OS&Y Flanged Gate Valve is an important type of fire protection and water control valve used to fully open or fully close the flow of water in pipelines. OS&Y stands for “Outside Screw and Yoke,” which means the stem moves up and down outside the valve body, making it easy to visually check whether the valve is open or closed. This valve is widely used in fire fighting systems due to its reliable shut-off capability and low pressure loss when fully open.
Specification
- UL Listed / FM Approved
- Standard: BS 5163
- Connection: Flanged as BS EN 1092-2
- Test Pressure: Factory hydro test 24 bar
- Temperature Range: 0 to 100°C
- Working Pressure: PN16
- Surface Coating: Fusion Bonded Epoxy (FBE) as per AWWA C550
Features
OS&Y gate valves are designed for smooth operation and long service life. The rising stem design allows clear indication of valve position. When fully opened, the valve provides unobstructed flow with very low friction loss. The strong construction ensures durability in high-pressure fire protection systems.
Applications
This valve is commonly used in fire protection systems, sprinkler systems, water distribution lines, industrial pipelines, and commercial buildings. It is especially important in fire safety installations where reliable isolation of water flow is required.
Working Principle
The valve operates by lifting a gate out of the water flow path. When the handwheel is rotated, the stem moves the gate upward or downward. In the fully open position, water flows freely, and in the closed position, the gate blocks the flow completely.
Description
Gate valves are bi-directional isolating valves used to control water flow. They are not designed for throttling but for full open or full close operation. OS&Y type gate valves provide a clear visual indication of position and are preferred in fire protection systems for safety and reliability.
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