AYLESBURY™ 'K' TYPE FLOAT VALVES

SIZES (DN): 2”(50)HF, 2½”(65)SF & 3”(80)RB

PLEASE PLACE LABEL ON TANK LID ABOVE VALVE FOR FUTURE REFERENCE.

PRE-INSTALLATION CHECKS AYLESBURY Valves are unlike any other float operated valve, ballcock or ball valve. Please read these instructions and refer to drawing 2 K HF 50mm sheets 1-4 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. Aylesbury Valves are suitable for most cold water storage tanks. Please note the following:

RAISED VALVE CHAMBERS:

K Type Valves are not generally suitable for raised valve chambers - use either KAX or KB Types.

OPERATING SPACE: Check for sufficient clearance. The working dimensions are shown on the attached drawings.

OVERFLOW/WARNING PIPES:

Check the position of the Overflow (where fitted) and Warning Pipe. See drawing Ki083* for Closing Level (TWL) range and the pipe positioning.

TURBULENT WATER: 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.

FLANGED TANKS: The design of the Aylesbury 'K' Type valve, allows sufficient clearance between the floats and most internal tank flanges and ribs. The valve Backnuts may be adjusted to enable fitting to tanks with large flanges; provided a minimum of 25mm exists between the Float and tank wall throughout the arc of the Float.

ROUND TANKS: Minimum tank diameters required:

Valve 2”HF 2½”SF 3”RB Min tank diameter (m) 1.80m 1.80m 1.80m

SLOPING TANK WALL: Ideally, the wall to which the Aylesbury K Valve is to be attached should be vertical. If the wall around the fixing hole is sloped each individual Valve needs to be aligned as described in the installation instructions.

PIPEWORK SUPPORT 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.

AYLESBURY™ 'K' TYPE FLOAT VALVES

SIZES (DN): 2”(50)HF, 2½”(65)SF & 3”(80)RB

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 LEVELS MUST BE USED TO ALIGN THIS VALVE. FAILURE TO FOLLOW THE PROCEDURE LISTED BELOW WILL PREVENT THE VALVE OPERATING CORRECTLY

The valve is supplied with the float arm assemblies detached. To avoid damage it is recommended, for most installations, to fit the Float Arm Assemblies after installing the Valve in the tank. REFER TO DRAWINGS DURING INSTALLATION

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 clips from both bodies.

3 Remove and discard the protective Caps from the Tail and discharges. Remove and retain one inlet

Backnut. Insert the Valve Tail through the hole in the tank wall observing the side of the Tee marked TOP. Replace the Backnut with the flanged side against the tank wall.

4 Level the two valves on the Tee joint by placing a spirit level across the Tee parallel to the tank wall on

which it is mounted and twisting the whole assembly to bring the valves level. Tighten the backnuts sufficiently to hold the assembly in position but note that it may be necessary to move them later after the float clearances have been measured.

5 Fit the Float Arm Assemblies and Floats as shown in drawing Ki084 ensuring that Float Arm operating pins

engage in the holes of the actuator wheel and the float marked with a red dot is fitted to the Valve which is also marked with a red dot.

6 The Float Arms must hang vertically with the built-in spirit level bubbles exactly between the black lines as

shown in drawing Ki083*. If either spirit level does not indicate level the individual valves may be rotated on their screwed connection to the Tee. These joints are sealed by O rings and may be moved without fear of leaks. Loosen the backnuts on the Tee and rotate each Valve individually as necessary so that the Float Arms are ABSOLUTELY VERTICAL. Align each valve, tighten the backnuts, and re-check the alignment. Each bubble must be precisely between the black lines.

7 Check that the clearance between the tank wall and the floats is at least 25mm. If it is less than this move

the assembly further into the tank by adjusting the backnuts and repeating steps 4 and 6. When the clearance and the levels are correctly set fully tighten the backnuts holding the assembly to the tank wall.

8 Using the supplied 4mm allen key, remove the two M5x12 screws from ends of the Float Link Bar prior to

fitting. Place the bar between the lowest holes of the two float arms and attach using the screws previously removed, as in drawing Ki084*. Tighten using the allen key ensuring that the float arms remain parallel.

9 Connect the supply pipe via a servicing valve and hand tighten the connection Backnut 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 Ki086* DO NOT USE A WRENCH ON ANY OTHER PART OF THE VALVE.

ALIGNMENT WARNING!!

It is imperative that the Float Arm is fitted in the vertical position when the Valve is fully open. This is critical to the operation of the Valve.

AYLESBURY™ 'K' TYPE FLOAT VALVES

SIZES (DN): 2”(50)HF, 2½”(65)SF & 3”(80)RB

ADJUSTING CLOSING WATER LEVEL (TWL)

1. Pull out the Float Adjusting Catches. Refer to drawing Ki084*. 2. Move the Floats to the desired position. 3. Release Catch and ensure Pin locates in desired hole. 4. Ensure that both floats are set to the same level. 5. The delayed action (level differential) is the difference between the Opening and the Closing Levels. This

will be between 125 and 166mm and is not adjustable.

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.

ATTACHED DRAWINGS Ki083* Aylesbury K Type Dimensions – Side View Ki084* Aylesbury K Type Dimensions – Front View

KERAFLO RESERVE THE RIGHT TO CHANGE SPECIFICATIONS, DESIGN AND MATERIALS WITHOUT PRIOR NOTICE

Dan Macey

1