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The CMO GC Damper contains a gate which moves longitudinally and a peripheral sealing system that stops gas leakage at any point during the gate’s movement. Its thick, mechanically welded carbon steel or stainless steel body is reinforced to maintain structural integrity. A screwed-down cover seals the upper section of the body, creating a hermetic interior chamber.

For even greater seal-tightness, wedges are welded on the inside of the body to push the gate against the seal. The standard seal-tightness of 98.5–99.5% can be increased to 100% with special modifications using a dual gate system and air injection.

The damper allows continuous flow with minimal load loss when open. It’s also resistant to high temperatures and deterioration.

The CMO GC Damper is used to isolate a wide range of air and gases and allow pipeline inspection, maintenance, and repair.

Technical specifications




GC series

Size range

150 x 150mm to 3000 x 3000mm (6–120”)
Contact us for bigger sizes

Pressure class

5 bar

End connections


Actuator options

Gear operated

Material specifications


Standard: S275JR carbon steel
On request: HII steel, 16Mo3, and stainless steel (AISI304, AISI316, AISI310)


Standard: AISI 304 and 316 stainless steel
Contact us for other materials, coatings, and finishes

Seat and max temperature

Natural rubber, EPDM, nitrile (90°C)
Silicone and Viton (200°C)
PTFE (250°C)
Metal (>250°C)

Packing and max temperature

Greased cotton and dry cotton (100°C)
Cotton and PTFE (120°C)
Synthetic and PTFE (-200°C/+270°C)
Graphite (>270°C )
Ceramic fibre (>270°C )

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1. Tell us what you need

Talk to our experts about your application, which valves and controls you need, and any repair or maintenance concerns.

2. Choose the right solution

We’ll do all the analysis, discuss the options with you, and make a recommendation—the valves we’d choose in your shoes.

3. Get the job done

Get the right valves for the job, fitted out, tested, and ready to install. We’ve got your back with ongoing repairs and maintenance.

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