{"product_id":"fisher-289h-high-pressure-relief-valve-1-x-1-fnpt-range-4-15-psi","title":"Fisher 289H High Pressure Relief Valve 1\" x 1\" FNPT, RANGE 4-15 PSI","description":"\u003cdiv style=\"display: none;\"\u003e\n\u003ch2\u003e\u003cspan style=\"color: #0a4df5;\"\u003eNow 5% off!, Use discount code at checkout: \u003cem\u003eReliefValveSale\u003c\/em\u003e\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003c\/div\u003e\n\u003ch2\u003e\n\u003cem\u003e\u003cstrong\u003eBULK ORDERS MAY REUQIRE ADDITIONAL TIME FOR SHIPMENT.\u003cspan\u003e \u003c\/span\u003e\u003ca href=\"https:\/\/carremmcontrols.com\/pages\/contact\" target=\"_blank\"\u003eCONTACT US\u003cspan\u003e \u003c\/span\u003e\u003c\/a\u003eVIA PHONE OR\u003cspan\u003e \u003c\/span\u003e\u003ca href=\"mailto:carremm@carremmcontrols.com?Subject=Web%20Enquiry%20Fisher%20Availability\"\u003eEMAIL\u003c\/a\u003e\u003cspan\u003e \u003c\/span\u003eTO REQUEST MORE INFORMATION ON AVAILABILITY AND OTHER PRODUCT OPTIONS. \u003c\/strong\u003e\u003c\/em\u003e\u003cbr\u003e\n\u003c\/h2\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003eThe 289 Series relief valve is a throttling relief valve used downstream of pressure regulators to protect the downstream system from overpressure. A smooth throttling action minimizes pressure surges in the system during emergency operation. These relief valves are available in 1\/4, 3\/4, 1 or 2 NPT sizes with spring ranges (relief pressure settings) from 5 in. w.c. to 75 psig \/ 12 mbar to 5.2 bar.\u003c\/p\u003e\n\u003cp\u003eAll sizes above 1\/4 NPT feature a pitot tube booster for achieving the highest possible relief capacity with a minimum buildup of system pressure. When the valve is opening, high gas velocity through the orifice creates an area of relatively low pressure near the end of the pitot tube. This pitot tube effect forms a partial vacuum above the diaphragm which helps to open the valve.\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cul\u003e\u003c\/ul\u003e\n\u003ciframe src=\"https:\/\/youtube.com\/embed\/tmhY1wH7TGk\" height=\"315\" width=\"560\" allowfullscreen=\"\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture\" frameborder=\"0\"\u003e\u003c\/iframe\u003e\n\u003ch3\u003e\u003c\/h3\u003e\n\u003ch3\u003eResources:\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/1467\/2928\/files\/289-series-spring-loaded-relief-valves-bulletin-en-6129608.pdf?v=1608583882\" target=\"_blank\"\u003e289 Series Spring-Loaded Relief Valves Bulletin\u003cbr\u003e\u003c\/a\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/1467\/2928\/files\/manuals-289-series-relief-valves-instruction-manual-fisher-en-en-6106264.pdf?v=1610032264\" target=\"_blank\"\u003e\u003c\/a\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/1467\/2928\/files\/manuals-289-series-relief-valves-instruction-manual-fisher-en-en-6106264.pdf?v=1610032264\" target=\"_blank\"\u003e289 Series Spring-Loaded Relief Valves Instruction Manual\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"Fisher","offers":[{"title":"Default Title","offer_id":49162008428761,"sku":null,"price":478.22,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1467\/2928\/products\/289H1x1pic1.jpg?v=1668451138","url":"https:\/\/carremmcontrols.com\/products\/fisher-289h-high-pressure-relief-valve-1-x-1-fnpt-range-4-15-psi","provider":"Carremm Controls Ltd.","version":"1.0","type":"link"}