{"id":5616,"date":"2026-01-29T10:08:11","date_gmt":"2026-01-29T10:08:11","guid":{"rendered":"https:\/\/yunrui-controls.com\/?post_type=products&#038;p=5616"},"modified":"2026-03-29T16:19:21","modified_gmt":"2026-03-29T16:19:21","slug":"fisher-657-diaphragm-actuator","status":"publish","type":"products","link":"https:\/\/www.yunrui-controls.com\/th\/products\/fisher-657-diaphragm-actuator\/","title":{"rendered":"Fisher 657 Diaphragm Actuator | Direct-Acting Pneumatic Precision"},"content":{"rendered":"<h3 data-path-to-node=\"2\">\u0e02\u0e49\u0e2d\u0e44\u0e14\u0e49\u0e40\u0e1b\u0e23\u0e35\u0e22\u0e1a\u0e17\u0e32\u0e07\u0e40\u0e17\u0e04\u0e19\u0e34\u0e04\u0e17\u0e35\u0e48\u0e2a\u0e33\u0e04\u0e31\u0e0d\u0e02\u0e2d\u0e07\u0e1c\u0e25\u0e34\u0e15\u0e20\u0e31\u0e13\u0e11\u0e4c<\/h3>\n<ul data-path-to-node=\"3\">\n<li>\n<p data-path-to-node=\"3,0,0\">Streamlined Mounting &amp; Tubing: The 657 features an integral mounting pad, which removes the need for traditional brackets and reduces the parts required for assembly. When used with Fisher FIELDVUE\u2122 instruments, an integral air passage eliminates external tubing, significantly reducing the risk of leaks and mechanical damage.<\/p>\n<\/li>\n<li>\n<p data-path-to-node=\"3,1,0\">High-Response Design: By utilizing a shallow casing on the pressure side, the internal volume is minimized. This design ensures faster response times to signal changes, making it ideal for precision throttling applications where process stability is critical.<\/p>\n<\/li>\n<li>\n<p data-path-to-node=\"3,2,0\">Linear Thrust Delivery: The actuator employs a molded diaphragm that travels within a deep casing. This architecture minimizes the change in effective diaphragm area throughout the stroke, ensuring consistent thrust and linear movement across the entire travel range.<\/p>\n<\/li>\n<li>\n<p data-path-to-node=\"3,3,0\">Industrial Durability: Constructed from thick-walled cast iron and steel, the 657 provides superior stability and corrosion protection. This heavy-duty build is specifically engineered to withstand the vibration and harsh atmospheric conditions of refineries and chemical plants.<\/p>\n<\/li>\n<\/ul>\n<h4 data-path-to-node=\"4\">\u0e02\u0e49\u0e2d\u0e21\u0e39\u0e25\u0e08\u0e33\u0e40\u0e1e\u0e32\u0e30\u0e2b\u0e25\u0e31\u0e01<\/h4>\n<table data-path-to-node=\"5\">\n<thead>\n<tr>\n<td><strong>\u0e04\u0e38\u0e13\u0e2a\u0e21\u0e1a\u0e31\u0e15\u0e34<\/strong><\/td>\n<td><strong>\u0e02\u0e49\u0e2d\u0e01\u0e33\u0e2b\u0e19\u0e14\u0e17\u0e32\u0e07\u0e40\u0e17\u0e04\u0e19\u0e34\u0e04<\/strong><\/td>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td><span data-path-to-node=\"5,1,0,0\">Actuation Type<\/span><\/td>\n<td><span data-path-to-node=\"5,1,1,0\">Pneumatic Direct-Acting (Air-to-Close)<\/span><\/td>\n<\/tr>\n<tr>\n<td><span data-path-to-node=\"5,2,0,0\">Sizes<\/span><\/td>\n<td><span data-path-to-node=\"5,2,1,0\">30, 34, 40, 45, 46, 50, 60, 70, 80, 100<\/span><\/td>\n<\/tr>\n<tr>\n<td><span data-path-to-node=\"5,3,0,0\">\u0e27\u0e31\u0e2a\u0e14\u0e38<\/span><\/td>\n<td><span data-path-to-node=\"5,3,1,0\">Cast Iron and Steel<\/span><\/td>\n<\/tr>\n<tr>\n<td><span data-path-to-node=\"5,4,0,0\">\u0e0a\u0e48\u0e27\u0e07\u0e01\u0e32\u0e23\u0e40\u0e14\u0e34\u0e19\u0e17\u0e32\u0e07<\/span><\/td>\n<td><span data-path-to-node=\"5,4,1,0\">Up to 102 mm (4 inches) depending on size<\/span><\/td>\n<\/tr>\n<tr>\n<td><span data-path-to-node=\"5,5,0,0\">\u0e2d\u0e38\u0e13\u0e2b\u0e20\u0e39\u0e21\u0e34\u0e43\u0e19\u0e01\u0e32\u0e23\u0e17\u0e33\u0e07\u0e32\u0e19<\/span><\/td>\n<td><span data-path-to-node=\"5,5,1,0\">-40\u00b0C to +82\u00b0C (Standard); higher with special diaphragms<\/span><\/td>\n<\/tr>\n<tr>\n<td><span data-path-to-node=\"5,6,0,0\">\u0e01\u0e32\u0e23\u0e04\u0e27\u0e1a\u0e04\u0e38\u0e21\u0e14\u0e49\u0e27\u0e22\u0e15\u0e19\u0e40\u0e2d\u0e07<\/span><\/td>\n<td><span data-path-to-node=\"5,6,1,0\">Top-mounted or side-mounted handwheels available<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h5 data-path-to-node=\"6\">\u0e02\u0e2d\u0e1a\u0e40\u0e02\u0e15\u0e01\u0e32\u0e23\u0e43\u0e0a\u0e49\u0e07\u0e32\u0e19<\/h5>\n<ul data-path-to-node=\"7\">\n<li>\n<p data-path-to-node=\"7,0,0\">Refining and Petrochemical: Used for throttling control in high-pressure steam and hydrocarbon lines.<\/p>\n<\/li>\n<li>\n<p data-path-to-node=\"7,1,0\">Power Generation: Automating feedwater and cooling water systems where failsafe reliability is paramount.<\/p>\n<\/li>\n<li>\n<p data-path-to-node=\"7,2,0\">Oil &amp; Gas Production: Integrated into skid-mounted equipment for pressure regulation and fluid separation.<\/p>\n<\/li>\n<li>\n<p data-path-to-node=\"7,3,0\">Pulp &amp; Paper: Managing chemical additive flows and steam drying processes.<\/p>\n<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"<p>The Fisher 657 is a rugged, spring-opposed pneumatic diaphragm actuator designed to provide dependable on\/off or throttling control for various valve types. As a direct-acting actuator, increasing air pressure on the diaphragm overcomes the spring force to push the actuator stem downward. When air pressure is reduced, the spring moves the stem upward, typically providing a fail-up (open) action for most globe valves.<\/p>","protected":false},"author":1,"featured_media":5617,"parent":0,"menu_order":402,"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 center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"tags":[336],"brands":[],"model_series":[],"industries":[53,55,60],"product_cat":[257,122],"class_list":["post-5616","products","type-products","status-publish","format-standard","has-post-thumbnail","hentry","tag-fisher-supplier","industries-oil-gas","industries-power-generation","industries-pulp-paper","product_cat-actuators","product_cat-control-valves-actuators"],"acf":{"actuation":"Spring-return, Linear","certifications":"SIL capable, ATEX, CUTR, PED","control_type":"On\/Off, Throttling","operating_temperature":"Cryogenic, Low Temperature, Standard Temperature, High Temperature","power_source":"Pneumatic, Manual","process_control":"","valve_type":"Angle Valve, Globe Valve","other_configurations":"For other specifications or options of this product, please contact us.","datasheet":5618,"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>Buy Fisher 657 Diaphragm Actuator | Original Brand New<\/title>\n<meta name=\"description\" content=\"Request a competitive quote for the Fisher 657 Diaphragm Actuator today. 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