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Hazardous Area Intrinsically Safe Pneumatic Solenoid Friction-Free Valves

Hazardous Area Pneumatic Solenoid Friction-Free Valves. Good for 100 million operating cyclesFriction Free Valves

Common applications for Expo’s friction-free valves include:

  • Infrequently operated valves: as valve doesn’t stick;
  • Emergency shutdown systems – when the valve “must work”;
  • High frequency cycling: fast response due to low inertia;
  • Long control loops: due to low current required to drive the valve;

Intrinsically Safe Pneumatic  Solenoid Valves 

These valves are intrinsically safe. These valves cannot ignite a flammable atmosphere, by a spark or hot surface.

The valves are intrinsically safe, because they  consume so little electrical power either during operation or under fault conditions, and are certified to:

  • Certified FM/USA Class I Div 1, Groups A, B, C, D – dependent on barriers used;
  • ATEX to EN 50020 II 1 GD EEx ia IIC T6;
  • ATEX to EN 50021. II 3G EEx na IIC T6 or T4;
  • PTB to VDE 0171 Ex is (Zone 1 & 2) G4, G5.

Why Expo’s Valves are friction-free, low inertia, low current and don’t stick

Expo’s friction free valves contain large-area, suspended poppets. The movement is small. Hence our valves are friction-free, consume little power and deliver high reliability. Our friction free valves comprise three sections:

  1. Electrical: Solenoid Operation Cap and Connector;
  2. Pneumatic: Valve module section;
  3. Pneumatic Connection Block: Port block or manifold.

Benefits of Intrinsically-Safe Pneumatic Solenoid Friction-Free Valves

Friction Free Valves: Applications include Emergency shut-down when valve must operate, High frequency cycling due to 70ms response time, infrequently operated valves, due to low maintenance requirements ATEX Friction Free Valve Manifold

Freedom from sticking: >100 million cycles, under standard conditions:

  • Equates to 1 cycle/minute until the year 2200;
  • Highly reliable;
  • Lower maintenance costs.

Low- power consumption: due to friction-free design:

  • 0.15 – 0.4 Watts power consumption at 14-24 volts nominal voltage;
  • 1.3 Watts power consumption at 110v;
  • 2.4 Watts power consumption at 220/240 volts.

Fast, positive equipment control:  

  • 3 port 2 position typically operates within 70ms;
  • 4 port 2 position typically operates with 100ms.

Easy, Fast Installation:

  •  NAMUR adapter plates as standard.

Drive up to 4 solenoids

  • Use only one I.S. (intrinsically safe) interface.

AC or DC operation.

  • Built-in bridge rectifier;
  • Zero back e.m.f spikes.

 Options for Hazardous Area Pneumatic Solenoid Friction-Free Valve

Indicators: Easier plant set-up, as indicators “prove” circuit.  Superior plant control, as visual indicator on sequential plant control.

  • Manual “latch on” indicator;
  • LED energized indicators.

Manual reset: Require operator reset after valve “trip”. Reset located on:

  • Valve;
  • Remotely piped.

Common Pneumatic Valve Functions, handle a wide range of inlet pressures:

  • 2 port 2 position normally closed: Range 2-9 bar
  • 3 port 2 position normally closed: Range 2-9 bar.
  • 3 port 2 position normally open: Range 4-7 bar
  • 4 port 2 position: Range 4-7 bar.
  • 4 port 3 position: Range 2-7 bar.
  • Double 3 port 2 position in one valve module: Range 4-7 bar


  • Manual “latch on”;
  • LED energized.

Low Temperature operation:

  • Standard: -10ºC to +65 ºC, +14ºF to +150ºF;
  • Low Temperature: -20ºC to +65º C,4ºF to 150ºF.

Pilot supply and low pressure valves.

Manifolds: All common exhaust and supply options.

Integrated stop-valve

Specifications for Hazardous Area Pneumatic Solenoid Friction-Free Valves

Flow Capacity

  • 4 bar inlet pressure, unrestricted outlet: 821 litres/min, 29 scfm;
  • 6 bar inlet pressure, unrestricted outlet: 1175 litres/min, 41.5 scfm.

Air quality: Expo’s friction-free, intrinsically safe valves do not require high quality compressed air. They just require:

  • Filtration better than 50 micron particle size.
  • Dew point below expected ambient temperature.
  • Lubricated air not required, but not detrimental.


Hazardous Area Pneumatic Solenoid Friction-Free Valve.


Intrinsically Safe Friction Pneumatic Solenoid Friction Free Valve Manual


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  • North America contact Matthew Dudones;
  • Rest of World contact Mike O’Neill.
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