Anti-scale soft seal flat gate valve

Abstract

The invention relates to an anti-scale soft seal flat gate valve. The anti-scale soft seal flat gate valve comprises a valve body, a valve deck arranged on the upper portion of the valve body, a manipulator arranged on a support of the upper portion of the valve deck and a valve clack connected with the manipulator through a valve shaft. The valve clack is of a flat plate structure and is sealed unilaterally. The forward pressure bearing side, aligned with an inlet of a flow channel, of the valve clack is of a frame structure, and the reverse pressure bearing side, facing an outlet of the flowchannel, of the valve clack is a plane. The reverse pressure bearing side is provided with a serrated groove for embedment of a serrated sealing ring. The valve deck is internally provided with a guide slot for opening and closing the valve clack. Compared with the prior art, the anti-scale soft seal flat gate valve has the advantages of being small in thickness, small in installation space, highin water testing qualified rate, capable of achieving the bidirectional pressure bearing function, low in cost, short in machining period and the like.

Description

technical field [0001] The invention relates to a soft-sealed flat gate valve for waterways, in particular to an anti-scaling soft-sealed flat gate valve. Background technique [0002] Wedge type soft seal gate valve, because of its reliable sealing, no fouling (flat bottom). It has comprehensive advantages such as simple manufacturing and low cost, so it has been widely promoted in the past ten years, especially in water systems, basically replacing traditional hard valves, but in large-diameter wedge soft valves (≥ DN800), due to the precision of casting dimensions , The dimensional accuracy of the valve cladding is difficult to meet the design requirements, so it cannot be sealed during the production process, and the proportion of rework and scrap is high, which is a difficult problem that the valve manufacturer cannot solve, and the overall laminating cost of the large-diameter valve clack is very high. [0003] The large-diameter soft-sealed flat gate valve was origin...

AI Technical Summary

Problems solved by technology

It has comprehensive advantages such as simple manufacturing and low cost, so it has been widely promoted in the past ten years, especially in water systems, basically replacing traditional hard valves, but in large-diameter wedge soft valves (≥ DN800), due to the precision of casting dimensions , the dimensional accuracy of valve cladding is difficult to meet the design requirements, so it cannot be sealed in the production process, and the proportion of rework and scrap is high, which is a difficult problem that valve manufacturers cannot solve, and the overall laminating cost of large-diameter valve clacks is very high

[0003] The large-diameter soft-sealed flat gate valve was originally a traditional gate valve evolved from the knife gate valve. It generally adopts a single-sided sealing structure and the sealing ring is fixed on the valve body. The gate plate is made of stainless steel, and the bottom must have grooves. Disadvantages of disc packing wear and leakage, and this type of valve face is relatively short, the valve body is relatively light, but the valve disc is mostly stainless steel, the cost is relatively high, and the bottom is easy to deposit garbage during operation, which makes it impossible to close. Adding a sand discharge outlet, but it can only discharge some small garbage, and large stones and other sundries cannot be excluded

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