{"product_id":"watson-mcdaniel-r-series-back-pressure-relief-valves-for-water-liquids-heavy-duty-bronze-valve-body-5-35-psig-stainless-steel-disc-1-2-3-npt","title":"Watson McDaniel R-Series Back Pressure \u0026 Relief Valves (For Water\/Liquids), Heavy-Duty Bronze Valve Body, 5 - 35 PSIG, Stainless Steel Disc, 1\/2\" - 3\" NPT","description":"\u003ch2\u003eWatson McDaniel R-Series Back Pressure \u0026amp; Relief Valves, 5 - 35 PSIG For Water\/Liquids (1\/2\" - 3\" NPT)\u003c\/h2\u003e\u003ch2\u003eFeatures:\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eFour Springs – Easily interchanged to cover pressures from 1 to 300 PSIG.\u003c\/li\u003e\n\u003cli\u003eHeavy-Duty Bronze Valve Body\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eOptions \u0026amp; Features (See Specification Sheet For Full List):\u003c\/strong\u003e\u003c\/p\u003e\u003ch2\u003eR-Series Back Pressure \u0026amp; Relief Valves (For Water\/Liquids)\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003eWater, Liquids:\u003c\/strong\u003e Relief \u0026amp; Back Pressure Valves, The R-Series \u0026amp; 10691 Series are economically-priced Back Pressure Relief Valves for Liquid service. Relief Valves\/Back Pressure Valves are used to maintain a specific back pressure or to protect systems from an over-pressure condition.\u003c\/p\u003e\u003cp\u003eThe \u003cstrong\u003eR-Series\u003c\/strong\u003e Back Pressure \u0026amp; Relief Valves relieve upstream pressure in a variety of processes. R-Series has a stainless steel disc. This valve automatically maintain desired maximum pressure in a vessel or system by relieving excess pressure into lower pressure re turn line or to atmosphere. Ideally suited for use as pump bypass control valve by maintaining constant pump discharge pressures. Used as a continuously operating valve or for protection against intermittent over pressure conditions.\u003c\/p\u003e\u003cp\u003eThe R-Series Back Pressure Relief Valves are used in the following applications:\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eWater pump bypass for irrigation, sprinkler systems on golf courses, fountains and fire protection systems.\u003c\/li\u003e\n\u003cli\u003eFuel oil pump bypass on commercial systems or large residential systems.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cem\u003e\u003cstrong\u003eImportant Note:\u003c\/strong\u003e\u003c\/em\u003e \u003cstrong\u003eNOT TO BE USED ON STEAM.\u003c\/strong\u003e\u003c\/p\u003e\u003ch2\u003eHow It Works\u003c\/h2\u003e\u003cp\u003eThe Relief Valve is actuated by the system pressure on the inlet side of the valve. Valve loading is provided by a spring. The adjustment is done by removing the cap and rotating the screw clockwise or counter-clockwise. Spring load balances against the opening force of the upstream (or relief) pressure. Valve will open at the slightest increase in pressure above the spring set point, and will close when the excess pressure has been relieved.\u003c\/p\u003e\u003cp\u003eThe higher the system pressure is above the relief set point pressure, the more flow the valve will pass. It is therefore typical to specify the maximum capacity of a back pressure relief valve at 10% and 20% over set pressure.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003ePressure Adjustments\u003c\/strong\u003e\u003cbr\u003eTo adjust set pressure of valve, remove top cap, loosen lock nut and adjust pressure by rotating adjustment screw. Rotating the screw clockwise increases the compression on the spring thereby increasing the set pressure. Rotating the screw counterclockwise lowers the set pressure. Tighten the lock nut and replace top cap and gasket.\u003c\/p\u003e\u003ch2\u003eSelection \/ Sizing \/ Capacities\u003c\/h2\u003e\u003cdiv style=\"clear: both;\"\u003e\n\u003cp\u003eThe Relief Valve remains closed until the Set-Pressure is reached. When the Set-Pressure is met or exceeded, the spring will compress, allowing the valve to open and flow to occur. It is standard practice to publish flow values at 10% and 20% over the Set-Pressure.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eExample:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\u003cli\u003eA 1” valve set at 50 PSIG will pass 3.1 GPM if the system pressure exceeds the set point by 20%.\u003c\/li\u003e\u003c\/ul\u003e\n\u003cp\u003eThe R-Series Relief Valve water capacities at inlet pressures of 10% and 20% over Set-Pressure.\u003c\/p\u003e\n\u003c\/div\u003e\u003cdiv style=\"clear: both;\"\u003e \u003c\/div\u003e\u003cdiv class=\"tech\"\u003e\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003cdiv class=\"specs\"\u003e\n\u003cdiv class=\"column\"\u003e\n\u003cdiv class=\"row\"\u003e\n\u003cdiv class=\"left\"\u003eModel\u003c\/div\u003e\n\u003cdiv class=\"right\"\u003e\u003cdiv\u003eR-Series\u003c\/div\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"row\"\u003e\n\u003cdiv class=\"left\"\u003eService\u003c\/div\u003e\n\u003cdiv class=\"right\"\u003e\u003cdiv\u003eLiquids\u003c\/div\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"row\"\u003e\n\u003cdiv class=\"left\"\u003eSizes\u003c\/div\u003e\n\u003cdiv class=\"right\"\u003e\u003cdiv\u003e1\/2\" - 3\"\u003c\/div\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"row\"\u003e\n\u003cdiv class=\"left\"\u003eConnections\u003c\/div\u003e\n\u003cdiv class=\"right\"\u003e\u003cdiv\u003eNPT\u003c\/div\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"row\"\u003e\n\u003cdiv class=\"left\"\u003eBody\u003c\/div\u003e\n\u003cdiv class=\"right\"\u003e\u003cdiv\u003eBronze\u003c\/div\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"row\"\u003e\n\u003cdiv class=\"left\"\u003eSeat Material\u003c\/div\u003e\n\u003cdiv class=\"right\"\u003e\u003cdiv\u003eBronze\u003c\/div\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"column\"\u003e\n\u003cdiv class=\"row\"\u003e\n\u003cdiv class=\"left\"\u003eDisc Material\u003c\/div\u003e\n\u003cdiv class=\"right\"\u003e\n\u003cdiv\u003eStainless Steel (1\/2\" - 1-1\/2\")\u003c\/div\u003e\n\u003cdiv\u003eBronze (2\" - 3\")\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"row\"\u003e\n\u003cdiv class=\"left\"\u003eMax Inlet Pressure\u003c\/div\u003e\n\u003cdiv class=\"right\"\u003e\u003cdiv\u003e300 PSIG\u003c\/div\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"row\"\u003e\n\u003cdiv class=\"left\"\u003eDesign Pressure\/Temperature Rating - PMA\/TMA\u003c\/div\u003e\n\u003cdiv class=\"right\"\u003e\u003cdiv\u003eNPT - 300 PSIG @ 180°F\u003c\/div\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"row\"\u003e\n\u003cdiv class=\"left\"\u003ePart Number\u003c\/div\u003e\n\u003cdiv class=\"right\"\u003e\u003cdiv\u003eN\/A\u003c\/div\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\u003cdiv style=\"clear: both;\"\u003e \u003c\/div\u003e\u003ch2\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0721\/4576\/4430\/files\/Watson-McDaniel-R-Series-10691-Series-Back-Pressure-Relief-Valves-Spec-Sheet.pdf?v=1786495689\"\u003eView Technical Specification Sheet Here\u003c\/a\u003e\u003c\/h2\u003e","brand":"Watson McDaniel","offers":[{"title":"Default Title","offer_id":44166174769230,"sku":"WM-R-N-3","price":260.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0721\/4576\/4430\/files\/Watson-McDaniel-R-Series-10691-Series-Back-Pressure-Relief-Valves__74844.1784300266.1280.1280.jpg?v=1786668356","url":"https:\/\/valveman.com\/products\/watson-mcdaniel-r-series-back-pressure-relief-valves-for-water-liquids-heavy-duty-bronze-valve-body-5-35-psig-stainless-steel-disc-1-2-3-npt","provider":"ValveMan","version":"1.0","type":"link"}