Back Pressure Maintaining Valves

Back Pressure Maintaining Valves

Back pressure maintaining valves, also known as Back pressure regulators, Overflow valves or simply Pressure Maintaining Valves, are used for maintaining upstream media at a set pressure.

Back pressure maintaining valves, also known as back pressure regulators, overflow valves or simply pressure maintaining valves, are used for maintaining upstream media at a set pressure. Our pressure maintaining valve ranges mirror our high pressure regulator ranges and are available as both dome loaded and spring loaded valves. They provide repeatable and accurate over pressure protection where relief valve hysteresis and endurance are insufficient. Their heavy-duty construction allows them to be used in the most arduous environments.

Dome loaded pressure maintaining valves are used in high flow applications in low to medium pressure ranges. Pressure within the dome can be controlled internally and externally, with no need for a separate pilot regulator for internal loading.

Spring loaded pressure maintaining valves can be adjusted manually and are ideal for low, medium and high pressure applications.

Our range covers port sizes from 3/8” to 3” and inlet pressures up to 1000 bar with stainless steel, aluminium and brass being the typical body materials offered.

Applications include:

  • Compressors
  • Dryer systems
  • Filter systems
  • Brewery plants
  • Gas & Liquid sampling
  • Pump Pressure control
  • Research laboratories
  • Aerospace ground support



Spring Loaded Pressure Maintaining Valves/ Spring loaded Overflow Valves

L50 Spring Loaded Pressure Maintaining Valve

Overflow valve for precise regulation of medium primary pressure, suitable for panel mounting

Port size: ISO G/NPT 3/8 female thread

Max. Inlet pressure: 400 bar

Control pressure range: 0 ... 250 bar (Aluminium body), 0 … 400bar (Stainless steel body)

Materials: Aluminium, Stainless steel

B043 Spring Loaded Pressure Maintaining Valve

Overflow valve for high level of control stability at low ranges varying between opening and closing pressure and high response sensitivity

Port size: 3/8” – 1/2” BSPP

Max. Inlet pressure: 250 bar

Control pressure range: 1.5 ... 250 bar

Material: Brass

B910 Spring Loaded Pressure Maintaining Valve

Overflow valve for high level of control stability at low ranges varying between opening and closing pressure and high response sensitivity

Port size: 3/8” BSPP, 3/8” OD SXF

Max. Inlet pressure: 700 … 1000 bar

Control pressure range: 50 ... 700 bar

Material: Stainless steel

L45 Spring Loaded Pressure Maintaining Valve

Overflow valve for precise control of medium pressure at high rates of flow

Port size: ISO G/NPT 1 female thread

Max. Inlet pressure: 70 bar

Control pressure range: 0.5 … 70 bar

Materials: Carbon steel, Stainless steel

DV903 Spring Loaded Pressure Maintaining Valve

Overflow valve for lowest rates of flow and medium pressure

Port size: 1/4” female thread

Max. Inlet pressure: 35 bar

Control pressure range: up to 35 bar

Material: Stainless steel

Dome Loaded Pressure Maintaining Valves/ Dome Overflow Valves

M31 Dome loaded Pressure Maintaining Valve

Port size: G1 female thread

Max. Inlet pressure: 70 bar

Outlet pressure: 0.5 ... 69 bar

Materials: Cast Iron, Aluminium

M32 Dome loaded Pressure Maintaining Valve

Port size: G2 female thread

Max. Inlet pressure: 70 bar

Outlet pressure: 0.5 ... 69 bar

Materials: Stainless Steel

M33 Dome loaded Pressure Maintaining Valve

Port size: G3 female thread

Max. Inlet pressure: 70 bar

Outlet pressure: 0.5 ... 42 bar

Materials: Stainless Steel

B057 Precision Dome loaded Pressure Maintaining Valve

Port size: G1 female thread

Max. Inlet pressure: 100 bar

Outlet pressure: 0.5 ... 100 bar

Materials: Aluminium

B071 Precision Dome loaded Pressure Maintaining Valve

Port size: G3 female thread

Max. Inlet pressure: 100 bar

Outlet pressure: 0.5 ... 100 bar

Materials: Stainless Steel

M51 Dome loaded Pressure Maintaining Valve for high primary pressure

Port size: G1 female thread

Max. Inlet pressure: 300 bar

Outlet pressure: 0.5 ... 300 bar

Materials: Stainless Steel

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