a gate valve

Abstract

The invention discloses a gate valve which comprises a rotary type hand wheel (1), a valve body (2), a valve cover (3), a valve plate (4), a valve rod (5), a stuffing pressing nut (6) and a latex ring (7), wherein a vertical through hole is formed in the center of the valve rod (5); a lifting rod (8) is inserted into the through hole; the lower end of the lifting rod (8) is connected with the lower end of the valve plate (4); the upper end of the lifting rod (8) is connected with an indicating ball (9); a circular-ring-shaped pit (10) is formed in a position, around the through hole, at the lower end of the valve rod (5); the lower part of the latex ring (7) is integrally formed with a plurality of thin walls and thick walls surrounding the lifting rod (8) alternatively in the vertical direction; and after the latex ring (7) allows the lifting rod (8) to tightly pass through, the upper end of the latex ring (7) is tightly spliced into the pit (10). The indicating ball (9) is highly positioned on the top surface of the hand wheel (1) or is lowly positioned on the top surface of the hand wheel (1), so that an opening-closing state of the gate valve is intuitively reflected.

Description

technical field [0001] The invention belongs to valves, and more specifically relates to a gate valve. Background technique [0002] The opening and closing of the existing gate valves is realized by turning the rotary handwheel counterclockwise or clockwise. Although the handwheel is marked with an indication of the direction of force for opening and closing, it does not have any information about the opening and closing state. Indication function, but in actual production, the gate valve is often required to have this function. For example, when the upstream of the logistics system unexpectedly stops the transportation, there is no liquid flowing out of the downstream, and the gate valve in the open state is easily mistaken for being in the closed state. Whether it should be closed or not, once the upstream transportation resumes, waste or safety accidents will often occur. Contents of the invention [0003] The object of the present invention is to provide a gate valve...

AI Technical Summary

Problems solved by technology

[0002] The opening and closing of the existing gate valves is realized by turning the rotary handwheel counterclockwise or clockwise. Although the handwheel is marked with an indication of the direction of force for opening and closing, it does not have any information about the opening and closing state. Indication function, but in actual production, the gate valve is often required to have this function. For example, when the upstream of the logistics system unexpectedly stops the transportation, there is no liquid flowing out of the downstream, and the gate valve in the open state is easily mistaken for being in the closed state. Whether it should be closed or not, once the upstream transportation resumes, it will often be wasted or safety accidents will occur

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