Want to have a back-up water supply for your cistern/rain tank in case of drought? Our industrial-strength Jobe Topaz 3/4" Differential Valve is the perfect product for bringing in a well water or municipal water supply to your rain tank when the tank runs low.
Topaz Differential valves are especially ideal for use in water tanks which are filled by a pressure system controlled water pump. The valve gives a level difference which is adjustable from 2 inches (50mm) up to 8 ft (2.5m) to minimize starting and stopping of the pumping system.
Start and stop levels can be easily adjusted to give water level differentials from 2 in. up to 8 ft.
Keeps pump operation to a minimum.
Detach Valve Seal Access System for quick access to valve seal (Patented)
Ideal for all makes and models of tanks.
3/4" (20mm) inlet size
PRINCIPLE OF OPERATION
The valve mounts at the top of the tank. It fits easily through a thin walled tank or screws into a threaded tank inlet.
As the tank empties the weighted float travels down the cord until it hits the bottom stop. The valve then opens immediately to give a full flow.
The valve now runs constantly and the weighted float rises until it hits the upper float stop. This lifts the arm and the valve shuts down.
Observe the pressure that your pump runs at while the tank is filling. Set the pressure switch to turn the pump off at a pressure at least one bar above the running pressure.