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Precautions should be taken when touching gasket between body and valve bonnet. The gasket contains stainless
steel stripe that may cause injury,
Gasket
Everytime when valve bonnet was disassembled sealing surface should be cleaned. During assembly it should be applied new
gasket of the same type as previously used. Body-bonnet bolt connections should be tighten when the valve is at open position.
The bolts should be tighten evenly and crosswise by torque wrench.
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Tighten torques
Ś
crew
Torque
M8
15-20 Nm
M10
35 -40 Nm
M12
65 – 70 Nm
M16
140 -150 Nm
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before valves re-assembly in the pipeline it is necessary to check valve operation and tightness of all connections.
Tightness test should be carried out with water pressure of 1,5 nominal pressure of the valve.
