1. Pilot valves are valves which are used to control other valves.2. The pilot valve is always larger in flowrate than the filling through the throttle valve. 3. The pressure from the pilot tube to the dome is routed through the actual control pilot valve . 4. Pilot valves in the actuator lines control the supply of air or liquid going to the actuators.5. If the pilot valve is opened, water drains from the upper chamber and its pressure is reduced. 6. The difference between PORV and conventional PRV is that pilot valves use system pressure to seal the valve. 7. Both fuel and oxidiser first flowed through a small pilot valve for ignition, before their main valves opened. 8. The pilot valve gives a proportional control over main valve flowrate, with the opening being controlled, slow and gradual. 9. This pilot valve is controlled mechanically from outside the valve chamber and is the main control over the valve position. 10. Pilot valves are often used in critical applications ( i . e ., emergency and safety controls ) and are human-operated.
