FISHER 289H series pressure regulator relief Valves or Backpressure Regulators

The FISHER 289H series is a spring-loaded, throttling relief valve that can be used as a downstream pressure regulator to protect systems from overpressure hazards. Specific descriptions are given below:

Features

Throttling Pressure Relief: Through smooth throttling action, pressure shocks in the system are minimized during pressure relief operation.

High flow rate: Can meet the demand for larger flow rates of gas discharge.

Small size: With a compact design, it occupies little space and is easy to install in a variety of different locations.

Simple and reliable: relatively simple structure, high reliability, reducing the probability of failure due to complex structure.

Technical Parameters

Valve body size and port connection: Model 289H has two specifications: 1NPT and 2NPT.

Maximum Allowable Relief (Inlet) Pressure: Typically 100 psig (6.9 bar). Maximum allowable relief (inlet) pressure is 25 psig (1.7 bar) for Model 289H.

Pressure Adjustment Range: The 289H has an adjustment range of 0.5 to 2.25 psig (34 to 155 mbar).

Temperature range: Nitrile (NBR) and chloroprene (CR) elastomers are available from - 20 to 150°F (-29 to 66°C); fluorocarbon (FKM) is available only in 289H and 289HH models, with a temperature range of 20 to 300°F (-7 to 149°C).

Some of the models in this series are listed below:

289H-41: 1” NPT port, discharge pressure 1 - 4.5 PSI.

289H-42: 1” NPT port, discharge pressure 4 - 15PSI.

289H-43: 1″ NPT port, discharge pressure 10-20PSI.

289H-49: 1” NPT port, discharge pressure 15-50PSI.

289HH-1: 1 inch NPT port, discharge pressure 45 - 75PSI.

289A: 1/4 NPT port size.

289U: 1/4 NPT port size.

289L-21: 1” NPT port size, discharge pressure 12 - 40WC.

289RC: Not specified, but part of the 289 series.