Search International and National Patent Collections

1. (WO2005017287) BACK-UP VALVE FOR PRESSURE-TYPE POOL CLEANER

Pub. No.:    WO/2005/017287    International Application No.:    PCT/IB2004/002644
Publication Date: Fri Feb 25 00:59:59 CET 2005 International Filing Date: Sat Aug 14 01:59:59 CEST 2004
IPC: E04H 4/16
Applicants: VAN DER MEIJDEN, Hendrikus, Johannes
LAMBOURN, Paul
BLAKE, William, Alleyn
Inventors: VAN DER MEIJDEN, Hendrikus, Johannes
LAMBOURN, Paul
BLAKE, William, Alleyn
Title: BACK-UP VALVE FOR PRESSURE-TYPE POOL CLEANER
Abstract:
A back-up valve (10) for a pressure type pool cleaner is series-connected in a water flow line conducting water under pressure to a pool cleaner head. Water flows via an inlet (14), through a generally axial flow turbine (26), and via flow passage sections (32) cyclically, alternatively via a first outlet (16) to the head, and via a second, back-up outlet (18) into the body of pool water. During a major portion of the cycle, flow is directed to the head for normal operation of the head. During a minor portion of the cycle, flow through the back-up outlet reverses the head. The turbine (26) is fully and symmetrically exposed to the flow. The turbine, via a high reduction gear train (28), drives a valve arrangement including a shutter having ports cyclically to direct water flow alternatively to the first outlet (16) and the second, back-up, outlet (18).