DOUBLE FLOW-CONTROL VALVE MECHANISM

Fluid flowing from port a to port b passes through annular slit c of the first flow-control unit and through throttling orifice d of the second unit. Piston 1 is subject at its lower end to the pressure of the fluid after first flow control, and above, at its upper end, to the pressure of the fluid after second flow control and to the action of helical spring 2. When the pressure in port a increas…