High-guidance wedge gate valve capable of reducing sealing face abrasion

Abstract

The invention discloses a high-guidance wedge gate valve capable of reducing sealing face abrasion. The high-guidance wedge gate valve comprises an upper valve body, a lower valve body, a valve rod assembly, a valve seat and a flow guide channel. The valve rod assembly is driven by a power assembly to move along a valve cavity, an inverted-T-shaped groove is formed in the top of a gate board and penetrates through the gate board in the direction of the flow guide channel, a connecting hole communicating with the inverted-T-shaped groove is formed in the center of the gate board, the valve rodassembly comprises a valve rod and a connecting seat, the valve rod is provided with a limiting part and extends into the bottom of the connecting hole, seat bodies of the connecting seat are insertedin the inverted-T-shaped groove, the section of the connecting seat in the vertical direction is matched with that of the inverted-T-shaped groove, a threaded hole is formed between the two seat bodies in a surrounding mode, the lower half section of the valve rod is provided with an external thread connected with the threaded hole, the hole diameter of the threaded hole is smaller than that of the connecting hole, and the bottom end of the valve rod is located in the position near the top of the flow guide channel. The valve rod rotates relative to the gate board so that movement and limitation can be achieved, a guide effect is achieved when the gate board moves, a sealing face is prevented from being abraded, and the service life of the gate valve is prolonged.

Description

technical field [0001] The invention relates to a gate valve, in particular to a gate valve with wedge-shaped gate plate section. Background technique [0002] Wedge gate valve is a kind of gate valve. It is named for its sealing surface at a certain angle to the vertical centerline, that is, the two sealing surfaces are wedge-shaped. In general, for gate valves with two wedge-shaped sealing surfaces, the angles between the sealing surface and the vertical center line are 2°52', 3°30', 5°, 8°, 10°, etc. as attached figure 1 As shown, it is a common wedge gate valve in the prior art. When the power mechanism (which can be electric, pneumatic, or manual) drives the valve stem 1' to move up and down, the gate plate 2' fixed at the bottom of the valve stem 1' moves with the valve stem 1' to block or close the diversion path . Gate valves are usually only used as on-off valves, and generally cannot adjust the flow rate. When the gate valve is in use, it will be limited by t...

AI Technical Summary

Problems solved by technology

However, the manufacturing cost of the gate valve is relatively high, so enterprises can only choose to replace the gate and valve seat

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