Back Pressure Valves / Relief Valves for Motor-Driven Metering Pumps

Back Pressure Valve / Relief Valve for High-Pressure Systems

For use as an adjustable safety relief valve and as a back pressure valve. Relief valve and corresponding spring must be ordered separately

Use as a pressure relief valve (adjustable) and as a back pressure valve. Overflow valve and corresponding spring must be ordered separately.

Material: stainless steel 316/FKM

Temperature range: -18 °C to 120 °C

Recommended Use up to 200 l/h

Recommended Use up to 300 l/h

Reducing Pipe Nipple

Back Pressure Valve / Relief Valve Type DHV 712-R

Plunger diaphragm valve with internal approach flow and no back pressure effect.

• To generate constant back pressure
• for precise pumping and to protect against over-metering where there is a free outlet or fluctuating back pressure or when metering into a vacuum.

Also used in conjunction with pulsation dampers to generate low-pulsation metering.

Please note: Back pressure valves cannot be used as absolutely leak-tight shut-off devices. It is essential that you observe the installation notes in the operating instructions. Take appropriate precautions when handling hazardous media.

Important: When used as a relief valve in conjunction with sticky media (e.g. lime milk), appropriate safety precautions should be taken (e.g. flushing after a response).

Applications of PPE / PCB

20 °C - max. operating pressure 10 bar

Applications of PVT / TT / SS

30 °C - max. operating pressure 10 bar

* Caution: The product contains adhesive joints with Tangit. Please note the resistance of Tangit adhesive.

Dimensions of DHV 712-R

*= Approx. values;

** = PP, PVC, PVDF;

*** = TT, SS

Materials

Back Pressure Valve / Relief Valve Type DHV-U in physiologically safe design (FDA)

Back pressure valves for motor-driven metering pumps are designed for different applications. Please refer to the relevant notes for the different designs.

Relief valves are used in the bypass to protect pumps, pipes and fittings from overpressure in the event of incorrect operation or blockages. In the event of a malfunction, the pump pumps back into the storage tank.

Application of PPE/PPB/PCE/PCB

20 °C - max. operating pressure 10 bar

Application of PVT/SST

30 °C - max. operating pressure 10 bar

Materials

* Cover ring made of PTFE/FKM

All wetted materials in the "Physiologically safe (FDA) in respect of wetted materials" design comply with the following FDA guidelines:

We are happy to supply back pressure valves and relief valves DHV-U/DHV-UR in stainless steel and wetted EC 1935/2004 on request.

Dimensions of DHV-U (FDA) (PP, PVC, PVDF design)

Dimensions of DHV-U (FDA) (SS design)

Back Pressure Valve / Relief Valve Type DHV-U

Plunger diaphragm valve with internal approach flow and no back pressure effect.

• To generate constant back pressure and
• as a relief valve.

Can be installed at any location in the pipework system.

Please note: Back pressure valves cannot be used as absolutely leak-tight shut-off devices. It is essential that you observe the installation notes in the operating instructions. Take appropriate precautions when handling hazardous media.

Important: When used as a relief valve in conjunction with sticky media (e.g. lime milk), appropriate safety precautions should be taken (e.g. flushing after a response).

Application of PPE/PPB/PCE/PCB:

20 °C - max. operating pressure 10 bar

Application of PVT/SST:

30 °C - max. operating pressure 10 bar

Materials

* Cover ring made of PTFE/FKM

Dimensions of DHV-U (PP, PVC, PVDF design)

Dimensions of DHV-U (SS version)

Relief valve type DHV-UR M configured for manometer

The relief valves DHV-UR with M designs are configured with a plug for manometer installation. Manometer with threaded socket G 1/4“ (ISO 228) can be fitted by the customer directly to the relief valve via the additional housing opening. Standard manometers with part number are available for neutral media. This also enables savings in terms of installation.

Application of PPE/PPB/PCE/PCB:

20 °C - max. operating pressure 10 bar

Application of PVT/SST:

30 °C - max. operating pressure 10 bar

Materials used

* Cover ring made of PTFE/FKM

Dimensions of DHV-UR M (PP, PVC, PVDF design)

Relief valve type DHV-UR, FDA design

Back pressure valves for motor-driven metering pumps are designed for different applications. Please refer to the relevant notes for the different designs.

Relief valves are used in the bypass to protect pumps, pipes and fittings from overpressure in the event of incorrect operation or blockages. In the event of a malfunction, the pump pumps back into the storage tank.

Application of PPE/PPB/PCE/PCB

20 °C - max. operating pressure 10 bar

Application of PVT/SST

30 °C - max. operating pressure 10 bar

Materials used

* Cover ring made of PTFE/FKM

All wetted materials in the "Physiologically safe (FDA) in respect of wetted materials" design comply with the following FDA guidelines:

Dimensions of DHV-UR (FDA) (PP, PVC, PVDF design)

Dimensions of DHV-UR (FDA) (SS design)

We are happy to supply back pressure valves and relief valves DHV-U/DHV-UR in stainless steel and wetted EC 1935/2004 on request.

Relief valve type DHV-UR

The universal relief valves type DHV-UR, like all valves of the DHV-U product range, are infinitely adjustable piston diaphragm valves with internal flow. In the event of impermissible overpressure, the internal piston diaphragm opens the second outlet line, the relief outlet. It can be installed at any location in the pipework system. Very low pressure losses with a closed relief valve due to virtually free pipe cross-section Simple spare parts management, the wear parts (pressure spring, diaphragms, plunger seal, seal connection set) correspond to the DHV-U range of valves.

The benefits of the new relief valves DHV-UR include simpler assembly due to the saving of installation material/connection parts etc. and a reduction of adhesion points. The new installation method permits a slimmer design of metering stations.

Materials used

* Cover ring made of PTFE/FKM

Dimensions of DHV-UR (PP, PVC, PVDF design)

Dimensions of DHV-UR (SS design)