Hydraulic automatic gate valve

Abstract

The invention relates to a gate valve, in particular to a hydraulic automatic gate valve which can be opened and closed under the pressure of a conveying medium. The hydraulic automatic gate valve comprises a valve body, a bonnet, a valve rod, a gate plate, a valve rod driving oil cylinder and a change-over switch; a first piston cavity and a second piston cavity, which are communicated and have different cross sections, are arranged in the oil cylinder; a first piston and a second piston are arranged in the first piston cavity and the second piston cavity respectively; the first piston and the second piston are fixed on the same piston rod to form linkage; and one end of the piston rod is linked with the upper end of the valve rod. In the hydraulic automatic gate valve, the valve rod driving oil cylinder having a piston with a variable cross section and the change-over switch are arranged, and by using the variation of the cross section of the piston rod, the change-over switch communicates different parts of the inner cavities of the valve rod driving oil cylinder with a feeding cavity and a discharging cavity in different states so as to open and close the gate valve by using the pressure of the conveying medium.

Description

technical field [0001] The invention relates to a gate valve, in particular to a liquid-type automatic gate valve which can be opened and closed by the pressure of the conveying medium. Background technique [0002] The valve is a pressurized container, and the medium to be conveyed has a certain pressure. In order to ensure the safety and reliability of the medium in the process of conveying the medium, the closing parts of the gate valve adopt a large sealing specific pressure, so it needs a lot of pressure during the opening and closing process of the valve. The large torque and opening force make the operator consume a lot of physical strength. In order to improve labor efficiency and reduce the operator's physical consumption, the existing valves usually use electric, hydraulic or pneumatic control devices to open the valve, which have also achieved remarkable results in improving labor efficiency and reducing the operator's physical consumption. . However, the above ...

AI Technical Summary

Problems solved by technology

However, the above three control devices use electric energy, liquid and gas as the control energy respectively, so they will consume a certain amount of energy. At the same time, the addition of electric devices, hydraulic devices, and pneumatic devices has increased the overall volume and weight of the valve. The control has continuous energy, and it also needs to be connected to a power supply or external energy supply facilities such as hydraulic stations and air compressors, which increase a lot of costs

And when the pipeline equipped with valves passes through the wilderness without electricity, the above three devices cannot be used, and they have to be operated by physical strength, which is labor-intensive.

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