{HEAD ~ Another object} of the invention is to provide {TAIL ~ a valve device} which is simple, reliable and less sensitive to clogging 
is to provide
{ HEAD ~ Another object } of the invention is to provide { TAIL ~ a valve device } which is simple , reliable and less sensitive to clogging
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH