Didtek Knife Gate Valve range in size from 2” to 24” and are available in ductile iron or stainless steel. These valves are built to our exacting standards. Our dedicated staff has many years of combined experience in building knife gate valves, and they work hard to provide only the highest quality valves possible.
Shows the location of the knife gate valve(Installed with limit switches use or only position indicator).
Strong cutting force, the surface is flat
Moulded rubber seal, without funnelled and replacement.
Strong, lightweight. For epoxy coating steel or stainless steel, Reserve a limited position switch, solenoid valve and safety protection device mounting holes
Knife gate valves are designed mainly for on-off and isolation services in systems with high content of suspended solids. Knife gate valves are especially beneficial for handling slurry in addition to viscous, corrosive and abrasive media. The valves have a minimised pressure drop in fully open position, they are easy to actuate, they have a relatively low weight and are cost-effective.
Knife gate valves are designed to work in some of the harshest environments, typically having a sharpened blade to cut through heavy liquids. They are especially useful in wastewater applications where corrosion is an important issue. So, in addition to the valve design optimised for slurry media, it is beneficial to have a knife made of acid-proof stainless steel as this makes it less susceptible to damages caused by corrosion and as a consequence it needs less frequent maintenance or even replacement.
Both the wedge type gate valves and the knife gate valves are primarily designed for on-off services where the valve is completely opened or completely closed. It is not recommended to use neither of these to regulate flow because when fluid pushes against a partially closed gate, vibration occurs, and cavitation will eventually damage the seat and the body. Also, both valve types are designed to open and close slowly in order to reduce the risk of water hammer.