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