PRE-INSTALLATION CHECKS AYLESBURY Valves are unlike any other float operated valve, ballcock or ball valve. Please read these instructions and refer to attached drawings before installation. Installation of valves should be in accordance with The Water Supply (Water Fittings) Regulations 1999 and BS6700:1997 Para. 2.2.4 Keraflo Valves contain a pair of maintenance free ceramic discs. Do NOT attempt to dismantle the Valve - even if you are curious! Should the Valve ever become blocked with debris, ask Keraflo for a Service Bulletin. EVIDENCE OF DISASSEMBLY OR SIGNS OF MISUSE MAY INVALIDATE WARRANTY. OPERATING SPACE: CHAIN LENGTH: OVERFLOW/WARNING PIPES TURBULENT WATER: FLANGED TANKS: ROUND TANKS: Check for sufficient clearance - see dimension sheet Ki010* and Ki014* for working dimensions. Do not cut or shorten the Stainless Steel Chain - its weight is critical. Likewise do not add weight by lengthening. Check the position of the Overflow and Warning Pipe (where fitted). See drawing Ki010* for closing water level (TWL) range. Exceptionally turbulent waters, eg: cooling towers, should be avoided directly beneath the float. Calming measures such as baffle plates, still ponds etc. should be implemented. The design of the Aylesbury 'KB' Type valves, sizes ¾ (20), 1 (25), 1¼ (32) and 1½ (40)SF allow sufficient clearance between the Float and a 70mm internal flange/rib. Sizes 1½ (40)HF and 2 (50)SF, allow sufficient clearance between the Float and a 45mm internal flange/rib. The Valve Backnuts may be adjusted to enable fitting to tanks with larger flanges; provided a minimum of 20mm exists between the Float and tank wall throughout the arc of the float. Minimum tank diameters required: Valve ¾ 1 1¼ 1½ SF 1½ HF 2 SF Min tank diameter (m) 0.50m 0.50m 0.60m 0.60m 0.80m 0.80m SLOPING TANK WALL: PIPEWORK SUPPORT: The wall to which the Aylesbury Valve is to be attached must be vertical. If the wall around the fixing hole is sloped, tapered washers must be used. These are generally available from the tank supplier. Aylesbury Valves create virtually no tank wall stress. Additional pipework support is therefore unnecessary; provided the Code of Practice for the support of pipework in general is met. SERVICING VALVES: A servicing valve must be fitted as near as is reasonably practicable to the float operated valve. A servicing valve incorporating a particle strainer is highly recommended. PLEASE PLACE LABEL ON TANK LID ABOVE VALVE FOR FUTURE REFERENCE.
INSTALLATION INSTRUCTIONS Installation of valves should be in accordance with The Water Supply (Water Fittings) Regulations 1999 and BS6700:1997 Para. 2.2.4 WARNING! THE BUILT-IN SPIRIT LEVEL MUST BE USED TO ALIGN THIS VALVE. FAILURE TO FOLLOW THE PROCEDURE LISTED BELOW WILL PREVENT THE VALVE OPERATING CORRECTLY REFER TO DRAWINGS DURING INSTALLATION To avoid damage fit the Actuator Tube after installing the Valve in the tank. 1 Before fitting the Valve, flush the supply pipes to clear all debris. Tanks and pipes should be disinfected using the procedures in BS 6700:1997 Para 3.1.10 2 Remove and retain the Double R Clip and Actuator Lever from the Valve Body. 3 Remove and discard the protective Cap from the Tail. Remove and retain one Backnut. Insert the Valve Tail through the hole in the tank wall, replace the Backnut with the flanged side against the tank wall. 4 Connect the supply pipe, via a servicing valve, then hand tighten Backnuts to suit. To prevent the Valve turning when tightening the pipe fitting, use either a wrench or a spanner on the Valve Tail where indicated in drawing Ki014*. DO NOT USE A WRENCH ON ANY OTHER PART OF THE VALVE. 5 Fit the Actuator Tube over the Spigot. The Hanger must be on the right as shown in drawing Ki010*. 6 Fit the Actuator Lever over the Spigot and push its Pin through the bracket on the Actuator Tube and into the hole in the Black Wheel behind. Place a finger or thumb through the loop in the Double R Clip, then push the Clip into the Groove in the Spigot until it clicks into place. 7 The Actuator Tube will be tilting down to the left (brass end lowest). NOTE: the chain is not connected at this stage. Rotate the Tail of the Valve with a wrench until the Spirit Level indicates ABSOLUTELY level. (The Actuator Tube is actually angled 26º from horizontal). Tighten Backnuts then check alignment again. The bubble must be precisely between the black lines. 8 Remove and discard the protective Cap from the Discharge Assembly. 9 Hang the chain on the Hanger. The length of this chain determines the opening water level - see "ADJUSTING OPENING WATER LEVEL (LWL)" below. 10 Position the Closing Float Assembly along the chain to the required closing water level. Hook the Float Adjusting Peg THROUGH the required loop in the chain - see "ADJUSTING CLOSING WATER LEVEL (TWL)" below. Refer to drawing Ki010* ADJUSTING OPENING WATER LEVEL (LWL) The Valve will open once the water level has dropped far enough to expose most of the Opening Buoy. When the Actuator Tube is held horizontal, the groove in the Opening Buoy indicates the exact opening water level. Adjust the length of the chain with the Hanger. Loop the excess chain into the Hanger as shown in drawing Ki014*. DO NOT CUT OR REMOVE ANY CHAIN, ITS WEIGHT IS CRITICAL. The standard length of chain enables a lowest open level of 2000mm. A longer chain (factory fit option only) is available upon request. P/KBINSTALL/04-08 Page 2 of 5 KBInstall
ADJUSTING CLOSING WATER LEVEL (TWL) When the Actuator Tube is held horizontal, the closing water level is indicated by the base of the Closing Float. Drawing Ki010* also shows the closing water level in relation to the Closing Float when the valve is in the closed position. The highest achievable closing water level is shown in drawing Ki010* (Dimension Jmin). This can be achieved by having no spare chain links between the Hanger and the Float Adjusting Peg. The lowest closing water level (Dimension Jmax) can be achieved by having the float touching the top of the Opening Buoy whilst using all of the available chain (last link on Hanger). Position the Float Assembly along the chain to the required closing water level. Hook the Float Adjusting Peg THROUGH the required loop in the Chain. Applications where the Top Water Level (TWL) can rise after the Valve has closed will cause the Chain to become slack. A cable tie/ratchet strap should be fitted over the Float Adjusting Peg in such a way as to prevent the chain from slipping off. Ensure the Chain cannot become entangled with tank tie bars etc. DELAYED ACTION (LEVEL DIFFERENTIAL) The delayed action (level differential) is the difference between opening and closing water levels. This is adjustable between Pmin (Float touching top of Opening Buoy) and Pmax (Float Adjusting Peg almost touching Hanger whilst using all of the available chain) on drawing Ki010*. TESTING Before leaving the installation, test the Valve operation a number of times ensuring the Valve moves freely from the open to the closed position and from the closed to the open position. Where a Valve has not been in operation for a period of time it is also recommended that the above procedure is carried out. Ki010* Ki014* ATTACHED DRAWINGS Aylesbury KB Type Dimensions Front View Aylesbury KB Type Dimensions Side View KERAFLO RESERVE THE RIGHT TO CHANGE SPECIFICATIONS, DESIGN AND MATERIALS WITHOUT PRIOR NOTICE. KBInstall
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