The FOX TFC Series Gas Discharge Fuse Plug is a fundamental safety device for hydraulic systems. These components are mounted directly on the nitrogen valve with the specific purpose of discharging the gas inside the accumulator in the event of fire. The activation mechanism is based on an internal support pellet. When the external temperature reaches critical levels, specifically a melting temperature of 135°C with a tolerance of +/- 5°C, this pellet melts. This melting process causes an internal mechanical pin to be released, opening the nitrogen valve and allowing the subsequent immediate discharge of gas. This system ensures passive and automatic discharge of the component, preventing dangerous overpressure caused by accumulator overheating in thermal emergency conditions.

Construction Features and Materials

The design of the FOX TFC Series Gas Discharge Fuse Plug is optimized to ensure rapid thermal response and constant reliability over time. A relevant construction feature is that no seals are used inside the device. The standard body is made of brass, a material specifically chosen to promote and increase thermal conductivity, ensuring that heat from the surrounding environment quickly reaches the melting pellet. In addition to the standard brass configuration, the device is available upon request in further material variants to suit specific operating and environmental contexts: the carbon steel version and the AISI 316 L stainless steel version can be requested. The component also integrates specific gas bleed ports and internal springs that assist pin ejection.

Technical Data and Calibration Specifications

From a technical standpoint, the outlet diameter for gas passage is configured as 4xØ2 mm, ensuring rapid and efficient discharge. The standard plug connection is 5/8″ UNF, compatible with FOX standard gas valves. A key parameter for the correct use of the FOX TFC Series Gas Discharge Fuse Plug is the operating pressure: this device must be strictly selected according to the maximum precharge pressure inside the accumulator. Three maximum nitrogen pressure calibrations (N2 MAX) are available: 130 barg, 250 barg and 400 barg. The gas discharge coefficient (K) is 0.95. The component supports extreme working temperatures, with an operating range from a minimum of -40°C to a maximum of +100°C. Each component is supplied with an S.E.P. test certificate.

Installation and Applications

To ensure correct activation in an emergency, installation requires precise precautions: gas discharge fuse plugs must be mounted close to the gas valve and must be in direct communication with the nitrogen contained in the accumulator. The product usage limits are based solely on compatibility with the indicated FOX valves and the specified pressure calibrations, with no additional application requirements other than protecting accumulators against fire risk.

Technical Summary Table