. It consists of a disc valve with a spring fitted to the top , screwed down sufüciently tight to resist the steam pressure acting on the internal area of the valve . The valve can only be opened , and the water which is not com - pressible ejected , by the piston striking against the water , and… … scattered about the engine room , and Fig . 281 . — Relief Valve with movable Crosshead . sealding the engineers or those in at - a . Valve and spindle . b , Valve seat . tendance . The spring is usually screwed Spring , d , Crosshead . e e , Columns . f , Baffle piece . down with a crosshead ,…
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