Topaz Differential valves are ideal for use in water tanks that are filled by a pressure system-controlled water pump. The valve gives a level difference that is adjustable from 50mm up to 2.5m to minimize starting and stopping of the pumping system.

Maximum Operating Temperature 60ºC/140ºF

Operating Pressure 1-10 Bar(15-150psi)

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.