The diaphragm 4 is moved with a suction stroke in {HEAD ~ direction B} and a delivery stroke in direction C by means of a hydraulic fluid contained in a working chamber 9, that also includes {TAIL ~ a conventional device} 10 for compensating leaks 
The diaphragm 4 is moved with a suction stroke in { HEAD ~ direction B } and a delivery stroke in direction C by means of a hydraulic fluid contained in a working chamber 9 , that also includes { TAIL ~ a conventional device } 10 for compensating leaks
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 OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH