Knife Gate Valves

Knife Gate Valves provide reliable and long life on a variety of tough applications including corrosive and abrasive services. Key aspects like operating loads, ease of operation, service conditions etc. are considered in its design and construction to ensure long maintenance free service life. Through continuous process improvement our products are competitive enough to meet global requirements. Expert Knife Gate Valves are designed for isolation, on-off and throttling applications.

A knife gate valve is a specific design of a valve that uses a knife edge that can enter the flow stream and, if necessary, use the edge of the gate to separate any materials that might prevent the valve from sealing completely. As described above, the knife gate can be raised using a spindle or a rising screw and the actuating mechanism can be manual or pneumatic/electrically activated. The open/closed state of the valve can be observed from the position of the gate – if it is visible above the valve body then it is open and likewise, if it is not visible then the valve is closed.

Optional Accessories

Deflector Cone

Deflector cone is provided on the inlet of the valve for critical service application where abrasion is high. The Deflector cone is normally of Ni-hard material and protects the valve body. It is installed between the valve and the pipe flanges and diverts the abrasive material flow to the valve. The typical application involve Bin bottom, for dry solids, mining slurries, fly-ash, bag-filter, cyclone bottom.

Purge Connection

The purge connections are used to flush the seat area and minimize the chance of material getting clogged on the seat, thus helping smooth operation of the gate. Purge connections are located at 5 and 7 ‘O’ clock positions on 6″ and smaller size valves and at 3,5,7 and 9 ‘O’ clock positions on 8″ and larger size valves. The purge connection can also be provided in the chest area and is normally furnished with pipe plugs and are used only for flushing if required.

Fail Safe System

The valve components can be offered with protective coatings / surface treatment typically hard facing of seat areas (Stelliting / Nitriding of body, seat and gate edge) is done, depending on the application to increase the life expectancy.