control valves to standard control valves not to standard (solenoid and pneumatic) coils and connectors plate for valves manual and mechanical valves ancillary valves ball valves with actuator airline equipments and pressure-gauges modular air-line equipment and soft-start valves microregulators mounting...
are composed of a "pilot valve" and a "main valve", differently from spring-loaded safety valves , the pressure is monitored and adjusted by the pilot valve, not the main valve. pilot-operated safety valves are widely used for large size valve and high-pressure applications, which need lager torque...
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