valve 100 input bore 112 the output bore 114 is connected to the plunger side of an air cylinder 4 the rod side of the air cylinder 4 exhausts out through the control valve 2 to the atmosphere when fluid is pumped from the supply source 1 it forces the plunger in the air cylinder 4 towards the rod side thus extending the rod to lift a load 8 to lower the load 8 the flow control valve 2 is manipulated to connect the supply source 1 to the rod side of the cylinder 4 through the retract line 9 however the fluid on the plunger side of the cylinder 4 needs to be able to exhaust if the plunger is to move thus a tap line may place the retract line 9 in fluid communication with the pilot port 116 on the valve 100 in this way the fluid pressure in the piston bore 110 a forces the cartridge 200 against the bias of the end cap spring 156 thereby unseating the poppet member 230 thus opening the valve 100 and allowing the exhaust fluid from the plunger side of the cylinder 4 to enter the output bore 114 past the poppet member 230 out of the input bore 112 and to exhaust out through the.