Solenoid To pressure sensing port (downstream pressure) From air supply (upstream) To starter (downstream) Restriction Filter On Control crank Control rod Bellows Pilot valve cap Stationary cam Rotating cam Inlet pressure Regulating valve Valve shaft Servo-piston Pilot valve rod Open Figure 5-24.  Pressure-regulating and shutoff valve in on position.  combination pressure-regulating and shutoff valve. These  procedures should be used as a guide only and are not  intended to replace the manufacturer’s instructions. 5-17