Global Patent Index - EP 0942171 A3

EP 0942171 A3 20000209 - Double diaphragm pump

Title (en)

Double diaphragm pump

Title (de)


Title (fr)

Pompe à membrane double


EP 0942171 A3 (EN)


EP 99201777 A


  • EP 97302476 A
  • US 1565096 P
  • US 83723797 A

Abstract (en)

[origin: EP0942171A2] An air operated double diaphragm pump 10 is provided with an air valve assembly which allows the valve cup 38 to move in a rectangular pattern which greatly reduces the cost and number of parts required for such an air valve. The main housing 12 of the pump 10 is mounted on a fluid base 20 to which the lines of fluid are attached. This allows removal of the pump for servicing by undoing several basic fasteners such as nuts and bolts 18 without requiring removal of the fluid fittings to the base 20. Thus, in the event of a pump malfunction, the pump may be easily replaced while the fluid fittings remain intact. Provision is also made for additional passages 54, 56 into each air chamber 44, 46 for operation via an externally operated solenoid valve. A one-piece check valve 26 construction is utilised with the part having a central sealing disk 26A having a plurality of radially axially extending guide members 26B extending therefrom wherein each of the guide members has an outer diameter sized to slidingly fit within a cylindrical cavity 28 and each of the guide members 26B having axially opposite the sealing disk 26A a plurality of spring loaded fingers 26D which serve to bias the check valve 26 into a closed position. <IMAGE>

IPC 1-7

F04B 43/073; F04B 9/135; F16K 15/02

IPC 8 full level

F04B 9/135 (2006.01); F04B 43/073 (2006.01); F04B 53/16 (2006.01); F04B 53/22 (2006.01)

CPC (source: EP)

F04B 9/135 (2013.01); F04B 43/0736 (2013.01); F04B 53/16 (2013.01); F04B 53/22 (2013.01)

Citation (search report)

Designated contracting state (EPC)


DOCDB simple family (publication)

EP 0942171 A2 19990915; EP 0942171 A3 20000209; EP 0942171 B1 20030702

DOCDB simple family (application)

EP 99201777 A 19970411