Pressure Sensitive Pneumatic Servo Control Valve

Abstract

The invention relates to a pressure-sensing pneumatic follow-up control valve, belonging to the technical field of control valves, including a valve body, a first plate body, a second plate body, a first diaphragm, a second diaphragm, a piston rod and a pull rod; the first diaphragm and The second diaphragm is respectively connected with the first plate and the second plate, and divides the cavity of the valve body into a first chamber, a second chamber and a third chamber; the tie rod is fixedly connected with the second plate, The valve body is provided with a first flow path, a second flow path, a third flow path and a fourth flow path, one end of the first flow path communicates with the air source, and the second flow path will load the cylinder and the first chamber The third flow passage connects the load cylinder with the third chamber, and the fourth flow passage connects the second chamber with the outside of the valve body; the piston rod can slide to make the first flow passage connect with the first chamber The chambers are connected or blocked, the first chamber and the second chamber are connected or blocked. The pressure-sensing pneumatic follow-up control valve of the present invention can ensure the steady lifting of the load.

Description

technical field [0001] The invention relates to a control valve, in particular to a pressure-sensing pneumatic follow-up control valve, which belongs to the technical field of control valves. Background technique [0002] The publication number is CN212292623U, and the name is air-controlled self-induction pneumatic balance crane. It discloses a device for lifting objects. And two normally open manual two-position three-way valves, which effectively solve the lifting accuracy of lifting and moving objects of different weights, and expand the lifting range of the pneumatic balancer. The technical problems in this patent include: (1) The whole device uses more control valves, which is a bit redundant. (2) The device can only control the lifting of the equipment, without induction control function and feedback function, the lifting speed is faster under the condition of no load or light load, and there will be rapid movement when starting; when the load is heavy, the rising sp...

AI Technical Summary

Problems solved by technology

The technical problems in this patent are: (1) The whole device uses more control valves, which is a bit redundant

(2) The device can only control the lifting of the equipment, without induction control function and feedback function, the lifting speed is faster under the condition of no load or light load, and there will be rapid movement when starting; when the load is heavy, the rising speed Slower inflation time will also be longer, there will be movement when descending, and the speed is not easy to control

(3) The device realizes the switching of the lifting mode and the follow-up mode through the switching of dual gas circuits, and it is necessary to increase the switching signal line, which leads to a limited range of complex applications and can only be used for special purpose.

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