The present invention relates to a valve for providing an adjustable loss of head by {HEAD ~ means} of {TAIL ~ a mobile perforated plate} which slides over a stationary perforated plate 
of
The present invention relates to a valve for providing an adjustable loss of head by { HEAD ~ means } of { TAIL ~ a mobile perforated plate } which slides over a stationary perforated plate
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH