What does the valve light rod or dark rod mean?

2019-01-18 10:08:22

What is the valve light rod and the dark rod? What's the difference?

Elastic seat gate valves (dark rods) and light rods are mainly used for lining rubber gate valves. The medium is mainly water. It is mainly used in urban water supply. Usually, elastic seat valves (dark rods) are mostly used because of the valve gates. The plate is mainly rubber-lined, and it is easy to occupy the place with the stem valve stem, and damage the soft seal gate valve. Therefore, the design usually uses a dark rod, that is, the diameter of the gate plate is made a thread, and then the processed thread The valve stem is screwed into the gate plate, and the valve stem rotates the gate plate to open or close, and one principle of screwing is used, except that the light rod is run with the screw, and the dark rod is directly screwed.

(1) Open-stem gate valve: When the stem nut is on the bonnet or bracket and the gate is opened and closed, the stem can be raised and lowered by rotating the stem nut. This kind of structure is beneficial to the lubrication of the valve stem, and its opening and closing is obvious, so it is widely used.

(2) Dark rod valve: The stem nut is in the valve body and is in direct contact with the medium. When opening and closing the gate, use a rotary 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 large diameter or gate valves with limited installation space. This structure should be equipped with open and close indicators to indicate the degree of opening and closing. The disadvantage of this structure is that the stem thread not only cannot be lubricated, but also directly accepts media erosion and is easily damaged.

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