A flow control valve includes a valve body defining fluid inlet and outlet
sections interconnected by a connecting port. A valve unit is disposed in
the valve body and is operably connected to an actuator to be moved
thereby for opening and closing the connecting port. The valve unit
includes a valve element which has a bleed passage extending therethrough
for communicating the fluid inlet and outlet sections with one another. A
bleed piston is operably connected to the actuator and is movable thereby
relative to the valve element for opening the bleed passage when the
valve unit is in a port-closing position. The valve unit also includes a
pressure balancing passage which communicates front and rear ends of the
valve element with one another and tending to aid in statically and
dynamically balancing the fluid pressures acting on the valve element.