{"product_id":"hoffman-401425-model-1b-non-vacuum-air-valve","title":"Hoffman 401425 Model 1B Non-Vacuum Air Valve","description":"\u003cp\u003eMaintaining proper steam pressure and airflow is essential for the longevity of your heating system, and the \u003cstrong\u003eHoffman 401425 Model 1B\u003c\/strong\u003e air valve is engineered to provide reliable venting for single-pipe steam systems. This high-quality non-vacuum valve is designed to efficiently expel air from radiators during the heating cycle, ensuring that steam can circulate freely and evenly throughout your space.\u003c\/p\u003e\u003cp\u003eThis valve operates through a precision-engineered internal float mechanism that allows air to escape while automatically closing when steam reaches the vent. By preventing the leakage of steam and water, the \u003cstrong\u003e401425\u003c\/strong\u003e ensures your system remains pressurized and energy-efficient, effectively reducing the noise and uneven heating associated with air-bound radiator units.\u003c\/p\u003e\u003ch4\u003eKey System Performance Baselines:\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eAutomatic Venting:\u003c\/strong\u003e Rapidly purges air from steam radiators for efficient system distribution.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePositive Seal:\u003c\/strong\u003e Integrated thermostatic element closes tightly to prevent steam loss.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDurable Build:\u003c\/strong\u003e Constructed to withstand the high-temperature demands of residential and light commercial steam heating environments.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e⚠️ \u003cstrong\u003eApplication Profile:\u003c\/strong\u003e Recommended for use in single-pipe steam heating systems, including residential cast iron radiators, steam mains, and dry return lines where atmospheric venting is required.\u003c\/p\u003e","brand":"Hoffman","offers":[{"title":"Default Title","offer_id":43128724062302,"sku":"401425","price":94.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0663\/7151\/8558\/files\/401425_image_980221eb-7eac-4d0d-ae98-32bd8a226ebd.png?v=1786069099","url":"https:\/\/nationalboilersupply.com\/products\/hoffman-401425-model-1b-non-vacuum-air-valve","provider":"National Boiler Supply","version":"1.0","type":"link"}