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Aylesbury 'KP' Type



Each of our Aylesbury ‘KP’ type float valve kits available here at Keraflo comprises an in-line control valve together with an Aylesbury ‘KB’ type float valve acting as a pilot. The pilot valve offers fully variable delayed action opening and closing water level settings, making this ideal for mains or pumped systems.

Other standout features of our Aylesbury ‘KP’ type float valve kits include the following:

High Kv Value

The standard ‘KP’ Control Valve offers excellent flow rate performance.

Raised Valve Chamber

Can be small as it only has to accommodate a 3/4” KB valve and discharge assembly.

Facilitates Air Gaps

The Aylesbury ‘KB’ Valve is supplied with a 2m long adjustable chain as standard allowing the closing level to be set below any combination of Weir Slot, Overflow and/or Warning Device.

Quiet Operation

Aylesbury valves are quieter than conventional valves due to the elimination of Water Hammer, Valve Bounce, “Hiss” and Dribble.


An externally mounted Control Valve can be easily - inspected, adjusted and – if required – serviced. Re-chlorination of the tank is not necessary provided the tank lid is not removed.

Optional Extra

Upstream Pressure Sustaining Regulator - the Control Valve regulates itself to leave the desired minimum upstream pressure (Adjustable 1 - 6 Bar). This can also be used to provide a constant flow rate.


Below you will find sales literature for our Keraflo Aylesbury valves together with our Keraflo Product Guide and Keraflo Specification Guide - all available for download.


Find out more about our Aylesbury ‘KP’ type float valve kits by getting in touch with our skilled team today. To ensure your technology keeps functioning optimally for longer, be sure to also order from our range of spares for Aylesbury ‘KB’ type float valves.

Please click here to find out more about our electronic Tanktronic tank management system that monitors water levels, temperature and manages & controls tank filling. 

The Tanktronic tank management system now has a new product range addition: the Keraflo Tanktronic Servo Ceramic Valve (SCV) which is a compact precision-engineered valve, for unique motorised filling of cold water storage tanks that brings greater control to the system.


Technical Information
Sizes for 'KP' Type Fully Variable Delayed Action Float Valve Kit
  • No Water Hammer
  • Full Flow During Fill
  • Maximises Tank Capacity
  • Maintenance Free
  • No backing plate required
  • Suitable for all types of Air Gap applications
  • No Valve Bounce
  • No Dribble
  • Delayed Action
  • Tank Wall Stress negligible
  • Ideal for Fire Sprinkler Systems
Flexibility and ease of Installation

Conventional Float Valves above 3” are heavy and cumbersome often necessitating a two person installation. When the ‘KP’ Control Valve is mounted outside the tank at floor level, no heavy lifting is required.

The Control Valve can be mounted in one of four positions:

  • Vertically in the pipe work (preferred option)
  • Outside the tank at floor level
  • Outside the tank above the tank water level
  • Inside the tank above the tank water level
Multiple Discharges

To reduce the risk of stagnation, two or more discharges can be connected to the outlet of the control valve. Since the Filling Pipe is only subjected to low pressure, thin wall PVC pipe can be used. The ‘KP’ Valve can also be configured to service twin/partitioned tanks.

Shallow Tanks

‘KP’ Valves can operate in tanks as shallow as 1 metre in depth.

Deep Tanks

The standard Aylesbury ‘KB’ Pilot valve enables an opening level 2m below the inlet level. A longer chain can be supplied if required.

'KP' Typical Standard Tank Installation
'KP' Typical Twin Tank Installation
Case Studies

Keraflo valves control stored water at Arsenal’s Emirates Stadium

(Image courtesy of Arsenal FC)

Keraflo Ltd. has supplied stored water control valves to mechanical contractor MJN Colston for Emirates Stadium, the spectacular new home of Arsenal Football Club. These delayed action float valves ensure high water flow rates, ensuring that the 130,000 litre capacity water tank installed prior to the booster set is filled as quickly as possible.

Arsenal FC’s stadium, named for its sponsors Emirates Airlines, was opened in July 2006 and was fully operational in time for the start of the 2006/2007 football season. Located close to the old Highbury stadium, the new facility is a huge elliptical structure built on a triangular site in Islington and comprises five main levels of accommodation with four seating tiers.

The new 60,000 seat stadium regularly attracts capacity crowds on match days and the requirement for water on the site is therefore enormous. The anticipated demand has been met by the installation of a 132m3 sectional GRP storage tank by mechanical contractor, MJN Colston. The tank is of drinking water quality, manufactured by Balmoral Tanks. This serves all domestic cold water outlets on the site, including the extensive catering and toilet facilities, via a booster pumpset. The 11m x 3m x 4m deep tank is divided along its length by a partition which enables each half of the tank to be isolated for maintenance purposes.

Each side of the tank is fitted with a Keraflo Aylesbury KP Type valve kit, selected by consulting engineers Buro Happold. Their senior building services engineer, Peter Naylor commented: ‘We selected these valves, in consultation with Balmoral Tanks and Keraflo Ltd., both for their ability to fill each side of the tank quickly and to accurately match water storage levels to occupancy.’

The KP Type valve kits installed comprise KB Type float valves located in a valve chamber above each half of the tank, with two larger in-line valves mounted at high level on the supply pipework. The Aylesbury KB Type valve offers a fully variable differential between opening and closing water level settings. Changes in water levels and settings can be made quickly by the installer or maintenance engineer without the use of tools, making it particularly suitable for use in buildings with seasonal occupancy. Water discharge is via an ‘up and over’ pipe to facilitate air gap compliance and provide back siphonage protection in accordance with BS1212 Part 2.

The 8” incoming water main was split into two 4” supply pipes, each fitted with an Aylesbury KP Type 4” (100mm) in-line valve. These valves are opened and closed by the Aylesbury KB Type pilot valves due to pressure fluctuations in the pilot lines. These smaller valves are operated by transfer of weight in an actuator tube which causes the valve to open or close in a single delayed action, rather than giving the gradual opening and closing achieved with a conventional ball valve. Attached to the actuator is a 2m long chain with a float and buoy assembly which offers a fully variable differential between opening and closing water level settings by simple adjustment of the length of chain between the actuator and the floats.

Keraflo delayed action float valves avoid water hammer, valve bounce and pump hunting leading to improved pump performance and maximum energy efficiency. In addition, they reduce the risk of stagnation and water borne diseases which can occur when stored water is not used for long periods of time, particularly at high ambient temperatures in the summer months.

The water services, float valves and incoming mains, as well as the remainder of the mechanical services and public health works were installed by MJN Colston Ltd. The main contractor was Sir Robert McAlpine Ltd.

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Aylesbury 'KP' Type
Fully Variable Delayed Action Float Valve suitable for tanks with or without raised valve chambers
Aylesbury 'KB' Type
Find out more
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