How does OS Y valve work?
OS&Y means “outside stem and yoke” or “outside screw and yoke”. OS&Y gate valves operate by opening and closing via a gate, which lowers into or rises out of the valve. Raising the gate allows water to flow through the valve while lowering the gate cuts off the water flowing through the valve.
How do I know if my OS&Y valve is open?
An OS&Y valve is open when the threaded stem extends from the valve. The valve is closed when the stem is not visible above the control wheel.
Are tamper switches normally open or closed?
NO is Normally Closed or NO is Normally Open Once the switch made by the third party is installed inside the waterflow, tamper, or pressure switch assembly, the lever or piston may normally push the button and quit pushing when there’s an alarm or supervisory.
What is zone control valve?
Zone Control Valve is a system designed to separate the area in case of maintenance and to get the indication of fire zone on a combination of Butterfly valve, Flow Switch, Pressure Gauge and Test & Drain Valves.
Is OS Y rising stem?
What is an OS&Y valve? Technically OS&Y stands for ‘Outside Screw and Yoke’. As the stem rises the gate inside the body of the valve rises in unison letting water flow through the body of the valve. With an OS&Y valve it is always clear whether the valve is open or closed.
Which way closes a gate valve?
clockwise
Gate valves close by turning the wheel clockwise until the water is off. Ball valves close by turning the straight handle a quarter turn clockwise until the water is off.
What is a tamper valve?
Valve tamper switches are mounted on the various fire sprinkler control valves to monitor the position of the valve. It’s critical that the sprinkler control valves remain open because, otherwise, the water will not flow through the pipes when there is a fire emergency.
What are tampers and flows?
But the two most common kinds of supervisory switches found in most sprinkler systems are tamper switches to monitor the control valves and flow or pressure switches to detect when a sprinkler system flows water.
Where is the zone valve?
Location of Zone Valves A zone valve can be located right after the boiler and circulator (hot side), or at the end of the zone circuit (cold side). If able, it is recommended to locate the valve on the cold side as it will be less damaging to the valve and improve its life-time.
Is there a yoke in a NRS valve?
What is the difference between NRS and OS&Y gate valves? NRS means Non-Rising Stem. OS&Y means Outside Stem and Yoke. In an NRS valve, the stem will turn to open and close the gate, but the stem does not move up or down as it turns.
Do gate valves have flow direction?
Gate valves are bi-directional valves and can provide shut-off in either flow directions. They are suitable for high pressure and temperature application and required less maintenance. Gate valves tend to be slightly cheaper than ball valves of the same size and quality.