Product Overview

The Fisher Type 289H is a throttling relief valve that vents overpressure downstream of gas regulators. The Type 289H is the higher-pressure member of the Fisher 289 series, using an O-ring seat instead of a diaphragm disk.

Key Features

• 1 and 2 NPT sizes with four available spring ranges

• Relief settings from 7 in. w.c. (17 mbar) up to 50 psig (3.4 bar)

• O-ring seat with NBR or FKM seating for tight shutoff

• Pitot tube booster maximizes relief capacity at high flow

• Single internal assembly for reliability and simple maintenance

Typical Applications

Overpressure venting on natural gas, LPG and air systems downstream of regulators, where higher set points and larger vent connections are required.

Selection Guide

Confirm the required set point and connection size (1 or 2 NPT) so the correct spring range is supplied. Contact us with your system data for an exact recommendation.