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ASTM API600 Manual Flanged Wedge Gate Valve
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Gate Valve
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A Gate valve is a linear-motion manual valve that has a vertical rectangular or circular disc that slides across an opening to stop the flow that acts as “gate”. Generally used for isolation purposes fully open or close, Gate valves are not suitable for throttling service because the high-velocity flow will cause a partially open disk to vibrate and chatter and will hasten the erosion of the disc and seating surfaces.
Rising Stem Gate Valve with Outside Screw
The stem rises while opening and lower while closing the valve offering an indication of the gate valve position. The stem threads never contact the flow medium (not subject to corrosion/erosion).
Non-Rising Stem Gate Valve
Also known as Insider screw Valve, The stem of the non-rising stem gate valve is threaded into the gate. The hand wheel and stem move together and there is no rising and lowering of the stem. The stem is in contact with the flow medium.
Advantages of Gate valve:
1. Gate valves are adequate for high pressure and temperature applications.
2. Provide very good shutoff characteristics.
3. Low Pressure-Drop; very low frictional loss.
4. The maintenance requirement is less.
5. Can be used as Bi-directional valve.
6. Low cost.
7. available in various sizes.
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