What is outside screw and yoke?

Published by Charlie Davidson on

What is outside screw and yoke?

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.

What is the purpose of an outside stem and yoke valve?

The outside stem and yoke valve is the most common type of indicating valve. The valve operates by raising and lowering a gate that cuts off the water flowing through the valve casing.

Which is a characteristic of outside screw and yoke valves?

What is a characteristic of an outside screw and yoke OS&Y valve? An OS&Y Valve (outside screw & yoke) functions by opening and closing via a gate, which lowers both in and out of the valve. When the handle is turned clockwise the gate will close preventing any water from traveling through the valve.

What is valve yoke?

Yokes are a type of mounting bracket. It uses a coupling to connect the valve stem and actuator stem as well as two brackets that hold the actuator and valve together.

What is the yoke on a gate valve?

A Yoke connects the valve body or bonnet with the actuating mechanism. One type of valve commonly used to control water flow to fire sprinkler systems is known as an OS&Y gate valve.

How do I know if my OS&Y valve is open?

Outside Stem & Yoke (OS&Y) valve (also called an indicating gate valve)—Indicating type means that one can visually determine if the valve is open or closed. 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.

What is a post indicator valve used for?

Installed in the main water line serving a building, the Post Indicator Valve (PIV) is a valve used to control the water supply to the fire sprinkler system. Most commonly a raised post, the PIV is found in the yard near the building or mounted on the outside of the building.

What is the difference between a DIN valve and a yoke valve?

First, what is the difference between them? The yoke is a clamp-type mounting, which is placed over the tank valve and then tightened into place. The DIN is a threaded valve, wherein you screw the regulator into the tank valve.

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