(19)
(11) EP 0 310 254 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
30.05.1990 Bulletin 1990/22

(43) Date of publication A2:
05.04.1989 Bulletin 1989/14

(21) Application number: 88308194.5

(22) Date of filing: 05.09.1988
(51) International Patent Classification (IPC)4: F04B 17/04
(84) Designated Contracting States:
AT BE CH DE ES FR GB GR IT LI LU NL SE

(30) Priority: 07.09.1987 GB 8720995

(71) Applicant: FRAMO DEVELOPMENTS (U.K.) LIMITED
London SW20 OAY (GB)

(72) Inventor:
  • Mohn, Frank
    London SW20 0AY (GB)

(74) Representative: Jones, Ian et al
W.P. THOMPSON & CO. Celcon House 289-293 High Holborn
London WC1V 7HU
London WC1V 7HU (GB)


(56) References cited: : 
   
       


    (54) Reciprocating pump unit


    (57) Pump units with reciprocably movable pistons driven by linear electric motors move substantially equal volumes of fluid on each stroke. Two pistons (10,11) can be moved alternately towards and away from each other, or a piston assembly comprising a piston (60;85) is reciprocated in a cylinder (61;82) together with a discharge tube (56;99) extending from the piston into a discharge duct (75;102).







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