Grundfos pressure relief valves
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Manufacturer: Grundfos
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Product features
- Pressure-relief function → Protects the dosing pump and outlet-side components from excessive pressure.
- Automatic opening above the selected setting → Provides a defined response to overpressure.
- Return connection for relieved liquid → Routes discharged medium back toward the tank instead of uncontrolled release.
- Outlet-line installation near the pump → Places protection close to the pressure source.
- G 5/4 versions adjustable from 3 to 10 bar → Allows the documented valve version to be matched to system protection requirements.
- G 5/4 maximum operating pressure 10 bar → Provides a verified pressure limit for that documented version.
- G 5/4 maximum flow 460 l/h for water-like liquids → Provides a verified sizing reference for that documented version.
- Multiple body and gasket material combinations → Supports chemical-compatibility selection for different dosing media.
- Defined relief setting → Supports inspection and commissioning against documented system requirements.
- Dedicated safety accessory → Reduces reliance on the dosing pump itself to absorb blocked-line pressure events.
A pressure relief valve is required where a pressurized dosing line can be blocked or isolated and pressure could rise above the safe level for the pump or downstream components. Grundfos states that all pressurized dosing installations should include a pressure relief valve. The valve provides a defined protective path for excess pressure instead of allowing pressure to build uncontrolled in the discharge line.
Grundfos PRV valves are installed in the outlet line near the pump. When discharge pressure exceeds the selected setting, the valve opens and the side connection routes relieved liquid back toward the tank. The valve must be selected so the relief setting, connection size and wetted materials match the dosing pump, chemical and maximum allowable system pressure.
Grundfos documentation for G 5/4 pressure relief valves lists a factory setting of approximately 10 bar, adjustment from 3 to 10 bar, maximum operating pressure of 10 bar and maximum flow of 460 l/h for water-like liquids. These figures apply to that documented connection size and must not be treated as universal limits for every PRV version.
A correctly selected pressure relief valve reduces the risk of pressure-related damage to the dosing pump, tubing and outlet-side components. Its defined return path also gives maintenance teams a predictable protection function that can be inspected and tested as part of the dosing-system service plan. Correct material and pressure-setting verification helps avoid nuisance opening, inadequate protection and chemical-compatibility failures.
