The difference between rising and non-rising stem gate valves

The gate valve can only be in one of two operating positions: fully open or fully closed. They are widely used in various industries, especially in water supply chains, central heating systems, oil and gas projects, firefighting operations, etc. They are usually divided into two different types: rising stem gate valves and non-rising stem gate valves. The differences between the two are as follows.

Material: Rising stem gate valves are usually made of cast or forged steel, while non-rising stem gate valves are more commonly made of brass, bronze or cast iron. Non-rising stem gate valves require less space and rising stem gate valves require more space. In the rising stem gate valve, the round handle rotates a threaded stem attached to its centre. 

Design: The stem nut of the rising stem gate valve is located on the bonnet or bracket. When the gate is opened and closed, the stem nut is rotated to realise the lifting of the stem. The stem nut of the non-rising stem gate valve is located in the valve body and is in direct contact with the medium; when the gate opens and closes, it is realised by rotating the stem.

Installation space: the rising stem gate valve requires a larger installation space due to the stem; the height of the non-rising stem gate valve is small and it does not take up too much space during installation.

Application: the structure of the rising stem gate valve is favorable to the lubrication of the stem, and the degree of opening and closing is obvious; the stem thread of the non-rising stem gate valve not only cannot be lubricated, but it is directly corroded by the medium and easily damaged. The non-rising stem gate valve has a wider range of applications.

Jodith manufactures rising stem and non-rising stem gate valves, of reliable quality at a low market price. If you are looking for gate valves, you can contact us freely and get the best valve option.