Gate valve

Abstract

The invention discloses a gate valve comprising a valve body, a valve rod, a flashboard, a valve seat and a valve cover. The valve body is matched with the valve cover; the valve rod extends into the inner cavity of the valve body from the top down; the lower end of the valve rod and the flashboard are in T-shaped groove connection; the valve rod moves up and down to drive the flashboard to move up and down so as to carry out opening and closing operation on the valve; the valve seat is arranged in the valve body and is matched with the flashboard; the flashboard is of a wedge-shape structure, of which the upper portion is wide and the lower portion is narrow, and is formed by a left wedge-shape flashboard and a right wedge-shape flashboard; the left wedge-shape flashboard and the right wedge-shape flashboard are engaged together; the oppositely-arranged side surfaces of the left wedge-shape flashboard and the right wedge-shape flashboard are symmetrically provided with wedge-shape grooves; the two wedge-shape grooves are combined to form a wedge-shape installation groove; and the wedge-shape installation groove is internally provided with a movable push core. Acting force applied to the flashboard is transmitted through the movable push core to improve sealing force of the flashboard; and the gate valve is good in seal performance, long in service life and convenient to replace and maintain.

Description

technical field [0001] The invention relates to a gate valve structure, in particular to a wedge gate valve. Background technique [0002] The opening and closing part of the gate valve is a gate, and the movement direction of the gate is perpendicular to the direction of the fluid. The gate valve can only be fully opened and fully closed, and cannot be adjusted and throttled; the two sealing surfaces of the gate are the most commonly used mode gates. The two sealing surfaces of the plate valve form a wedge shape, and the wedge angle varies with the valve parameters, usually 5°, and 2°52′ when the medium temperature is not high; the gate of the wedge gate can be made into a whole, called a rigid gate ; It can also be made into a gate that can produce a small amount of deformation to improve its manufacturability and compensate for the deviation of the sealing surface angle during processing. This kind of gate is called an elastic gate; when the gate valve is closed, the seal...

AI Technical Summary

Problems solved by technology

[0003] see figure 1 As shown, the existing gate valve includes a valve seat 1, a gate plate 2, a gate seat 3, a valve stem 4, and a spring 5 arranged in the gate plate; the gate plate is only positioned by the upper and lower splint seats, and the gate plate has the risk of falling off; the sealing The surface depends on the performance of the spring, which shortens the service life of the valve; the force is transmitted through the gate, and the contact surface between the gate and the gate is easily damaged. After the damage, the gate must be replaced, and the maintenance cost is high.

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