Safety Valve

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NS255-F Series Safery-Relief Valves

Structure and Type

The structure of NS 255F Series full bore safety valve is shown as follows. Types of bonnet, valve disc and nozzle are classified according to service conditions (pressure and temperature) and size, as tabulated in the following page.

Bonnet Structure Yoke Type Spring contained in a yoke structure.
Pillar Type Spring contained in a pillar strucrure.
Type of Disc Standard Disc Flexible disc with flat seat.
Super Disc Flexible disc with elastic lip.
Type of Nozzle Semi Nozzle For set pressure 2.2MPa and under.
Full Nozzle For set pressure over 2.2MPa.