{"product_id":"hoffman-401413-model-4a-non-vacuum-air-valve","title":"Hoffman 401413 Model 4A Non-Vacuum Air Valve","description":"\u003cp\u003eEfficiently manage air discharge in one-pipe steam heating systems with the \u003cstrong\u003eHoffman 401413 Model 4A\u003c\/strong\u003e non-vacuum air valve. Designed for high-performance venting, this valve ensures your radiators operate at peak efficiency by removing trapped air that can hinder heat transfer throughout your hydronic network.\u003c\/p\u003e\u003cp\u003eThe unit features a precision-engineered bimetallic element that remains open to allow cold air to escape, then automatically closes when steam reaches the valve to prevent leakage. This simple yet highly effective thermal expansion mechanism ensures quiet, consistent operation without the need for manual adjustment or external power sources.\u003c\/p\u003e\u003ch4\u003eKey System Performance Baselines:\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eEfficient Air Removal:\u003c\/strong\u003e Rapidly exhausts cold air to allow steam to reach radiators quickly.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePositive Seal:\u003c\/strong\u003e Integrated thermostatic design closes reliably upon contact with steam.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDurable Construction:\u003c\/strong\u003e Engineered to withstand the rigors of standard steam heating system pressures.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e⚠️ \u003cstrong\u003eApplication Profile:\u003c\/strong\u003e Primarily designed for use on one-pipe steam radiators, convectors, and unit heaters in residential or commercial heating environments.\u003c\/p\u003e","brand":"Hoffman","offers":[{"title":"Default Title","offer_id":43128716886110,"sku":"401413","price":74.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0663\/7151\/8558\/files\/401413_image_fba34b94-02fa-4792-8224-687999332ae5.png?v=1786068999","url":"https:\/\/nationalboilersupply.com\/products\/hoffman-401413-model-4a-non-vacuum-air-valve","provider":"National Boiler Supply","version":"1.0","type":"link"}