1. Basic structure of Gate Valve
Gate valve is the most common valve in water supply or water treatment systems. It requires little space along the pipe axis and the function is relatively more simple: with a closure element sliding into the flow stream to provide shutoff and open acting as a gate, the gate valves are used to isolate specific areas of the water network during maintenance, repair works, etc.
2. Metal Seated Gate Valve
Initially, the metal seated gate valve was the only option in the market. To stop the stream, the wedge slides towards a groove in the invert of the gate valve body. With a conical wedge and angular sealing devices, the metal seated wedge requires a depression in the valve bottom to ensure a tight closure. However, this structure might cause sand and pebbles embedded in the bore and the pipe system will never be completely free from impurities. And as time goes by, these accumulated impurities will reduce the wedge’s ability to be drop-tight.
3. Resilient Seated Gate Valve
Unlike the wedge in the metal seated gate valve, the wedge in the resilient seated gate valve is encapsulated in resilient material to provide a tight seal.
With this design is no longer necessary a groove at the bottom of the valve.
The resilient seated gate valve has a plain valve bottom allowing free passage for sand and pebbles in the valve. Even though the impurities pass as the valve closes, the rubber surface of the wedge will absorb these while the valve is closed.
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