A pump 1, wherein {HEAD ~ the sheet} is in {TAIL ~ the shape} of a substantially spherical or conical cap complementary to the inside surface of the side plate so as to fit against it as closely as possible, with the convex side of this shape facing towards the inside of the chamber 
is in
A pump 1 , wherein { HEAD ~ the sheet } is in { TAIL ~ the shape } of a substantially spherical or conical cap complementary to the inside surface of the side plate so as to fit against it as closely as possible , with the convex side of this shape facing towards the inside of the chamber
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH