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