{HEAD ~ The slide valve} includes a pre loaded spring, capable in the absence of other force of moving the slide valve to its closed position to lock the member against {TAIL ~ movement} 
{ HEAD ~ The slide valve } includes a pre loaded spring , capable in the absence of other force of moving the slide valve to its closed position to lock the member against { TAIL ~ movement }
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL