Relief / Backpressure
Fisher backpressure regulators maintain desired upstream pressure by varying the flow in response to changes in upstream pressure. Pressure relief valves provide overpressure protection in case of unexpected pressure buildup.
 | Fisher 1805 Series relief valves are primarily designed for use in farm tap applications where a safety relief valve is needed between the first and second stage regulators. |
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 | Fisher Type 289H is installed between large second-stage regulators like the CS400 or CS800 and the burner to provide high capacity relief. The large diaphragm in these valves gives extremely sensitive operation. |
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 | Fisher Type 98H is a self-operated relief valve for use on relief and back pressure applications involving large LP-Gas pumping systems and vaporizers. Internal pressure registration eliminates the need for a control line. |
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