Introduction

Figure 1. 289H Series Relief Valve

The 289H Series is a 2-inch spring-loaded relief valve for a relief pressure range of 7-inches w.c. to 10 psig (17 mbar to 0,69 bar).

This unit features a pitot tube booster to achieve the highest possible relief capacity with a minimum buildup of system pressure.

The 289H Series is installed between large Second-Stage regulators (such as the S202G or S302G Series) and the burner to provide high capacity relief. The large diaphragm in these valves gives extremely sensitive operation.

Maximum Relief (Inlet) Pressure
25 psig (1,7 bar)

Relief Adjustment Range
See Table 1

Temperature Capabilities
-20° to 150°F (-29° to 66°C)

Body Sizes and End Connection Styles
See Table 1

Additional Technical Data
For more technical information contact your Fisher Distributor or refer to LP-31 Equipment Buyer’s Guide.

Features

• Throttling Type Relief
• High Flow Rates
• Small Size
• Reliability Due to Simplicity

Figure 2. Dimensions

Figure 3. 289H Series Sectional View