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As been depicted in the diagram when the flow comes below the valve lid, the fluid will lift the lid and pass but when the flow is in reverse direction the lid will sit on the seat and stop the flow.
On the other hand when the spindle is screwed down the lid will not open in any case. This is what is called SDNR and screw down lift valve.
b) Quick closing valves are fitted in Lube Oil and Fuel oil lines, generally at the tanks on the lines which take the suction from those tanks. It is used to cut-off the oil flow to those line in case of fire.
It could be mechanically or pneumatically activated and when activated it shuts the valve. The shutting of the valve is achieved by collapsing the bridge of the valve which has internal threads on which the treaded spindle of the valve move up and down.
Thus if this internal thread (fitted in the bridge of the valve) itself is brought down it will shut the valve even if it is in open condition.
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