Hydraulic Stroke Locking Mechanism for Pneumatic Actuators

Abstract

The invention relates to a hydraulic stroke locking mechanism for a pneumatic actuator. The upper end of the upper piston rod of the double-piston rod hydraulic cylinder penetrates upward from the center of the upper cylinder head, and the lower end of the lower piston rod penetrates downward from the center of the lower cylinder head; Installed on the bracket, the lower piston rod is inserted into the bracket through the piston rod socket from top to bottom, and the lower end of the lower piston rod is fixedly connected with the upper end of the push rod of the pneumatic actuator. The invention has reasonable structure, safe and reliable operation, and has two functions of valve position locking and manual operation. On the one hand, it can quickly lock the push rod of the pneumatic actuator together with the valve core assembly of the valve at any position in the stroke range, and the operation is simple. , labor-saving; on the other hand, it can be used as a hydraulic manual device to operate the valve in an emergency to avoid emergency shutdown of the device after the valve fails. The pneumatic actuator of the present invention does not need to be equipped with a handwheel mechanism to avoid cost waste.

Description

technical field [0001] The invention relates to a hydraulic stroke locking mechanism for a pneumatic actuator, which can lock a valve at any opening position within a valve stroke range and can be adjusted according to actual process parameters, belonging to the technical field of fluid control valves. Background technique [0002] In the control valve industry, some pneumatic control valves in important positions require the valve to have a valve position locking function when an emergency occurs, and can be manually set according to requirements. At present, there are many kinds of locking mechanisms for pneumatic actuators used as valve drivers, but most of the locking mechanisms are designed based on purely mechanical structures, such as screw nut type, latch type, mechanical limit type, etc. However, these locking mechanisms generally have problems such as cumbersome operation steps, inability to adjust or quickly reset, failure to lock the valve position due to large g...

AI Technical Summary

Problems solved by technology

However, these locking mechanisms generally have problems such as cumbersome operation steps, inability to adjust or quickly recover, failure to lock the valve position due to large gaps, and insufficient strength.

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