FIELD: machine building.
SUBSTANCE: proposed invention can be used for control purposes in oil refining, chemical processing installations, foodstuffs processing units or similar. Essence of the invention consists in the valve system containing the mechanism moving the valve to its safety position. The system incorporates the valve actuator wherein a fluid medium is forced by the aforesaid controller comprising the pressure relief reversing valve. Note that if pressure in the valve actuator should be reduced for the valve to move into its safety position, the aforesaid reversing valve opens to form a channel to instantaneously drop excess pressure at the controller outlet.
EFFECT: control over pressure and fluid medium flow rate.
22 cl, 3 dwg
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