Fisher Type 289H-HH1 Backpressure Regulator/Relief Valve

The Fisher Type 289H-HH1 Backpressure Regulator is a 1" npt valve with 45-75 psi spring range. The smooth throttling action minimizes pressure surges in the system during emergency operation. The unit features a pilot tube booster to achieve the highest possible relief capacity with a minimum build-up of the system pressure. The 289H-HH1 is installed between large second-stage regulators and the burner to provide high capacity relief. They are also ideal for low pressure settings due to increased sensitivity provided by the large diaphragm area.