. Grundfos states that pressure loading valves maintain constant counterpressure and are used in these conditions to stabilize dosing hydraulics. The valve is installed in the outlet line and should not be used as a shut-off valve.

Grundfos PLV valves create an adjustable hydraulic resistance in the discharge line so the dosing pump operates against a defined minimum counterpressure. This is useful where process pressure is too low or varies with an outlet-side pulsation damper, and where siphoning must be prevented because inlet pressure exceeds counterpressure. The selected version must match flow, connection size, pressure setting and chemical compatibility.

Grundfos documents PLV versions with different connection sizes. G 5/4 versions are factory-set to approximately 3 bar, adjustable from 3 to 10 bar and rated up to 460 l/h for water-like liquids; G 2 versions are adjustable from 0.5 to 10 bar and rated up to 1500 l/h. Both documented groups list maximum operating pressure of 10 bar, so the correct version must be selected by duty.

Maintaining stable counterpressure can reduce dosing variation caused by changing downstream hydraulic conditions and can prevent uncontrolled siphoning in relevant installations. A dedicated adjustable valve also gives maintenance teams a clear component to inspect when dosing accuracy changes. Correct sizing is important because excessive backpressure can overload the pump, while insufficient setting may not stabilize the process.

The Grundfos backpressure valves range is used for maintaining a defined counterpressure for accurate dosing where downstream resistance is too low, fluctuating or at risk of siphoning. It is relevant where the verified construction and operating range match the process duty. AxFlow can help confirm whether the selected configuration fits the application.
Selection should verify required minimum counterpressure, dosing flow, normal system pressure, siphoning risk, connection size, chemical compatibility and maximum pump discharge pressure. Published limits apply to specific sizes and configurations rather than every variant. The final choice should therefore be checked against the selected Grundfos product data.
Grundfos backpressure valves is distinguished by its dedicated function of maintaining constant adjustable counterpressure in the dosing discharge line. This defines how the product performs its intended role in the system. The practical benefit depends on matching the configuration to the actual process conditions.
Start with the required process duty and the liquid or chemical to be handled. Then confirm required minimum counterpressure, dosing flow, normal system pressure, siphoning risk, connection size, chemical compatibility and maximum pump discharge pressure. AxFlow can support product selection and availability checks for the identified configuration.
AxFlow can support product identification, service planning and spare-parts selection for compatible Grundfos equipment. Exact parts and service intervals depend on the installed model, materials and operating conditions. Provide the pump or accessory identification when requesting support.
SIA AxFlow
Phone: +37167553750

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