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- The Hoffman Specialty 401434 is a model 75 main steam vent air valve (non-vacuum) for low pressure. This float-type thermostatic vent has a 1/2" NPT female and a 3/4" NPT male straight shank. The maximum steam pressure is 15 psi, and the maximum operating pressure (the maximum pressure against which the vent can open) is 3 psi. A main steam vent is used in steam heating systems to release air and non-condensable gases, maintain proper system pressure, prevent water hammer, and enhance energy efficiency.
- Float-type thermostatic vent
- For medium and large systems
- MaterialSteelNominal Size3/4 in x1/2 inTemperature Rating240 deg FManufacturer #401434