Gate Valves
Available in Single Disc and Double Disc. Used for the isolation of gases, especially in coke oven gas lines
where tar content is very high. Ideal valve for isolation of highly toxic gas lines and gases with tar
content.
TECHNICAL DESCRIPTION:
The valve mainly consists of the body, bonnet, disc, stuffing box, stem, superstructure, and drive
mechanism. The actuator and bevel gearbox combination drives the stem nut of the bevel gearbox
which is coupled with the valve stem and discs. This mechanism works like a screw jack and results in
upward/downward movement of the disc resulting in open/close condition of valve. During valve
operation, a centrally placed collapsible wedge (connected to the valve stem) exerts sealing force on
discs while moving in a downward/close direction and collapses in upward/open direction (avoids
rubbing of seating surfaces while opening).
SPECIAL FEATURES
- The valve has a rising spindle and flexible wedge with an angular seat design.
- Metal-to-metal double sealing of hard-faced, machined, ground, and lapped seating surfaces achieves high degree of isolation.
- Water can be filled between two discs of the valve to act as a water seal for 100% man-safe isolation.
- Steam purging arrangement for melting tar and drain ports for removal of molten tar and other trapped material.
- For high-pressure and large-size valves, a long stem nut arrangement can be provided.
TECHNICAL SPECIFICATIONS
| SIZE RANGE | MAXIMUM OPERATING PRESSURE | MAXIMUM OPERATING TEMPERATURE | TYPE OF SEALING | COONECTION TO PIPELINE | INSTALLATION IN PIPELINE | DRIVE | TESTING |
|---|---|---|---|---|---|---|---|
| - 400 to 3500mm | - Up to 0.3MPa | - Up to 3000C |
- Rubber - Metal to Metal |
- Flanged ends |
- Vertical in Horizontal pipeline - Horizontal in Vertical pipeline |
- Electric Manual - Hydraulic - Pneumatic - Manual |
- Body test - Seat leakage test - Operational test |
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