MAIN STEAM RELIEF SAFETY VALVE

• Main Authors: TOKUNAGA TAKASHI, IWANAGA MASAKAZU, TANAKA NOBUHIKO, HAMADA NOBUYOSHI, KUROSAKI TOSHIKAZU
• Format: Patent
• Language: English
• Published: 11.05.2001
• Edition: 7
• Subjects: ACTUATING-FLOATS; BLASTING; COCKS; DEVICES FOR VENTING OR AERATING; ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; HEATING; LIGHTING; MECHANICAL ENGINEERING; METHODS OF STEAM GENERATION; NUCLEAR ENGINEERING; NUCLEAR PHYSICS; NUCLEAR POWER PLANT; NUCLEAR REACTORS; PHYSICS; REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGYGENERATION, TRANSMISSION OR DISTRIBUTION; STEAM BOILERS; STEAM GENERATION; TAPS; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE; THERMAL INSULATION IN GENERAL; VALVES; WEAPONS

PROBLEM TO BE SOLVED: To provide a main steam relief safety valve for preventing the deterioration of a piston seal ring and long in service life. SOLUTION: A shielding plate 19 almost perpendicular to a valve stem 3 is provided on a cooling spool 15. Otherwise, a radiation fin 21 is provided on a pillar 20 of the cooling spool, provided almost parallel to the valve stem. Otherwise, a heat insulator 22 is provided between a piston guide 14 in sliding contact with the inside of a piston 5 mounted inside the case 7 of an actuator 1 and the valve stem.