High efficiency decompression pneumatic gate valve

Abstract

The invention relates to a gate valve, in particular to an efficient pneumatic relief gate valve. According to the specific technical scheme, the efficient pneumatic relief gate valve comprises a valve body, a bonnet, a valve seat, a valve stem, a gate plate linked with the valve stem and a pneumatic device. The valve body is provided with a medium incoming passage, a medium outflow passage and a connecting passage. The pneumatic device comprises an air source, a cylinder and an electromagnetic valve whereby the cylinder and the gas source are connected. A piston is disposed inside the cylinder and is linked with one end, extending out of the bonnet, of the valve stem. The cylinder is internally provided with an opening drive cavity and a closing drive cavity. The cylinder is provided with an opening air pass opening at the opening drive cavity and a closing gas pass opening at the closing drive cavity. An elastic butting member, with one end in butt joint with the piston and the other end in butt joint with the bonnet, is disposed inside the opening drive cavity. A pneumatic control valve is disposed between the electromagnetic valve and the opening drive cavity and closing drive cavity of the cylinder. The efficient pneumatic relief gate valve according to the technical scheme is wear resistant, leak proof, deformation proof, and capable of stably running.

Description

technical field [0001] The invention relates to a gate valve, in particular to a high-efficiency decompression pneumatic gate valve. Background technique [0002] A gate valve is a valve that is closed or opened by a gate to cut off the medium in the pipeline. Gate valves controlled by pneumatic methods usually need to install a cylinder on the valve body of the gate valve. A piston that can move back and forth along the axial direction of the cylinder cavity is arranged in the cylinder. In the air source of the output air source and the solenoid valve installed between the air source and the cylinder, the gate valve of the gate valve drives the valve stem in the valve body to lift up and down through the piston, thereby constituting the opening or closing of the gate valve; however, the opening force of the gate valve and The closing force is different, especially for wedge gate valves, usually the closing force should be set relatively small, as long as the sealing surfac...

AI Technical Summary

Problems solved by technology

[0003] For ordinary pneumatic gate valves, the closing force and opening force are basically the same, and due to the existence of the valve stem, the closing force of the gas medium acting on the piston of the pneumatic gate valve is slightly greater than the opening force. Smaller, during use, the closed gate valve is often not guaranteed to open. In order to open the gate valve, the air source pressure of the pneumatic device is usually increased. However, too high air source pressure often causes the closing force of the gate valve to be too high. Therefore, conventional pneumatic gate valves have the problem of contradiction between closing force and opening force, which leads to various problems in pneumatic gate valves.

Images