(19)
(11) EP 0 851 053 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
15.09.1999 Bulletin 1999/37

(43) Date of publication A2:
01.07.1998 Bulletin 1998/27

(21) Application number: 97307867.8

(22) Date of filing: 06.10.1997
(51) International Patent Classification (IPC)6: D06B 5/12, D06B 23/00
(84) Designated Contracting States:
AT BE CH DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE
Designated Extension States:
AL LT LV RO SI

(30) Priority: 31.12.1996 GB 9627105

(71) Applicant: Falmer Investments Limited
Road Town, Tortola (VG)

(72) Inventors:
  • Clifford, Frank Graham
    Stanley, N C 28164 (US)
  • Tsui, William
    Sale, Cheshire M33 2DW (GB)

(74) Representative: Purvis, William Michael Cameron et al
D. Young & Co., 21 New Fetter Lane
London EC4A 1DA
London EC4A 1DA (GB)

   


(54) Apparatus and method for monitoring and controlling liquid flow rate


(57) To control rate of liquid flow, particularly dyebath turnover utilising a reverse valve, liquid is circulated in a circulating system using a pump motor set comprising a centrifugal pump driven by an electric motor, which pump motor set has a relationship between motor current and liquid flow rate which is both substantially linear and significantly inclined, the rate of liquid flow being determined from the motor current consumed.






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