Model BV70
The Model BV70 Brodie Differential Control Valves are normally closed valves designed to maintain a controlled pressure differential within +/-2%. The pilot is balanced, single seated with large ports and will operate on a differential as low as 5 PSI (34.5 kPa).

Principle of Operation
The Valve is pilot operated and operates on a balanced piston principle, spring biased to a closed position. Pressure differential overcomes the force of the spring, causing the main valve to open and establish flow. The pilot control varies the pressure on the spring side of the piston for position.