Understanding valve structure (gate valve)1.0

1. Definition of gate valve

A gate valve is a valve that uses a gate or wedge-shaped disc that moves perpendicular to the fluid to open or stop the flow of fluid in a pipeline. Gate valves are the most commonly used valve type in all process equipment and are linear motion valves.

In use, they are either in the fully open position or in the fully closed position. When the gate valve is fully open, the valve disc of the gate valve is completely separated from the fluid and there is almost no flow resistance.

Therefore, when the fluid passes through the gate valve, the pressure will basically not drop. In order to achieve a proper seal, there needs to be 360° surface contact between the valve disc and the valve seat when the valve is fully closed. Gate valves are not used for regulation or throttling because precise control cannot be achieved. High-speed water flow in a half-open valve may cause erosion on the valve disc and valve seat surfaces and generate vibration and noise.

2. Gate valve structure

1. Handwheel nut
2. 2. Handwheel
3. 3. Stem nut
4. 4. Yoke
5. 5. Yoke bolt
6. 6. Stem
7. 7. Gland flange
8. 8. Gland
9. 9. Gland bolts and nuts Picture
10. 10. Gland lug bolts (eyebolt pin)
11. 11,14. Nut
12. 12. Stem packing
13. 13. Drain plug
14. 15. Back seat sleeve (bonnet stem sleeve) Upper sealing seat sleeve (stem sleeve)
15. 16. Bonnet
16. 17. Bonnet gasket
17. 18. Bonnet bolts, nuts
18. 19. Gate (disc, wedge)
19. 20. Renewable seat ring
20. 21. Body ตัววาล์ว
21. 
22. 22. solid wedge
23. 23. split wedge
24. 24. flexible wedge

25. teflon seat ring

26. double disc parallel seat parallel double disc

27. teflon insert in seat ring