Apex Big Boy Diaphragm Reservoir Valve

The Apex Big Boy Diaphragm Reservoir Valve is built for larger storage tanks and reservoirs where a standard float valve may not deliver enough flow. Using the two-word Big Boy naming convention throughout the page makes sense for search intent, while still reflecting the official Apex BigBoy product range. The valve is designed to maintain minimum and maximum water levels in a tank or reservoir and can be used in pump, mains or gravity feed applications.

A key benefit of the Apex Big Boy is its soft-closing diaphragm design, which helps reduce water hammer in higher-volume systems. It operates in a full-on / full-off manner and can be used for either single-level or variable water level control, depending on the installation. It is also used in rain harvesting systems as a back-up water supply control valve when demand exceeds available rainfall.

This range is available in three sizes. The BB-32 uses a 1 1/4 inch taper pipe thread, the BB-40 uses a 1 1/2 inch taper pipe thread, and the BB-50 uses a 2-inch taper pipe thread. The dimensional drawings for all three sizes show an overall body size of approximately 106mm x 209mm.

With flow rates of up to 1500 litres per minute at 1200 kPa, the Apex Big Boy is a strong choice for high-demand reservoir and tank filling applications where fast refill, reliable shut-off and high-volume inlet control are critical.

Features:

• High-volume diaphragm reservoir valve for tanks and reservoirs.
• Designed for pump, mains or gravity feed applications.
• Maintains minimum and maximum water levels within a tank or reservoir.
• Can be used for single-level or variable water level control.
• Soft closing design to help reduce water hammer.
• Full on / full off operation.
• Flow rate up to 1500L/min at 1200 kPa.
• Available in 32mm, 40mm and 50mm sizes.

Thread sizes:

• 32mm: 1 1/4″ taper pipe thread.
• 40mm: 1 1/2″ taper pipe thread.
• 50mm: 2″ taper pipe thread.