This product is a low-braced open stem pneumatic gate valve with a pneumatic actuator (double cylinder with buffer mechanism) and a manual and its protection mechanism (manual and self-locking pneumatic-manual conversion device). Due to the double-layer cylinder structure, the lifting force of this valve is doubled compared with the single-cylinder pneumatic gate valve. This fundamentally solves the single-cylinder pneumatic gate valve some of the valve body wedged and can not open the disadvantages. Moreover, because the pneumatic gate valve has a buffer mechanism, it can effectively slow down and lighten the wear and tear of the sealing surface of the valve plate car and the sealing surface of the valve body caused by the downward impact of the piston when closing the valve and, at the same time, avoid the phenomenon of the gate plate jamming.

Because of its advanced technology, reliable performance, easy operation and maintenance, has been petroleum, chemical, metallurgy, electric power, shipping and other departments as a pipeline to transport gas, liquid media opening and closing devices and widely used.

Structure and use instructions

1、This valve mainly consists of valve body, valve cover, gate, valve stem, sealing ring, double-layer cylinder and its piston, piston rod, spacer together with the buffer mechanism, manual mechanism, pneumatic - manual conversion device and valve cover packing device and other parts.

2、The upper piston travels to the upper end of the stroke to top the upper return signaler, so that it sends a message; the lower piston travels to the lower end of the stroke to top the lower return signaler, so that it sends a message to the central operating room as the gate valve opening and closing information in the analog dashboard for display.

3, the handwheel on the upper part of the extension of the indicator rod of the rise and fall, marking the valve gate is in the state of lifting or falling state. When the gate valve is closed, the outer extension indicator rod is located in the lowest position; on the contrary, when the gate valve is fully open, the outer extension indicator rod is located in the highest position. This is the opening and closing status of the valve on-site instructions.

4, the upper part of the cylinder cover is equipped with pneumatic - manual conversion device. Lift the conversion handle clockwise to “pneumatic”; positioning hole positioning, the gate valve is in pneumatic operation; on the contrary, lift the conversion handle counterclockwise to “manual”; positioning at the hole, the gate valve can be operated manually. Handle with bevel gear conversion in the opposite direction. Manual operation of the gate valve, the handwheel rotation and ordinary manual valves, that is, clockwise to close, counterclockwise to open. With bevel gear rotation of the opposite..00