Fluid flow control valve mechanism

摘要: A control valve is provided with an inlet and outlet port a variable flow arrangement therebetween. The comprised of hollow spool member having plurality orifices disposed in spiral manner along the length sleeve annular contact movable axially to selectively expose one or more chamber communication port. connected flexible diaphragm first surface exposed atmospheric pressure within second signal vacuum adapted be supply. Spring means are for normally biasing into position covering all absence chamber.