Gate valves are classified according to the structure of the stem

Oct 12,2021

According to the structure of the stem, the gate valve can be divided into  
    1) Open-stem gate valve: The stem nut is on the bonnet or bracket. When the gate is opened and closed, the stem nut is rotated to achieve the lifting of the stem. This structure is beneficial to the lubrication of the valve stem, and the degree of opening and closing is obvious, so it is widely used.  
    2) Dark stem gate valve: The stem nut is in the valve body and is in direct contact with the medium. When opening and closing the gate, it is realized by rotating the valve stem. The advantage of this structure is that the height of the gate valve always remains the same, so the installation space is small, and it is suitable for gate valves with large diameters or restricted installation space. This structure must be equipped with an opening and closing indicator to indicate the degree of opening and closing. The disadvantage of this structure is that the valve stem thread not only cannot be lubricated, but it is directly corroded by the medium and is easily damaged.

Hot Tags:

Shengfeng

PREVIOUS:

The working principle and function of flow limiting check valve

NEXT:

Selection of control valve