Knife Edge Gate Valve Manufacturer in India
A Comprehensive Guide to Knife Edge Gate Valve Manufacturers in India.
What is a Knife Edge Gate Valve?
A knife edge gate valve controls the flow of fluids. It has a gate that moves perpendicular to the flow direction, resulting in a tight seal between the gate and valve body. The gate has a sharp edge, hence the term “knife edge.” This design provides a leak-tight closure, making it ideal for applications that require precise leak control and prevention.
Design and components of a knife gate valve
Knife gate valves are a type of isolation valve that is commonly used with non-hazardous media, such as wastewater. A knife gate valve’s bore is full and smooth, allowing it to be maintained with a cleaning pig. While there is no pressure loss across the valve, they are prone to “chatter” or vibration when opening or closing due to fluid flow against the gate. This is not a major issue because the proper application for a knife gate valve is isolation, not flow restriction, so the normal operating position is fully open or fully closed. A spindle or rising screw raises and lowers a thin (typically) stainless-steel gate into the bore, which, unlike other gate valves, lifts outside of the valve body when raised. The guide and seal are located around the bore’s circumference, ensuring a bidirectional, bubble-tight seal.
Knife gate valves can have bodies made of cast iron, cast steel, stainless steel, fabricated steel, or exotic alloys, depending on the application. While the gate is typically made of stainless steel, the yoke can be made of materials similar to the valve bodies, including a brass or bronze bearing. Seat seals can be made of either elastomers or flexible metal. Use the diagrams below to identify the various parts that are common. Bore sizes ranging from DN 50 to DN 600 are common, with knife valve dimensions of DN 1000+ also available.
Working Theory of Knife Gate Valves
All valves are intended to limit or stop the movement of a liquid in a flow stream, but the designs and applications vary depending on the use case. As a result, the construction of a gate valve differs slightly from that of a knife gate valve. In a typical wedge gate valve, as the name implies, the wedge acts as a “gate” to move into the flow stream and seal off or reduce flow by impeding its path. A knife gate valve is a type of valve that uses a knife edge to enter the flow stream and, if necessary, separate any materials that may prevent the valve from completely sealing.
As previously stated, 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 position of the gate indicates whether the valve is open or closed; if it is visible above the valve body, it is open, and if it is not visible, it is closed.
Benefits of Knife Gate Valve
Many of the benefits of regular gate valves also apply to knife gate valves: they are simple to operate mechanically, electrically, or pneumatically, and they are lightweight, making them easier to transport, store, install, and maintain. They are also very economical. Because of these characteristics, knife gate valves have seen extensive use in applications involving slurry, viscous fluids, and other applications where impingement is an issue, including pulp and paper production, municipal wastewater pumping stations, and sewage treatment plants. primarily manufactures valves and fittings for municipal water supply and sewage, but our knife gate valves are also suitable for other non-volatile, non-flammable viscous fluids.
Types and applications of knife gate valves
The company manufactures high-quality knife gate valves for a variety of municipal applications. Hawle offers four knife gate valve models based on the application