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Aylesbury KP Type Float Valve Kit

control valve with pilot valve, suitable for tanks with or without raised valve chambers

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Product Information

The KP Type float valve kit is suitable for cold water storage tanks with or without raised chambers and is comprised of an in-line Control Valve together with an Aylesbury™ KB Type valve sized 3/4″ (20mm) 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 and fire sprinkler systems. This solution delivers an array of practical benefits, as follows:

High Kv Value – The KP Type inline Control Valve is available in Standard and Twin Tank models sized 1 1/2″ (40mm), 2″ (50mm), 2 1/2″ (65mm), 3″ (80mm), 4″ (100m) and 6″ (150mm) offers excellent flow rate performance.

Raised Valve Chamber – Can be small because it only has to accommodate a ¾” (20mm) Aylesbury KB Type float valve and discharge assembly.

Facilitates Air Gaps – The Aylesbury KB Type float valve is supplied with an 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 float valves are quieter than conventional valves due to the elimination of water hammer, valve bounce, “hiss” and dribble.

Positive Fill – The delayed action of Aylesbury float valves delivers a positive fill to actively churn the water in the tank.

Accessibility – 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.

Shallow Tanks – KP Type valves can operate in tanks as shallow as 1 metre in depth.

Deep Tanks – The standard Aylesbury KB pilot valve enables an opening level 2 metres below the inlet level.

Upstream Pressure Sustaining Regulator – This is available as an optional extra and when fitted the Control Valve regulates itself to leave the desired minimum upstream pressure (adjustable 1-6 Bar).

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 Type float valve kit can also be configured to service balanced partitioned tanks.

Flexibility and Ease of Installation – Conventional float valves above 3” are heavy and cumbersome, often necessitating a two person installation. When the KP Type in-line 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 pipework (preferred option)
  • Outside the tank at floor level
  • Outside the tank above the tank water level
  • Inside the tank above the tank water level

Precision-engineered and built to last, all Keraflo Aylesbury™ patented delayed action float valves are manufactured under Quality Management Systems certified to ISO.9001:2015 and designed to operate for long periods of time without maintenance.

The valves are easy to install with an ‘up and over’ discharge arrangement which assists in facilitating Type AA, AB, AF, or AG air gap requirements under the Water Regulations.

Aylesbury KP Type float valve kit with fully variable delayed action, suitable for tanks with or without raised valve chambers
Opening and closing operating differential
Up to 1,820mm (and longer on request)
Water pressure range
Suitable for 0-10 bar
Float specification
Puncture-proof float made from polyethylene closed cell foam which is CFC-free, air retardant and both chemically and biologically inert
Back-siphonage protection
Up and over discharge to BS1212 Part 2, which helps to facilitate air gap compliance
Product Features
Virtually indestructible, the heart of the valve incorporates pressure compensating rotating ceramic discs which are aligned in the open position
Reduced stress on the tank wall fixing point, due to the Aylesbury valve's radical design (no backing plate required)
Extended durability, with a non-wearing ceramic disc seal in a DZR housing
Maintenance free, designed to operate for long periods without maintenance
Improved water turnover, ideal for pumped or fire sprinkler systems, plus energy savings with positive pump control, maximised tank capacity, full flow during fill and reduced risk of Legionella
No valve bounce, dribble or incidence of water hammer
Suitable for all types of air gap applications, ensures compliance with the Water Regulations

The KP Type float valve kit features an in-line Control Valve together with an Aylesbury KB Type valve sized 3/4″ (20mm) 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.

When water is taken from the tank and the water level falls (when a tap is opened for example), the Aylesbury KB Type float valve does not immediately open (at a dribble) as would happen with a BS1212 equilibrium valve. There is, instead, a delay; the valve does not open until the water level has fallen to the user-selected level.

When this opening water level is reached the KB Type valve moves from a ‘fully closed’ position into a ‘fully open’ position, allowing water to flow into the tank at a maximum flow rate. When the water level has returned to its original full level, the valve immediately closes from the ‘fully open’ position, preventing any of the ’dribbling’ associated with equilibrium valves.

Here is a selection of documents, designed to ease specification and installation:

Product Range Guide


Download PDF
Sales Leaflet

Aylesbury Delayed Action Float-Activated Valves

Download PDF
Installation Information

Aylesbury KP Float Valve Kit

Download PDF
Installation Information

Aylesbury KP Twin Float Valve Kit

Download PDF
Quick Reference Guide

Keraflo Spares Kit

Download PDF
Specification Wordings

Cistermiser and Keraflo Product Ranges

Download PDF
Specification Catalogue


Download PDF

Here is video content illustrating the technical application of this product:

Benefits of using Aylesbury Valves

Keraflo Aylesbury Valves

BIM objects are available for download from the NBS National BIM Library, in both Revit and IFC formats.

Click here to view Keraflo products on the National BIM Library

Warranty Cover

Parts only warranty (no labour) for equipment purchased in the United Kingdom, Ireland, Isle of Man and the Channel Islands. Components of the unit which are proven to be faulty or defective in manufacture will be exchanged or repaired.

Warranty Period

1 Year from Date of Manufacture

Extended Warranty Period (available on Registration)

5 Years from Date of Installation

Extended Warranty Terms

To register and qualify for Extended Warranty cover, a photograph of the Keraflo Installation Label (included with the product and affixed to the Cold Water Storage Tank) with all installation and commissioning checklist activities completed should be sent via email to info@keraflo.co.uk.

The Keraflo Installation Label affixed to the Cold Water Storage Tank should be signed and dated with the installer’s name and the following details also provided to enable warranty registration: Keraflo product serial number, installation date and tank installation address/location.

Extended Warranty can also be registered online (via the Warranty section of this website).

What Our Customers Say...

We have been dealing with Keraflo since 2006 and have found both their products and customer service second to none.

Stuart Clark, Quality Manager, Nicholson Plastics Ltd

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Having dealt with Keraflo for over 16 years, we (Fraser & Ellis) are proud to be associated with and to offer a guaranteed quality product.

Paul Fraser, Managing Director, Fraser & Ellis Ltd

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The Keraflo valve has been and is a ground-breaking high quality product which never fails to deliver.

Norman Ross, Sales Director, Balmoral Tanks Ltd

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Catalogue Download
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Product Warranty
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