{"product_id":"armstrong-573100-008-a400-l-expansion-tank","title":"Armstrong 573100-008 A400-L Expansion Tank","description":"\u003cp\u003eEfficient hydronic system management requires reliable pressure regulation, which is exactly what the \u003cstrong\u003e573100-008 Armstrong A400-L Expansion Tank\u003c\/strong\u003e is engineered to provide. This component acts as a critical safety and operational buffer in closed-loop heating and cooling circuits, ensuring that fluctuating water volumes caused by thermal expansion are managed effectively to protect sensitive system components from damage.\u003c\/p\u003e\u003cp\u003eBy utilizing an internal diaphragm, the model \u003cstrong\u003eA400-L\u003c\/strong\u003e absorbs excess pressure as the fluid temperature rises, preventing the relief valve from unnecessary discharging. This mechanism maintains steady operating pressures, which significantly extends the service life of pumps, boilers, and piping infrastructure while preventing common issues like aeration or system water loss.\u003c\/p\u003e\u003ch4\u003eKey System Performance Baselines:\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePressure Regulation:\u003c\/strong\u003e Maintains consistent system pressure to prevent premature relief valve activation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCorrosion Resistance:\u003c\/strong\u003e Heavy-duty shell construction provides long-term durability in demanding hydronic environments.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDiaphragm Integrity:\u003c\/strong\u003e High-grade internal membrane isolates the system water from the air cushion for reliable performance.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e⚠️ \u003cstrong\u003eApplication Profile:\u003c\/strong\u003e Recommended for use in residential and light commercial closed-loop hydronic heating systems, radiant floor heating installations, and chilled water loops requiring consistent expansion management.\u003c\/p\u003e","brand":"Armstrong","offers":[{"title":"Default Title","offer_id":43133410934878,"sku":"573100-008","price":6448.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0663\/7151\/8558\/files\/573100_008_image_657f049f-3c5d-4e67-8328-4f2354953d87.png?v=1786105464","url":"https:\/\/nationalboilersupply.com\/products\/armstrong-573100-008-a400-l-expansion-tank","provider":"National Boiler Supply","version":"1.0","type":"link"}