C5 Flush valves · Installation | 795 Gem Installation, use and maintenance General characteristics Installation Flush valves are high-delivery cocks that It is essential that all supply pipes be shut off automatically, taking over the thoroughly flushed, allowing water to run function of high -or low- level cisterns before the Flush Valve is installed. traditionally used. They are fitted with a The supply pipe must be R 1”. handle which, when operated, produces The tail-piece between the control a flow of water. They remain open for a stop and the body of the Flush Valve is short time and then shut off automatical- designed to compensate for “off centre” ly after delivering a vigorous high speed roughing-in on the job. Adjustment rang- flush. Flush valves may be installed on es from 110 mm minimum to 135 mm slop-hoppers or WC bowls: in the latter maximum . case, the corresponding Vacum Breaker Installation valve is supplied as an option. The Flush Valve should be cleaned with They are specially recommendable for a liquid detergent or soapy water. The installation in hospitals, clinics, factories, use of products containing acids or offices and public places in general. The abrasive detergents may damage Flush installation of a Flush Valves in any build- Valve components. ing offers, amongst others, the following Use a sponge, chamois-leather or a soft advantages: cloth. Do not use scourers of any kind. a) More available space, as in many In case of frost, empty the system and cases the WC bowl may be installed operate the handle of the Flush Valve closer to the wall. several times. b) It may be used again just a fey sec- Should the calibrated bypass valve (9) onds after flushing. get clogged, proceed as follows: first c) They require practically no attention or shut water off by means of screw (12), maintena nce. then remove cover (1) using a 51 AF Non-hold-open spanner. Next, lift off discharge piston (3) This feature allows the Flush Valve to and O-ring. After that, use a 0.3 mm dia. perform its intented flushing cycle and steel wire to clear the hole. shut off automatically regardless if the Technical data handle is held down continuously or not. Technical data GEM Flush Valve Furthermore line water pressure fluc- Nominal diameter 1” tuations will not affect the Flush Valve Recommended performance, and so the total quantity of minimum pressure 1 kg/cm 2 water d elivered will remain unchanged. Flush time between 11 and 17 s Angular check-valve Flow rate between 1 and 1,5 l/s Angular check-valve employs a seat Total volume per flush 9 l plug, loose on a stern and held against the stop seat by a light spring. When the Flush Valve is activated, water pressure moves the seat plug off its seat. Water cannot be siphoned from the valve.