{"product_id":"hoffman-401485-model-78-water-main-vent-valve","title":"Hoffman 401485 Model 78 Water Main Vent Valve","description":"\u003cp\u003eEfficient air removal is essential for maintaining a balanced and responsive hydronic heating system, and the \u003cstrong\u003e401485\u003c\/strong\u003e Hoffman \u003cstrong\u003eModel 78\u003c\/strong\u003e water main vent valve is engineered to provide precise, automatic venting. By effectively purging trapped air from hydronic piping and equipment, this component prevents noise, corrosion, and circulation blockages, ensuring your system operates at peak thermal efficiency throughout the heating season.\u003c\/p\u003e\u003cp\u003eThe unit features a reliable float-operated mechanism that remains open to exhaust air as the system fills or operates, and seals tightly against a precision-ground seat once the system is fully pressurized with water. Its durable construction ensures longevity under standard operating pressures, making it an industry-standard choice for main piping applications requiring consistent air management.\u003c\/p\u003e\u003ch4\u003eKey System Performance Baselines:\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eAutomatic Air Purging:\u003c\/strong\u003e Designed to continuously vent air pockets to maintain system pressure and efficiency.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRugged Construction:\u003c\/strong\u003e Built with high-quality materials to resist internal pressure stresses and long-term wear.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrecision Sealing:\u003c\/strong\u003e Features a close-tolerance valve seat to prevent leakage during operation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSimplified Maintenance:\u003c\/strong\u003e Engineered for easy installation and reliable performance in critical system locations.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e⚠️ \u003cstrong\u003eApplication Profile:\u003c\/strong\u003e Primarily utilized for residential and commercial hydronic heating systems, specifically intended for installation on main distribution lines where air accumulation typically occurs during filling or expansion cycles.\u003c\/p\u003e","brand":"Hoffman","offers":[{"title":"Default Title","offer_id":43128774852702,"sku":"401485","price":319.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0663\/7151\/8558\/files\/401485_image_ab57a28d-538a-41ed-af95-ec75b73b6685.png?v=1786069833","url":"https:\/\/nationalboilersupply.com\/products\/hoffman-401485-model-78-water-main-vent-valve","provider":"National Boiler Supply","version":"1.0","type":"link"}