Rising Stem Gate Valve Actuator

Non rising stem gate valve.

Rising stem gate valve actuator.

When opening or closing the gate it is through the rotating of valve stem. The disc travels along the stem like a nut when the stem is rotated. The valve disk is threaded internally. 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.

You can see the image. Non rising stem gate valve or insider screw valve. Stem nut for open stem gate valve is on its cover. All valves 14 and larger are cast with.

The gate has two sealing surfaces. Models are available with a spring return option to open or close. The stem nut is inside valve body and contact with the medium directly. Orbit rising stem ball valves can be equipped with perfectly matched valve linear actuators and many capabilities can be added to the basic double acting actuator.

The wedge angle varies with valve parameters usually 50 and 2 52 when the medium temperature is not high. According to the screw position of the stem the gate valve can be divided into rising stem gate valves and non rising stem gate valve nrs. The rising stem gate valve can only be fully opened and fully closed and cannot be adjusted or throttled. Manual override mechanisms also are available.

The two sealing surfaces of the most commonly used mode gate valve form a wedge. The advantage of this construction is that the height of gate valve remains the same so the installation requires small room and is suitable for big gate valves or. Compared with other valves gate valves have a wider range of combined applications for pressure service fluid design pressure and temperature.