PNEUMATIC ACTUATOR FOR AXIALLY SYMMETRIC VALVE Russian patent published in 2019 - IPC F16K31/143 F15B11/72 

FIELD: machine building.

SUBSTANCE: invention relates to machine building and can be used for control of valve at control of flow rate and pressure of gases on pipelines of process lines. Axial-symmetric valve air drive comprises pneumatic cylinder (3) with piston (4) with rod (5) installed in it. Air cylinder (3) is fixed on support in the form of post (1). Rod (5) of piston (4) is connected to stock (7) of axisymmetrical valve (8). Above pneumatic cylinder (3) on mounting plate (2) there is housing (10) with piston (4) rod (5) passing through it. On top of body (10) hydraulic cylinder (17) is installed. Rod (18) of hydraulic cylinder (17) is rigidly connected with rod (5) of piston (4). On rod (5) in housing (10) conductor (11) is fixed. Around rod (5) in housing (10) between plate (9) and conductor (11) elastic elements in the form of springs (12), (13) are installed. Springs (12), (13) have opposite direction of winding in amount of at least four of each direction and are installed through one with the possibility of compression when pressure is supplied to working cavity (15) of pneumatic drive. On rod (5) in housing (10) additional conductor (15) is installed under conductor (11). Explosion-proof limit switches (20) and positioner (21) of drive mechanisms are attached to support (1), a hand-held doubler in the form of hydraulic system (25), which is simultaneously a hydraulic damper. Hydraulic cylinder (17) is equipped with oil tank (19). Hydraulic cylinder (17) is equipped with heating system. Rod (18) of hydraulic cylinder (17) is connected to rod (5) of piston (3) by means of a threaded joint with the fixing sealant applied on it. All pneumatic drive equipment is installed in separate casings (22), (23), (24).

EFFECT: increased reliability of pneumatic drive operation at valve control at control of gas flow rate on pipelines, convenience of its servicing and increased fabricability.

4 cl, 3 dwg