FIELD: machine engineering.
SUBSTANCE: regulating port control device contains a control element with a valve plunger, connected to the valve rod, and a pressure detecting labyrinth, partly shaped by the valve plunger. The pressure detecting labyrinth is designed for hydraulic connection between the sealing surface of the valve plunger and regulating diaphragm, fixed inside the control element. The pressure detecting labyrinth includes at least two pressure detecting channels. The first pressure detecting channel, running through the valve plunger and having an entrance, extending through the valve plunger along the central axis of the control element; and at least one second pressure detecting channel, running through the valve plunger. The first pressure detecting channel and said at least one second pressure detecting channel are in hydraulic connection with the regulating cavity so that the liquid pressure on the sealing surface of the valve plunger is equal to the fluid pressure in the regulating cavity to apply the equivalent and opposite first and second forces to the sealing surface of the sealing surface of the valve plunger and to the first surface of the regulating diaphragm, respectively. The setting is done in such a way that the fluid pressure, being on the sealing surface of the valve plunger, is also in the regulating diaphragm, leading to the application of the equivalent and opposite forces to the control element.
EFFECT: prevention of the transfer capacity decrease at the input pressure overrunning 8 bar.
18 cl, 7 dwg
