Flat gate valve easy to open and close

Abstract

The invention discloses a flat gate valve easy to open and close. The flat gate valve comprises a valve body and a pressure reducing mechanism. A gate for separating a medium circulating passage into an upstream passage and a downstream passage is disposed in the valve body. The pressure reducing mechanism comprises a flow retaining plate, two valve seats, a cavity, a lifting rod and a lifting hand wheel, wherein the cavity is fixed on the valve body corresponding to the upstream passage, the two valve seats are symmetrically fixed in the upstream passage, one end of the lifting rod is connected with the flow retaining plate, the other end of the lifting rod is connected with the lifting hand wheel which is disposed on the cavity, the lifting hand wheel cooperates with the lifting rod to allow the gate the move up and down between cavity and the two valve seats. The flat gate valve has the advantages that the pressure borne by the gate during opening and closing of the gate valve can be reduced, and the opening and closing of the gate valve is allowed to be easy, convenient and fast.

Description

technical field [0001] The invention relates to a gate valve, in particular to a flat gate valve which is easy to open and close. Background technique [0002] The gate valve used in the existing oil production wellhead device mainly controls the upward and downward movement of the gate through the hand wheel to open or close the medium circulation channel in the valve body. The gate valve generally includes a valve body, a valve seat, a bonnet, a gate plate, a valve stem and a transmission handwheel. The gate valve is opened and closed mainly through the transmission handwheel to control the lift of the gate plate. For example, Chinese Patent No. "200920119184.8" discloses a slab gate valve, and its publication date is March 31, 2010. The operating mechanism, the valve seat is placed in the valve body, the gate plate is closely fitted with the valve seat, one end of the valve stem is connected with the gate plate, and the other end is connected with the operating mechanism...

AI Technical Summary

Problems solved by technology

[0003] However, the existing technology represented by this patent document still has the following defects in the actual use process: 1. When the transmission handwheel controls the lift of the gate, because the pressure in the upstream channel in the valve body is greater than the pressure in the downstream channel , often makes the pressure on each part of the gate different. For example, when the gate valve is closed, the gate moves downward under the control of the transmission handwheel. The pressure on the upper part of the gate plate of the flow channel, which causes the gate plate to be easily deformed or damaged

2. Since the pressure in the upstream channel in the valve body is greater than the pressure in the downstream channel, the operator needs to turn the transmission handwheel hard to complete the opening or closing of the gate valve. Not only is the gate valve difficult to open and close, but it also results in high labor intensity.

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