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Slide 60 of 69
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The requirement is to produce a reliable, robust and safe valve chest for the operation of mine roof support hydraulic jacks. When made from steel the amount of pre-machining from bar stock is extensive, the finish machining time extended and there is also a need to send out the components for protective plating. High tensile brass is supplied to the required shape, is relatively easy to machine and requires no plating in order to be safe for this application.