(19)
(11) EP 0 374 117 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
23.01.1991 Bulletin 1991/04

(43) Date of publication A2:
20.06.1990 Bulletin 1990/25

(21) Application number: 89850433.7

(22) Date of filing: 12.12.1989
(51) International Patent Classification (IPC)5F04B 49/00
(84) Designated Contracting States:
AT CH DE ES FR GB IT LI NL

(30) Priority: 14.12.1988 SE 8804522

(71) Applicant: HEMO SPRAY & PUMP AB
S-183 30 Täby (SE)

(72) Inventors:
  • Heijmer, Lars
    S-182 46 Enebyberg (SE)
  • Lundberg, Jörgen
    S-161 28 Bromma (SE)
  • Pukk, Priddu
    S-125 32 Älvsjö (SE)
  • Lingström, Göran
    S-133 00 Saltsjöbaden (SE)
  • Molitor, Ulf
    S-644 00 Torshälla (SE)

(74) Representative: Henningsson, Gunnar et al
AWAPATENT AB, Box 45086
S-104 30 Stockholm
S-104 30 Stockholm (SE)


(56) References cited: : 
   
       


    (54) Spray apparatus


    (57) Spray apparatus fo carrier-less high pressure spraying of materials, for example mortar, comprising a pump housing (31) having an inlet (9) for the material with an associated non-return valve (13), and having an outlet (11) for the material with an associated counter-placed non-return valve (23), and pressure means (41) generating alternately pressure and suction for pressurizing and feeding the material. The spray apparatus further comprises a mobile piston (43), which is placed under a determined but adjustable counter-pressure, so that when a pre-selected pressure has been generated in the pump housing (3) this pressure will be maintained at a constant level by displacing the mobile piston (45) outwardly so as to increase the dead volume (51) of the pump housing.







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