Externally controlled valves
The robust solution for aggressive, high-purity and demanding media.
The functional principle: Decoupled, powerful and safe
In externally controlled valves, the actuator (e.g., a pilot valve) is separated from the main valve. A separate, clean control medium—usually compressed air—switches the main valve. This consistent decoupling enables the reliable control of the most demanding media, where a direct-acting solenoid actuator would reach its limits.
280
Robust
281
Design 2/2-way
Actuation type externally controlled
Nominal diameter 10.0 mm - 50.0 mm
Pressure range0.00 - 120.0 bar
KV value 2.7 - 47.2 m³/h
Housing material brass, stainless steel 1.4305, stainless steel 1.4571
Temperature medium-10 to +100°C
Connection See table
282
Design 2/2-way
Actuation type externally controlled
Nominal diameter 10.0 mm - 25.0 mm
Pressure range 0.00 - 160.0 bar
KV value 2.7 - 14.5 m³/h
Housing material brass, stainless steel 1.4305, stainless steel 1.4571
Temperature medium -10 to +100°C
Connection See table
280-X
Design 2/2-way
Actuation type externally controlled
Nominal diameter 10.0 mm - 50.0 mm
Pressure range 0.00 - 64.0 bar
KV value 2.7 - 47.2 m³/h
Housing materialBrass, Aluminium
Temperature medium -10 to +100°C
Connection G1/4, G3/8, G1/2, G3/4, G1, G1 1/4, G1 1/2, G2
281-X
Design 2/2-way
Actuation type externally controlled
Nominal diameter 10.0 mm - 50.0 mm
Pressure range 0.00 - 120.0 bar
KV value 2.7 - 47.2 m³/h
Housing materialBrass, Aluminium
Temperature medium -10 to +100°C
Connection G1/4, G3/8, G1/2, G3/4, G1, G1 1/4, G1 1/2, G2
282-X
Design 2/2-way
Actuation type externally controlled
Nominal diameter 10.0 mm - 25.0 mm
Pressure range 0.00 - 160.0 bar
KV value 2.7 - 14.5 m³/h
Housing materialBrass, Aluminium
Temperature medium -10 to +100°C
Connection G1/4, G3/8, G1/2, G3/4, G1, G1 1/4
283
Maximum pressure
Design 2/2-way
Actuation type externally controlled
Nominal diameter 15.0 mm
Pressure range 0.00 - 200.0 bar
KV-Wor t7.2 m³/h
Housing materialBrass, stainless steel 1.4305, stainless steel 1.4571
Temperature medium -10 to +100°C
Connection G3/8, G1/2, G3/4
283-X
Design 2/2-way
Actuation type externally controlled
Nominal diameter 15.0 mm
Pressure range0.00 - 200.0 bar
KV value 7.2 m³/h
Housing material brass, aluminium
Temperature medium -10 to +100°C
Connection G1/2, G3/4, G1, G1 1/4
286
extremely compact
Design 2/2-way
Actuation type externally controlled
Nominal diameter 8.0 mm
Pressure range 0.00 - 40.0 bar
KV value 1.7 m³/h
Housing material brass
Temperature medium -10 to +100°C
Connection G3/8
286-X
extremely compact
Design 2/2-way
Actuation type externally controlled
Nominal diameter 8.0 mm
Pressure range 0.00 - 40.0 bar
KV value 1.7 m³/h
Housing material brass, aluminium
Temperature medium -10 to +100°C
Connection G3/8
380
Design 3/2-way
Actuation type externally controlled
Nominal diameter 10.0 mm - 50.0 mm
Pressure range 0.00 - 64.0 bar
KV value 2.5 - 43.0 m³/h
Housing material brass, stainless steel 1.4305, stainless steel 1.4571
Temperature medium -10 to +100°C
Connection G1/4, G3/8, G1/2, G3/4, G1, G1 1/4, G1 1/2, G2
​
381
Design 3/2-way
Actuation type externally controlled
Nominal diameter 10.0 mm - 50.0 mm
Pressure range 0.00 - 100.0 bar
KV value 2.5 - 43.0 m³/h
Housing material brass, stainless steel 1.4305, stainless steel 1.4571
Temperature medium -10 to +100°C
Connection G1/4, G3/8, G1/2, G3/4, G1,
Technical details and areas of application
To help you make an informed choice, you will find an overview of the key features of externally controlled valves here.
Advantages
Media separation: The electric drive never comes into contact with the operating medium, which ensures maximum safety.
For extreme media: Ideal for highly aggressive, contaminated, abrasive or high-temperature media such as steam or hot oil.
High switching forces: By using compressed air as the control medium, even very large nominal diameters can be switched safely at high pressures.
ATEX applications: The electric pilot can be mounted in a safe area while the valve operates in potentially explosive areas.
Disadvantages
External control medium required: A separate supply line (e.g. for compressed air) must be available.
Increased system complexity: Installation requires additional components such as pilot valves and piping.
Typical applications
Chemical industry: For controlling acids, alkalis and other aggressive substances.
Steam and hot water applications: Where high temperatures make direct magnetic drive impossible.
Water treatment: For switching contaminated or chemically treated liquids.
Food & pharmaceutical industry: Where a strict separation of product and drive ensures hygiene.
Maintenance and installation:​
Separate maintenance: Pilot valve and main valve can often be maintained or replaced independently.
Control: The installation requires connection to an external control medium such as a compressed air network.
"Made for extreme conditions – externally controlled solenoid valves master even the toughest operating environments."
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