A spring is supported on {TAIL ~ the counterholder} and is intended for prestressing a closing part against {HEAD ~ a valve seat} 
A spring is supported on { TAIL ~ the counterholder } and is intended for prestressing a closing part against { HEAD ~ a valve seat }
OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD