{"product_id":"mcdonnell-miller-114641-fs4-3s-1-flow-switch-with-stainless-steel-body","title":"McDonnell \u0026 Miller 114641 FS4-3S 1\" Flow Switch with Stainless Steel Body","description":"\u003cp\u003eMaintain consistent flow detection in your hydronic or industrial piping systems with the \u003cstrong\u003eMcDonnell \u0026amp; Miller 114641 FS4-3S\u003c\/strong\u003e, a high-performance flow switch engineered for reliability. This unit, identified by part number \u003cstrong\u003e114641\u003c\/strong\u003e, is specifically designed to monitor liquid flow and trigger automated responses to protect sensitive equipment from no-flow conditions.\u003c\/p\u003e\u003cp\u003eThe device operates by utilizing a precision-engineered paddle mechanism that responds to fluid movement within the pipe. When flow drops below the set point, the internal switch triggers, making it an essential component for pump protection, chiller management, and liquid monitoring systems where operational uptime is critical.\u003c\/p\u003e\u003ch4\u003eKey System Performance Baselines:\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial Integrity:\u003c\/strong\u003e Features a robust stainless steel body for superior chemical resistance.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBellows Durability:\u003c\/strong\u003e Equipped with a Monel bellows assembly to withstand demanding fluid environments.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSystem Integration:\u003c\/strong\u003e Designed for seamless installation into standard 1-inch piping configurations.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e⚠️ \u003cstrong\u003eApplication Profile:\u003c\/strong\u003e Ideal for commercial HVAC chillers, boiler feed systems, liquid processing lines, and booster pump protection where durable flow monitoring is required.\u003c\/p\u003e","brand":"McDonnell \u0026 Miller","offers":[{"title":"Default Title","offer_id":43123966378078,"sku":"114641","price":646.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0663\/7151\/8558\/files\/114641_image_68038aae-e365-4e94-ab09-77d5d9e6ccbc.png?v=1786027230","url":"https:\/\/nationalboilersupply.com\/products\/mcdonnell-miller-114641-fs4-3s-1-flow-switch-with-stainless-steel-body","provider":"National Boiler Supply","version":"1.0","type":"link"}