{"product_id":"honeywell-v4943b1019u-diaphragm-gas-valve-1-inch-npt","title":"Honeywell V4943B1019U Diaphragm Gas Valve 1 Inch Npt","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe HONEYWELL V4943B1019U is a single-stage, pressure-regulating diaphragm gas valve with a slow-opening design. It controls gas flow in heating equipment by using a diaphragm mechanism to regulate outlet pressure and provide a controlled, gradual valve opening on each call for heat. The 1-inch NPT pipe connection and 0.5 psi maximum pressure rating make it suited for a range of commercial and residential gas-fired heating applications. Licensed gas technicians and HVAC service professionals typically handle installation and commissioning of this valve.\u003c\/p\u003e\u003cp\u003eThis valve is used on boilers, unit heaters, duct furnaces, makeup air units, and rooftop heaters. Its single-stage pressure regulation simplifies system design where two-stage firing is not required. The slow-opening characteristic reduces pressure surges at ignition, which is important in larger heating appliances where abrupt gas delivery can cause ignition problems or burner instability. It fits applications where a 1-inch NPT gas train connection is specified.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eSingle-stage pressure regulation for consistent outlet gas pressure\u003c\/li\u003e\n\u003cli\u003eSlow-opening operation reduces ignition pressure surges\u003c\/li\u003e\n\u003cli\u003e1-inch NPT pipe connection for direct in-line gas train installation\u003c\/li\u003e\n\u003cli\u003e0.5 psi maximum inlet pressure rating\u003c\/li\u003e\n\u003cli\u003eDiaphragm design provides reliable, repeatable pressure control\u003c\/li\u003e\n\u003cli\u003eSuitable for boilers, unit heaters, duct furnaces, makeup air, and rooftop heaters\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eThe V4943B1019U is part of the V4943\/8943B, C, and N valve series and is designed for use on boilers, unit heaters, duct furnaces, makeup air units, and rooftop heaters requiring a single-stage pressure-regulating gas valve with a 1-inch NPT connection.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eInstallation must be performed by a licensed gas technician or qualified HVAC professional in accordance with local codes and the appliance manufacturer's instructions. Shut off the main gas supply and verify zero pressure at the valve before beginning any work. The valve body must be installed with the correct gas flow direction as indicated by the arrow on the valve body, and all NPT connections must be leak-tested with an approved gas leak detection solution after installation. Consult applicable codes such as the IFGC and local jurisdictional requirements before placing the appliance back in service.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePipe Size\u003c\/strong\u003e: 1 inch NPT\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaximum Inlet Pressure\u003c\/strong\u003e: 0.5 psi\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eValve Action\u003c\/strong\u003e: Slow Opening\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRegulation Type\u003c\/strong\u003e: Single Stage Pressure Regulating\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eValve Type\u003c\/strong\u003e: Diaphragm Gas Valve\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eStandard Information\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand\u003c\/strong\u003e: HONEYWELL\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: V4943B1019U\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"HONEYWELL","offers":[{"title":"Default Title","offer_id":51468192940338,"sku":"V4943B1019U","price":234.81,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/313945055.jpg?v=1783914001","url":"https:\/\/voomisupply.com\/products\/honeywell-v4943b1019u-diaphragm-gas-valve-1-inch-npt","provider":"Voomi Supply","version":"1.0","type":"link"}