Aylesbury ‘KB’ Type

- Fully Variable Delayed Action Float Valve
- Suitable for tanks with or without raised valve chambers

Equilibrium float valve with DZR brass body, having fully variable delayed action.

The up and over discharge conforms in principle to BS.1212 part 2. The valve incorporates a non-wearing maintenance-free ceramic disc seal for water pressures up to 10 Bar.

For standard cisterns with or without a raised chamber.

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. The unique design makes this valve ideal for use with pumped systems, water treatment plants and many other applications including:

• Industrial tanks
• Rain (grey) water tanks and reservoirs
• Pumped systems
• Industrial feed and expansion tanks
• Underground tanks
• Process tanks

For more information on these applications, call our technical support team.

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 an immense 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 0% efficiency. The fill volume can be set to equal or exceed this volume thereby ensuring 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 applications.

Rain (Grey) water tanks and reservoirs - For economy and environmental reasons, rain water is increasingly being used for applications where drinking water standards are not required. At times of inadequate rainfall, there is no choice but to use mains water. A valve is therefore required to admit mains water when the level in the rain water tank is low. The ‘KB’ valve is ideal due to a 2 m long chain allowing for a low opening level and the correct air gap requirement.

Process tanks - Tanks storing water in industrial processes are fluid category 5 requiring a Type AA or AB air gap. They may be small and irregular and the flow through the float valve may also need to be constant. ‘KB’ valves are ideal in these instances.

Industrial feed and expansion tanks - The water level in a large LTHW F&E tank can rise and fall several feet. Since non-domestic F&E tanks are a fluid category 5 risk, they require a Type AA air gap. The ‘KB’ valve is perfect because it can be mounted high in the tank (maximising the air gap) and the opening level can be set low, allowing sufficient volume for expansion. Maximum temperature 60°C.

Underground tanks -Water storage tanks can be buried underground. Facilitating access to a float valve in this situation is difficult, so it is desirable to mount the valve above ground. Provided the water is ducted from the valve, a ‘KB’ valve can be mounted above ground with only the closing float and opening buoy in the tank.

Specification Details

Equilibrium float valve with DZR brass body, having fully variable delayed action. The up and over discharge conforms in principle to BS.1212 part 2. The valve features a non-wearing maintenance-free ceramic disc seal for water pressures up to 10 Bar. For standard water cisterns without raised chamber. WRAS listing no. 0610084