METHOD OF MAIN SAFETY VALVE CONTROL, DEVICE FOR IMPLEMENTATION THEREOF, SAFETY DISCHARGE SPECIAL VALVE AND PRESSURE BALANCING SPECIAL VALVE

摘要

FIELD: pipes.;SUBSTANCE: group of inventions relates to pipeline valves and intended for use in safety valves with auxiliary valve development for servo control and other valves for control systems. Method is characterized by fact, that cavity above main safety valve (MSV) piston communicates with protected system at all stages of operation, at MSV opening stage working medium flow in cavity above MSV piston does not exceed value of leakage from it, and pressure in cavity is reduced by value, minimum required to ensure MSV complete opening. At MSV closing stage after termination of working medium discharge from cavity and increasing pressure in it to required level medium inflow into cavity is increasing. In addition to method group of inventions also comprises device, special safety discharge valve and special valve, equalizing pressures.;EFFECT: group of inventions allows creating device for control over main safety valve operation based on simple design special valves, which simplifies pulse device in general.;4 cl, 3 dwg