Principles of operation£º
In the normal closed position, system pressure is transmitted
through the pilot and into the dome of main valve. The
pressure above the main valve disc generates a net
downward force, hold the main valve closed.
When system pressure reaches the set pressure, the pilot
spindle lifts and reseat piston closed simultaneously,
venting the dome pressure through the pilot to
atmosphere£¬then the dome pressure of main valve is
dropped sharply, allowing the main valve to open fully,
venting the pressure through the main valve.
When the desired system pressure is achieved,
the pilot spindle snaps closed simultaneously, and the
system fluid repressures the dome and closes the main
valve .
Performance:
¡ñ Size£º1" D 2"~8" T 10"
¡ñ Class£º150 lb~2500 lb
¡ñ Temparature£º-29¡æ~ +260¡æ
¡ñ The allowable tolerance of the set pressure ¡Ü ¡À 3% of the set pressure.
¡ñ Overpressure : ¡Ü 10% of the set pressure.
¡ñ Blowdown : ¡Ü 10% of the set pressure.
¡ñ Tightness: The valves have good seat tightness conforms to API Std 527
Features
¡ñ It opens in proportion to the overpressure to minimize product loss and reduce noise.
¡ñ Reduces shock loads on vessels and piping due to valve actuation.
¡ñ The system can be operated nearer set pressure without valve leakage.
¡ñ The soft seat design provides good seat tightness before and after each relief cycle.
¡ñ Proper valve operation and lift are unaffected by back pressure.
¡ñ Non-flowing pilot reduces product loss and environmental pollution.
¡ñ The pilot exhaust is piped to the vent pipe line without being influenced by the back pressure
¡ñ Quick simple verification of set pressure while valve remains in service.
