Non Rising Stem Gate Valve Definition

Non rising stem gate valve. Non rising stem gate valves are recommended when positive shutoff is required and where space is a premium. Os y means outside steam and york.

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When the non rising stem gate valve is on and off the steering wheel and the stem are connected together and relatively fixed.

Non rising stem gate valve definition. Non rising stem valves take up less space and rising stem. All valves 14 and larger are cast with bronze body and wedge guides. They take up less vertical space since the stem is kept within the valve body. Designed and manufactured for use in wastewater and sewage applications pratt gate valves are produced in both non rising stem nrs and outside screw yoke os y versions.

Avk offers gate valves with a factory mounted indicator on the upper end of the stem to indicate the valve position. Non rising stem gate valve or insider screw valve. There are two basic internal gate and stem designs used on this type of valve. 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.

It drives the valve plate up and down by turning the stem at a fixed point. Non rising and rising stem. As the stem turns it moves into or out of the valve which also moves the gate to open or seal the valve. Non rising stem designs raise the gate around the stem and rising stem types feature a stem and gate which move up and down together.

Usually there is a trapezoidal thread at the bottom end of the valve stem. The iron body bronze mounted ibbm valve has a bolted bonnet and non rising stem. When opening or closing the gate it is through the rotating of valve stem. The nibco cast iron gate valve provides full flow with minimal pressure drop.

The stem nut is inside valve body and contact with the medium directly. Non rising stems are threaded into the gate and rotate with the wedge rising and lowering inside the valve. Available in sizes 2 through 96 our metal seated solid wedge valves are designed in accordance with awwa c500 standards as well as ansi and astm standards. This type of valve is also known as os y valve.

The drive thread of non rising stem gate valve is located in the valve body. Whereas in the case of outside screw design the only smooth portion is exposed to the flow medium and the stem will rise above the handwheel. The valve stem nut is set on the gate and the rotation of the handwheel drives the rotation of the valve stem to lift the gate. Non rising stem gate valve is also called rotating stem gate valve also called dark stem wedge gate valve.

Rising stem valves are usually made from cast or forged steel while non rising stem valves are more typically brass bronze or cast iron. Non rising stem means outside stem also referred to as the rotary stem gate valve or blind stem wedge gate valve. The rising stem valve types are also divided into two different types. The cast iron gate valve features a class 125 flanged flat face end connection for easy installation and accessibility.