REGULATING PILOT VALVE Russian patent published in 2017 - IPC G05D16/00 

FIELD: machine building.

SUBSTANCE: invention relates to regulating valves. The regulating pilot valve (option 1) comprises a housing (2), an union (1) for impulse gas supply, c channel for impulse gas supply P_in, a cover (20) with captive nut (15), a mono-valve (33) with two cone surfaces A and E, a fixed seat (32) resting against cone surface A of the mono-valve (33), a movable seat (7) resting against cone surface E of the mono-valve (33), a measuring piston (14) with a stock (19), a command pressure cavity (6) connected with command pressure channel P_c, a command pressure union (28), a feedback pressure cavity (24) connected with a feedback pressure channel P_fb, a feedback union (11), a setting spring (21), a pushing spring (34). Input section of the fixed seat (32) and input section of the movable seat (7) resting against the appropriate cone surfaces A and E of the mono-valve (33) are made as thin-wall cylindrical shells with possibility of elastic deformation upon contact with the mono-valve, and at internal side directly at the contact places of the mono-valve (33) they have a rounding radius. The mono-valve (33) is installed with possibility of self-alignment relatively to fixed (32) and movable (7) seats. The regulating pilot valve under the option 2 differs from the option 1 in that the measuring piston (14) is made in form of the elastic bellows-piston tightly connected with the fixed support (36) and with movable support (37) forming inside the bellows-piston the feedback pressure cavity (24).

EFFECT: increased service life, operation reliability, accuracy of command pressure setting, repairability.

14 cl, 4 dwg