PNEUMATIC ACTUATOR FOR AXISYMMETRIC VALVES Russian patent published in 2017 - IPC F16K31/143 F15B11/72 

FIELD: machine engineering.

SUBSTANCE: pneumatic actuator for the axisymmetric valves contains a pneumatic cylinder (1), in the cavity of which there is a piston (6) rigidly connected to the valve stem, hydraulic cylinder (2), elastic elements in the form of springs (5). Springs (5) have the opposite winding direction and are installed through one around the hydraulic cylinder (2) between the piston (6) and the support (3) in an amount of not less than four. The hydraulic cylinder (2) is installed under the piston (6) on the support (3). The piston rod (6) is connected to the valve stem (9). The explosion-proof limit switches (12) and the positioner of the drive mechanisms (13) are attached to the support (3). As a handwheel, a hydraulic system (16) is used, connected by means of a pipeline to the working cavity "G" of the hydraulic cylinder (2). Hydraulic system (16) is simultaneously a hydrodrome.

EFFECT: increasing the reliability of the pneumatic actuator while controlling the valve while regulating the flow and pressure of natural gas in pipelines.

3 cl, 3 dwg