MSV

リヒーター安全弁

Three solenoid bypass valves (SBE) are provided between the upper and the lower piston chamber of the hydraulic actuator. Deenergizing one of these solenoid valves opens a flow path between the piston chambers and allows the steam pressure to open the safety valve. Due to the operating principle, the valve can be used with back pressures up to 0.5 x inlet pressure without influencing capacity or trip pressure.

減圧処理を経てバルブが再び閉じ、別のソレノイド弁APLに油圧油を通すことで閉じたままになります。油圧アクチュエータからの高圧で、何年ものプラント運転においてバルブの機密性が保たれます。

3つの冗長な圧力スイッチがシステムの圧力を感知し、減圧処理のトリップ信号を提供します。安全制御キャビネットSCには、ソレノイド弁を作動させるのに必要なリレーのほか、安全弁の機能を定期的にテストするためのテスト用ロジックが含まれています。ひとつの安全キャビネットに最大4つのパラレル安全弁を接続できます。

• Forged and bolted design with inlet separate from outlet.
• Material change between inlet and outlet is easily implemented.
• Backseat seals gland during the relief operation.
• Double acting hydraulic actuator to keep valve completely tight during the normal operation.
• Hydraulic power operated, to ensure high seat sealing force for constant tight shut-off.
• No spring required, steam pressure opens the valve.
• Three solenoid bypass valves are provided per actuator for redundancy.
• Complete system is type tested and has a type approval number from TÜV.