{"id":4689,"date":"2026-01-21T23:38:47","date_gmt":"2026-01-21T23:38:47","guid":{"rendered":"https:\/\/yunrui-controls.com\/?post_type=products&#038;p=4689"},"modified":"2026-03-29T16:13:44","modified_gmt":"2026-03-29T16:13:44","slug":"fisher-type-lr128","status":"publish","type":"products","link":"https:\/\/www.yunrui-controls.com\/th\/products\/fisher-type-lr128\/","title":{"rendered":"\u0e27\u0e32\u0e25\u0e4c\u0e27\u0e23\u0e30\u0e1a\u0e32\u0e22\u0e41\u0e23\u0e07\u0e14\u0e31\u0e19\u0e2b\u0e23\u0e37\u0e2d\u0e15\u0e31\u0e27\u0e04\u0e27\u0e1a\u0e04\u0e38\u0e21\u0e41\u0e23\u0e07\u0e14\u0e31\u0e19\u0e22\u0e49\u0e2d\u0e19\u0e01\u0e25\u0e31\u0e1a\u0e41\u0e1a\u0e1a\u0e43\u0e0a\u0e49\u0e41\u0e23\u0e07\u0e14\u0e31\u0e19\u0e19\u0e33\u0e23\u0e48\u0e2d\u0e07 \u0e23\u0e38\u0e48\u0e19 LR128 \u0e02\u0e2d\u0e07 Fisher"},"content":{"rendered":"<h2 data-path-to-node=\"4\">\u0e1b\u0e23\u0e30\u0e42\u0e22\u0e0a\u0e19\u0e4c\u0e41\u0e25\u0e30\u0e02\u0e49\u0e2d\u0e14\u0e35\u0e17\u0e35\u0e48\u0e2a\u0e33\u0e04\u0e31\u0e0d<\/h2>\n<ul data-path-to-node=\"5\">\n<li>\n<p data-path-to-node=\"5,0,0\"><span class=\"citation-3425 citation-end-3425\">Superior Debris Protection: The LR128 is built for &#8220;dirty&#8221; liquid environments.<\/span> <span class=\"citation-3424 citation-end-3424\">The internal flow path is specifically engineered to deflect particulates away from the critical seating surfaces.<\/span> <span class=\"citation-3423 citation-end-3423\">Furthermore, an integrated stainless steel inlet strainer captures larger debris before it can enter the main valve, preventing the erosion and seat damage that often plague standard relief valves.<\/span><\/p>\n<\/li>\n<li>\n<p data-path-to-node=\"5,1,0\"><span class=\"citation-3422 citation-end-3422\">Metal Plug Design: The use of a robust metal plug eliminates the common failure points of flexible element or boot-style regulators, such as tearing, swelling, or degradation over time.<\/span> This design ensures a consistent, tight shutoff and a much higher degree of mechanical durability.<\/p>\n<\/li>\n<li>\n<p data-path-to-node=\"5,2,0\"><span class=\"citation-3421 citation-end-3421\">Smooth and Stable Operation: The pilot-operated architecture ensures that the valve opens and closes gradually and precisely.<\/span> This smooth operation is critical in liquid systems to prevent the water hammer and pressure surges that can occur with fast-acting, direct-operated relief valves.<\/p>\n<\/li>\n<li>\n<p data-path-to-node=\"5,3,0\"><span class=\"citation-3420 citation-end-3420\">In-Service Travel Indicator: A standard visual travel indicator allows maintenance personnel to verify the position of the main valve plug during operation.<\/span> This feature simplifies troubleshooting and performance monitoring without the need to take the system offline.<\/p>\n<\/li>\n<li>\n<p data-path-to-node=\"5,4,0\"><span class=\"citation-3419 citation-end-3419\">Thorough Laboratory Testing: Like all Fisher products, the LR128 has undergone extensive flow and endurance testing.<\/span> This ensures that the published relief capacities are accurate and that the valve will perform reliably during emergency overpressure events.<\/p>\n<\/li>\n<li>\n<p data-path-to-node=\"5,5,0\"><span class=\"citation-3418 citation-end-3418\">Easily Maintained Pilot: The control pilot is designed for simplicity and accessibility.<\/span> It can be serviced or adjusted in the field with minimal tools, ensuring that the backpressure or relief setpoint remains accurate over the life of the installation.<\/p>\n<\/li>\n<li>\n<p data-path-to-node=\"5,6,0\"><span class=\"citation-3417 citation-end-3417\">Tight Shutoff: The combination of precision-machined metal internals and high-quality seating materials allows the LR128 to achieve a bubble-tight seal, preventing fluid loss when the system is operating below the relief setpoint.<\/span><\/p>\n<\/li>\n<\/ul>\n<h3 data-path-to-node=\"6\">\u0e04\u0e38\u0e13\u0e2a\u0e21\u0e1a\u0e31\u0e15\u0e34\u0e17\u0e32\u0e07\u0e40\u0e17\u0e04\u0e19\u0e34\u0e04<\/h3>\n<ul data-path-to-node=\"7\">\n<li>\n<p data-path-to-node=\"7,0,0\"><span class=\"citation-3416 citation-end-3416\">Operation: Pilot-operated relief or backpressure.<\/span><\/p>\n<\/li>\n<li>\n<p data-path-to-node=\"7,1,0\"><span class=\"citation-3415 citation-end-3415\">Service: Liquids (Water, Liquid Fuels, Process Fluids).<\/span><\/p>\n<\/li>\n<li>\n<p data-path-to-node=\"7,2,0\">Body Sizes: Available in standard industrial sizes, typically ranging from NPS 1 through NPS 8.<\/p>\n<\/li>\n<li>\n<p data-path-to-node=\"7,3,0\">Pressure Ratings: Designed to meet high-pressure industrial piping standards.<\/p>\n<\/li>\n<li>\n<p data-path-to-node=\"7,4,0\">End Connections: Flanged connections (ANSI\/ASME) for easy integration into high-volume liquid headers.<\/p>\n<\/li>\n<li>\n<p data-path-to-node=\"7,5,0\">Materials: Durable cast iron or steel bodies with corrosion-resistant internal trim.<\/p>\n<\/li>\n<\/ul>\n<h4 data-path-to-node=\"8\">\u0e02\u0e2d\u0e1a\u0e40\u0e02\u0e15\u0e01\u0e32\u0e23\u0e43\u0e0a\u0e49\u0e07\u0e32\u0e19<\/h4>\n<p data-path-to-node=\"9\"><span class=\"citation-3414 citation-end-3414\">The Type LR128 is the ideal choice for liquid systems where precision backpressure control and debris resistance are essential.<\/span><\/p>\n<h5 data-path-to-node=\"10\">\u0e2d\u0e38\u0e15\u0e2a\u0e32\u0e2b\u0e01\u0e23\u0e23\u0e21\u0e2b\u0e25\u0e31\u0e01\u0e41\u0e25\u0e30\u0e01\u0e32\u0e23\u0e43\u0e0a\u0e49\u0e07\u0e32\u0e19:<\/h5>\n<ul data-path-to-node=\"11\">\n<li>\n<p data-path-to-node=\"11,0,0\">Pump Bypass Systems: Maintaining constant pump discharge pressure by recirculating excess liquid back to a storage tank.<\/p>\n<\/li>\n<li>\n<p data-path-to-node=\"11,1,0\">Water Distribution: Acting as a high-capacity relief valve to protect municipal and industrial pipelines from overpressure.<\/p>\n<\/li>\n<li>\n<p data-path-to-node=\"11,2,0\">Fuel Loading Racks: Managing backpressure during the high-volume transfer of liquid fuels and oils.<\/p>\n<\/li>\n<li>\n<p data-path-to-node=\"11,3,0\">Fire Protection Headers: Ensuring stable pressure in fire water systems by relieving excess pressure during pump starts.<\/p>\n<\/li>\n<\/ul>\n<h3 data-path-to-node=\"13\"><\/h3>","protected":false},"excerpt":{"rendered":"<p>The Fisher Type LR128 is a rugged, pilot-operated regulator specifically engineered for liquid service, acting as either a relief valve or a backpressure regulator. While its sister model (the LR125) focuses on pressure reduction, the LR128 is designed to maintain a constant upstream pressure by venting excess liquid or holding backpressure on a system. By utilizing an internally actuated metal plug instead of a flexible boot or sleeve, the LR128 offers superior reliability and a longer service life, particularly in demanding industrial or utility environments where fluid cleanliness can be an issue.<\/p>","protected":false},"author":1,"featured_media":4690,"parent":0,"menu_order":628,"comment_status":"open","ping_status":"open","template":"","format":"standard","meta":{"_acf_changed":false,"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"default","adv-header-id-meta":"","stick-header-meta":"default","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center 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center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"tags":[311,314],"brands":[112,308],"model_series":[],"industries":[53,59],"product_cat":[309],"class_list":["post-4689","products","type-products","status-publish","format-standard","has-post-thumbnail","hentry","tag-fisher","tag-regulators-relief-valves","brands-fisher","brands-regulators-relief-valves","industries-oil-gas","industries-water-wastewater","product_cat-regulators-relief-valves"],"acf":{"body_sizes_and_end_connection_styles":"Body Sizes: NPS 1 \/ 2 \/ 3 \/ 4 | DN 25 \/ 50 \/ 80 \/ 100\r\nEnd Connections: NPT \/ SWE \/ CL150RF \/ CL300RF \/ CL600RF \/ PN 16\/25\/40","temperature_capabilities":"17E68 Nitrile (NBR):?-20 to 150\u00b0F \/ -29 to 66\u00b0C | 17E97 Nitrile (NBR): 0 to 150\u00b0F \/ -18 to 66\u00b0C | 17E88 Fluorocarbon (FKM): 0 to 250\u00b0F \/ -18 to 121\u00b0C","maximum_inlet_pressure":"450 PSIG \/ 31 bar | Or body rating limit, whichever is lower","maximum_outlet_pressures":"450 PSIG \/ 31 bar | Or body rating limit, whichever is lower","outlet_pressure_ranges":"","pressure_registration":"External","available_low_pressure_configurations":"","available_high_pressure_configurations":"","available_pressure_differential_configurations":"","body_and_spring_case_materials":"","approximate_weights":"","available_backpressure_constructions":"","available_high_pressure_differential_constructions":"","available_constructions":"","main_valve_pressure_ratings":"","allowable_inlet_pressure":"","allowable_outlet_pressure":"","orifice_sizes":"","external_registration_connection":"","hydrogen_h2":"","capacity":"","gauge_outlet":"","maximum_temperature":"","spring_ranges":"25 to 375 PSIG \/ 1.7 to 25.9 bar","token_relief":"","type_tm600_true-monitor\u2122_specifications":"","type_vsx4_slam-shut_module_specifications":"","maximum_allowable_pressures":"","hydrogen_configurations":"","datasheet":4691,"live_photos":"","available_certificates":"","available_logistics":""},"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v26.8 (Yoast SEO v26.8) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Wholesale Fisher Type LR128 | Top China Supplier<\/title>\n<meta name=\"description\" content=\"Searching for a trusted Fisher Type LR128 Pilot-Operated Pressure Relief Valve Or Backpressure Regulator supplier? We provide 100% original, brand new u...\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.yunrui-controls.com\/th\/products\/fisher-type-lr128\/\" \/>\n<meta property=\"og:locale\" content=\"th_TH\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Fisher Type LR128 Pilot-Operated Pressure Relief Valve Or Backpressure Regulator\" \/>\n<meta property=\"og:description\" content=\"Searching for a trusted Fisher Type LR128 Pilot-Operated Pressure Relief Valve Or Backpressure Regulator supplier? 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