Aylesbury Keraflo KB Type Standard Flow 0" (25mm) - Fully variable delayed action

Benefits of Keraflo''s Aylesbury Float Valve Range:

• Maintenance Free
• Designed to operate for long periods without maintenance.
• Backsiphonage Protection
• 'Up and Over discharge' to BS1212 part 2
• Helps to facilitate Air Gap compliance.
• Extended Durability
• Non-wearing ceramic disc seal in a DZR brass housing
• Virtually Indestructible
• The heart of the valve incorporates pressure compensated rotating ceramic discs which are aligned in the open position.
• Revolutionary Shaped
• Puncture Proof Float, made from Polyethylene closed cell foam which is CFC free air retardant and chemically and biologically inert.
• This radical design virtually eliminates stress on the tank wall fixing point.
• Water Pressure: Suitable for 0 -10 Bar.
• Temperature Range: 1 - 60C.
• Ideal for pumped systems
• Reduces Legionnaire risk
• Saves energy with positive pump control
• No valve bounce
• Maximises tank capacity
• No dribble
• No water hammer
• Full flow during fill

Aylesbury Keraflo 'KB' Type

Fully Variable Delayed Action Float Valve

Fully variable opening and closing operating differential of up to 1820mm

Suitable for tanks with or without raised valve chambers

The valve is operated by a transfer of weight in an actuator tube which causes the valve to open or close.

The arrangement of the float and buoy assembly produces a delayed change of balance in the actuator as the water level alters. The total assembly is relatively light with no pressure related stresses. As a result the valve does not require any supporting structure.

Aylesbury 'KB' Type valves have a variable delayed action and feature a chain in place of a rigid float arm enabling virtually unlimited opening and closing levels. This allows for a considerable drop from the valve to the water level, overcoming issues associated with drop arms.

The versatility of the Aylesbury 'KB' Type makes it suitable for installation either directly into a tank or into a raised valve chamber particularly where Air Gaps are required. Changes in water levels and differentials can be made quickly by the installer or maintenance engineer without tools. This feature is particularly useful where water demand changes either due to seasonal factors, building occupancy or where the commissioning of a facility is phased, as it reduces the risks associated with excess water being stored for too long.

Applications
 

• This unique valve is ideal for use with pumped systems, water treatment plants and many other applications including:
• Industrial tanksRain (grey) water tanks and reservoirs
• Pumped systemsIndustrial feed and expansion tanks
• Underground tanksProcess tanks
• The flexibility of 'KB' valves can assist with improving water quality where buildings are partially commissioned or occupancy varies, at different times of the year.

Air Gaps for Industrial Tanks
The 'KB' Type is ideal for fitting into a tank without a lid or raised valve chamber and where the vertical drop from the valve to the water level may be considerable.

Pumped Systems
The adjustable and potentially large difference between opening and closing levels can allow a large volume of water to be admitted to the tank each filling cycle. Pumps and pump sets are often controlled to run for a minimum of 3 minutes. If the water demand is satisfied before this time and an auxiliary hydraulic accumulator is not fitted, the pumps will run against a closed valve at zero efficiency. The fill volume can be set to equal or exceed this volume to ensure the pump/s run for at least 3 minutes. Where a pump set is used solely for transferring water from a break tank to an elevated storage tank the 'KB' Valve can dispense with the need for an auxiliary hydraulic accumulator. Pump efficiency and initial sizing can be further enhanced using a float valve with little internal resistance. Consequently the High Flow version is often better suited to these applications than the Standard Flow version which is ideal for mains water pressure applications.

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