1 1/2' Keraflo KB Type HF, Variable Delayed Action Float Valve, 40mm


Product Ref: A/KB40HF

Non Returnable Product

Estimated Lead time:1- 3 working days

Home Delivery

UK mainland delivery from £21.50 ex VAT

check delivery cost


Downloadable Documents

Product Description

1 1/2' Keraflo KB Type HF, Variable Delayed Action Float Valve, 40mm Description

Aylesbury Keraflo KB Type High Flow 1 1/2' (40mm) - 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 - 60 C.

  • 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.


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.

Product Details

  • Product Code: PW
  • Outlet Size: 1 1/2" BSP Male
  • Stock tank: Non Returnable Product


Our shipping costs cover most of the UK - however, parts of England, Scottish Highlands and Islands including areas north of the Glasgow / Edinburgh border, Isle of Wight, Channel Islands, Isle of Man, Anglesey, Western Isles, Shetland Islands, Orkney Islands, Isles of Scilly, Northern Ireland and the Republic of Ireland may cost more.

Please call before ordering if the delivery postcode is listed below. There may be additional shipping costs. AB, BT, CA, CT, DD, DG, EH, FK, G, GY, IM, IV, JE, KA, KW, KY, LD, LL, ML, PA, PH, PO 30-41 (Isle of Wight), SA, SY, TD, TN, TR, ZE Southern Ireland

Our lead times should only be used as a guide and are subject to change.


Unless a hi-ab delivery has been booked at additional cost, it is the customer's responsibility to offload with suitable equipment on the day of delivery and a failed delivery may result in additional charges.

We recommend installers and/or plant hire & materials to install such as excavators, aggregates etc are not booked until you are in receipt of the goods. Tanks Direct cannot be held responsible for costs incurred due to unforeseen delays, please see our terms for more details.


HIAB delivery will be required if you need the tank offloaded from the delivery vehicle. The driver will unload the tank from the vehicle to ground level, however this service is not to place the tank in situ, this will need to be arranged separately.

If you have any questions regarding your delivery, please contact the Sales Team on 01643 703358.

Returns Information

Please note - Certain items may not be returnable, for example those made to order or for sanitary reasons. Please check the product page for more information.

Customers may return items within 14 calendar days (as per our Terms & Conditions) - refer to section 7. **

All Items must be returned unused, refunds cannot be issued for used or previously installed items.

Please be aware that returning a tank can be complicated and expensive, so please check that you are ordering the correct item (we suggest checking the dimensions very carefully).

If you wish to return goods, please complete the form on this page to provide further information.

Once your request is approved, a valid Returns Authorisation Number (RAN) will be issued to initiate the returns process along with information on how & where to return your order along with any costs involved.

Please DO NOT return any goods without this authorisation. Goods cannot be accepted without this.

Returns are not accepted at our Minehead Office, please wait until we contact you before returning any goods.

View Tanks Direct's return policy now.

People who bought this also bought...