Pneumatic valve control mechanism

Abstract

A pneumatic valve control mechanism is disclosed, a pneumatic valve comprises a valve body and an upper valve cover, a valve spool, and a valve shaft. The valve spool is provided with a passage. The pneumatic valve control mechanism comprises a rotating cylinder, a cylinder driving actuator, a sealing control mechanism, and a valve spool action position detecting mechanism. The outer walls of thetwo ports of the valve spool are provided with sealing grooves along the circumferential direction, and an inflatable sealing ring is arranged in the sealing groove. A spool intake passage communicating with the sealing groove is arranged in the valve spool along the radial direction. A valve shaft intake passage communicating with the spool intake passage is axially arranged in the valve shaft. The spool intake passage communicates with the inflatable sealing ring. The valve spool is actuated through the cylinder, after the valve spool reaches the set position and the air pressure is controlled to inflate and pressurize the sealing ring, so that the valve meets the requirement for complete sealing. According to the requirements for use, the pressure of the gas entering the sealing ring can be adjusted by a filter pressure reducing valve. The control mechanism of the invention can be used under the working conditions of high sealing performance requirement and abrasion on the sealing surface, thereby achieving the function of safe, reliable and stable operation of the equipment and reducing the maintenance frequency of the equipment.

Description

technical field

[0001] The invention relates to valve control technology, in particular to a pneumatic valve control mechanism. Background technique

[0002] In the working condition of the pneumatic conveying system with high pressure requirements and the medium wearing the sealing surface, the traditional valve structure is that the sealing ring between the valve body and the valve core is always in a squeezed state, when the cylinder drives the valve core to move Due to the high pressure of the conveying system, the seal ring loses its complete sealing effect soon after wear, the service life of the guide seal ring is short, the replacement frequency of the seal ring is high, and the maintenance cost increases. Contents of the invention

[0003] The purpose of the present invention is to propose a pneumatic valve control mechanism, which can ensure that the sealing ring is not worn out, and can ensure stable sealing performance of the valve when the pressure of the conv...

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