OS&Y Valve

An OS&Y valve (Outside Stem and Yoke) is a type of gate valve commonly used in fire protection systems and industrial applications. Here’s a breakdown of its features, function, and advantages:

1. What is an OS&Y Valve?

• OS&Y stands for Outside Stem and Yoke.

• It is a rising stem gate valve where the stem moves up and down to indicate whether the valve is open or closed.

• Used primarily in fire protection systems, HVAC, and water supply networks.

2. How Does It Work?

• When the valve is open, the stem rises above the handwheel, making it visually clear that the valve is open.

• When the valve is closed, the stem moves down into the valve body.

• This mechanism makes it easy to check the valve position without needing extra indicators.

3. Advantages of OS&Y Valves

✅ Visual Position Indicator – You can easily tell if the valve is open or closed.
✅ Prevents Accidental Closure – Since it’s easy to see the stem’s position, accidental shutdowns are less likely.
✅ Long-Lasting – OS&Y valves are durable and less prone to internal wear compared to non-rising stem valves.
✅ Better Flow Control – Provides full flow when open, reducing pressure loss.

4. Common Applications

• Fire sprinkler systems

• Industrial pipelines

• Water treatment plants

• HVAC systems