Gate valve capable of preventing sealing surface from being scratched during opening and closing

Abstract

The invention discloses a gate valve capable of preventing a sealing surface from being scratched during opening and closing. The gate valve comprises a valve shell, valve elements and a valve deck, wherein a valve cavity is formed in the valve shell; connecting pipes communicating with the valve cavity are fixed to the left side and the right side of the valve shell; a gate plate is slidably connected into the valve cavity; a through hole is formed in the lower side of the gate plate; grooves are formed in the left side and the right side of the upper end of the gate plate; and the valve elements are connected into the grooves through splines. The gate valve capable of preventing the sealing surface from being scratched during opening and closing is provided with the grooves, the valve elements and bevel gears, when the gate plate moves to the lowermost side, the center lines of the valve elements coincide with the center lines of the connecting pipes; a hand wheel is rotated, a rotating shaft is driven to rotate through a gear ring, a connecting gear, a connecting cylinder, a connecting rod, a second bevel gear and a first bevel gear in sequence, and the rotating shaft pushes the valve elements to slide along the grooves until the valve elements are attached to the inner walls of the valve cavity on the outer sides of the connecting pipes; and through a sealing structure, friction of a sealing door is avoided when the valve elements move, and the service life of the gate valve is prolonged.

Description

technical field [0001] The invention relates to the technical field of gate valves, in particular to a gate valve which can prevent the sealing surface from being scratched during opening and closing. Background technique [0002] The valve is the control part in the fluid conveying system, which has the functions of cut-off, adjustment, diversion, prevention of reverse flow, pressure stabilization, diversion or overflow pressure relief, etc. Among them, the gate valve has the medium that can flow in any direction on both sides, which is easy to install and not easy to produce Water hammer and other characteristics. [0003] When the existing gate valve is fully opened, the spool and the valve cavity used to accommodate the spool make the inner flatness of the gate valve not high, which in turn leads to an increase in the flow resistance of the medium. This gate valve is not effective in use. The existing gate valve When opening and closing, the sealing surface between the ...

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to provide a gate valve that can prevent the sealing surface from being scratched during opening and closing, so as to solve the problem that the valve core and the valve cavity for accommodating the valve core are uneven when the existing gate valve proposed in the background art is fully opened. The internal flatness of the gate valve is not high, which in turn leads to an increase in the flow resistance of the medium. The gate valve is not effective in use. When the existing gate valve is opened and closed, the valve core and the sealing surface of the valve cavity are prone to friction. After long-term use, The sealing surface between the spool and the valve cavity is easily damaged by friction, which affects the sealing effect of the gate valve. In addition, the bottom of the spool of the existing gate valve is usually not provided with a support structure, and the medium directly impacts the bottom of the spool when opening and closing. The bottom is easily deformed by the impact of the medium for a long time, so the existing gate valve is difficult to be used as a control part for adjusting the flow rate, and it has certain limitations in use.

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