boiler stop valves. the disc requires guide vanes or a stem to keep it concentric with the seat when open. the greatest lift required is one-quarter of the bore; guides must be of a greater length than the lift. figure : example of a globe valve with (inset) detail of the valve arranged as a screw-down non-return...
boiler stop valves. the disc requires guide vanes or a stem to keep it concentric with the seat when open. the greatest lift required is one-quarter of the bore; guides must be of a greater length than the lift. figure : example of a globe valve with (inset) detail of the valve arranged as a screw-down non-return...
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