There is disclosed a valve having a spool sealably slidable longitudinally within a bore in its body between alternate positions for controlling flow of a first fluid between lateral ports connecting with the bore. The spool is urged toward a first position by a force due to a spring arranged within a chamber at one end of the bore, and to a second position by a force due to the pressure of a second fluid acting across a piston reciprocable within a chamber at the other end of the bore. A conical shoulder on a head of the spool engages a conical seat on ...
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