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How to set the boiler safety valve ?

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  • How to set the boiler safety valve ?

    How to set the boiler safety valve ?

  • #2

    Setting of Safety Valves (How to set safety valve setting under steaming condition?)

    1. Take Standard Pressure Gauge for accuracy.

    2. Fill up water up to 1⁄4 of Gauge Glass level, and shut Main Stop Valve, Feed Check Valve.

    3. Without Compression Rings, Hoods and Easing Gears, reassembled the Safety Valves with spring compression less

    than previous setting.

    4. Raise boiler pressure to desired blow-off pressure.

    5. Screw-down Spring Compression Nuts of any lifting valves, until all are quiet.

    6. Adjust each valve in turn:

    a) Slacken Compression Nut until valve lifts.

    b) Screw-down Compression Nut sufficiently enough, so that when valve spindle is lightly tapped, valve returns to its

    seat and remain seated.

    c) Measure gap between Compression Nut and spring casing.

    d) Make a Compression Ring equal to this gap, and insert under Compression Nut.

    e) Gag the Spindle of this Safety Valve, to prevent opening, while remaining valve is being set.

    7. Remaining valve is again set and insert Compression Ring.

    8. Remove gag and retest both valves to lift and close together.

    9. Caps and Cotter Pins padlocked.

    10. When the Surveyor satisfied the setting pressure, Easing Gear should be tested.

    11. All Safety Valves set to lift at not less than 3% above approved working pressure (design pressure).