Diaphragm pump

A diaphragm pump comprised of at least three plates, one of which is a middle plate (203) and two of which are outer plates (201, 205), the middle plate being disposed between the two outer plates, said at least three plates forming at least one pumping chamber (211), at least two shut-off chambers, said at least two shut-off chambers being a first shut-off chamber (210) and a second shut-off chamber 212), each of said pumping and shut-off chambers being in the form of a spherical segment, a spherical zone, a cylinder or a truncated cone;

• said middle plate being separated from each of said outer plates by two diaphragms (202, 204) which diaphragms also divide said pumping and shut-off chambers into control spaces (220, 221, 222) and product spaces (230, 231, 232), the product space (231) of the pumping chamber being connected to the product space (230) of said first shut-off chamber (210) by a first connecting duct (208) having an orifice (241) opening into said pumping chamber, and to the product space (232) of said second shut-off chamber (212) by a second connecting duct (209) having an orifice (243) opening into said second shut-off chamber, with an outlet duct (206) connected to the product space (232) of second shut-off chamber (212) through an outlet orifice (244), an inlet duct (207) connected to the product space of first shut-off chamber (210) through an inlet orifice (240);
• said pumping chamber (211) and shut-off chambers (210, 212), together with outlet duct (206) and inlet duct (207), first connecting duct (208) and second connecting duct (209) forming a passage duct through said pump, said control spaces (220, 221, 222) being connected to a control unit (100, 115) by control lines (119, 120, 121).