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The CMO C Knife Gate Valve has a single mechanically welded body that can be specified either as a square or rectangle. When open, the gate promotes unobstructed flow and material discharge.

We can supply this valve with metal or resilient seats, such as nitrile, EPDM, FPM, silicone, and PTFE which provide watertight seal. Both metal/metal and soft-seated seat combinations can be fitted with a deflector to protect the valve from abrasion and direct the flow towards the centre of the valve.

The CMO C Knife Gate Valve is suitable for solids and gravity feed applications with high solids concentrations.

Technical specifications




C series

Size range

125 x 125mm to 1400 x 1400mm (5–56”)
Contact us for bigger sizes

Pressure class

0.6 bar
Contact us for higher pressures

End connections


Actuator options

Gear operated

Material specifications


Standard: S275JR carbon steel and AISI304 or AISI316 stainless steel
On request: Stainless steel alloys (AISI 316 Ti, Duplex, 254 SMO, Uranus B6)


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

Seat and max temperature

EPDM, nitrile (90°C)
Silicone (200°C)
Viton (210°C)
PTFE (250°C)
Metal (>250°C)

How we help you choose the right valves:

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.

Talk to a valve specialist

Got questions? Need advice? Our valve specialists can give you practical advice to help you get on with the job.

Valve automation & repairs

Actuators. Positioners. Controls. Valve repairs. Whatever you need, our valve workshop can handle it.