{"id":21935,"date":"2017-08-14T13:45:53","date_gmt":"2017-08-14T17:45:53","guid":{"rendered":"https:\/\/www.mdaturbines.com\/?p=21935"},"modified":"2022-05-13T14:52:38","modified_gmt":"2022-05-13T18:52:38","slug":"throttle-valve-seat-upgrades","status":"publish","type":"post","link":"https:\/\/www.mdaturbines.com\/es\/resources\/throttle-valve-seat-upgrades\/","title":{"rendered":"Throttle Valve Seat Upgrade"},"content":{"rendered":"<p>MD&amp;A was contracted to modify both the left and the right-hand side throttle valves on a Westinghouse\u00ae steam turbine. The work was done at the power plant and was designed to reduce distortion on the valve casing, as well as the bonnet fit, and stud threads. As the on-site work was being performed, highly skilled technicians at our St. Louis Turbine-Generator Repair facility performed the in-shop throttle valve bonnet modifications.<\/p>\n<p>MD&amp;A provided management, engineering, labor, materials, and equipment for both the on and off-site projects.<\/p>\n<p><a href=\"https:\/\/www.mdaturbines.com\/wp-content\/uploads\/2017\/08\/IMG_3741-edited-08-02-17.jpg\"><img decoding=\"async\" class=\"aligncenter size-medium wp-image-21939\" src=\"https:\/\/www.mdaturbines.com\/wp-content\/uploads\/2017\/08\/IMG_3741-edited-08-02-17-300x225.jpg\" alt=\"Throttle Valve Seat Upgrade\" width=\"300\" height=\"225\" srcset=\"https:\/\/www.mdaturbines.com\/wp-content\/uploads\/2017\/08\/IMG_3741-edited-08-02-17-300x225.jpg 300w, https:\/\/www.mdaturbines.com\/wp-content\/uploads\/2017\/08\/IMG_3741-edited-08-02-17-213x160.jpg 213w, https:\/\/www.mdaturbines.com\/wp-content\/uploads\/2017\/08\/IMG_3741-edited-08-02-17-90x68.jpg 90w, https:\/\/www.mdaturbines.com\/wp-content\/uploads\/2017\/08\/IMG_3741-edited-08-02-17.jpg 320w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/a><\/p>\n<p>As part of the on-site work, each throttle valve received a pinned-in seat and Flexitallic\u00ae gasket modification. The old throttle valve seats were removed and new seats installed. All bore and face surfaces were machined to achieve perpendicular and concentric conditions within the valves.<\/p>\n<p>The tested and proven MD&amp;A \u201cPinned Seat\u201d design eliminates all the generic problems associated with the original seat design and incorporates the following benefits by:<\/p>\n<ul class=\"normal\">\n<li>Eliminating the support lip and most of the trepan groove, thereby removing trepan groove stress concentration areas<\/li>\n<li>Moving the seat interference fits further downstream into the chest, where the chest wall is thicker and will not yield, helping to eliminate future trepan groove cracking<\/li>\n<li>Adding an interference\/sliding fit to the tail end of the seat greatly reduces the stresses on the front end shrink fits<\/li>\n<li>Installed New Electronic Gas Valves &#8211; removal of old Hydraulic Gas Valves<\/li>\n<li>Increasing the new seat-to-casing interference contact area, equalizing stresses along the body, and reducing overall stresses on the front-end interference fits<\/li>\n<li>Adding multiple radial pins which takes the place of the seal weld as noted in the original design. These radial pins not only hold the seat in place during severe thermal cycling but also eliminate differential expansion cracking problems along the old seal weld by eliminating the need for the seal weld altogether<\/li>\n<\/ul>\n<p><a href=\"https:\/\/www.mdaturbines.com\/wp-content\/uploads\/2017\/08\/829-Edited.jpg\"><img decoding=\"async\" class=\"aligncenter size-medium wp-image-21938\" src=\"https:\/\/www.mdaturbines.com\/wp-content\/uploads\/2017\/08\/829-Edited-300x225.jpg\" alt=\"Throttle Valve Seat Upgrade\" width=\"300\" height=\"225\" srcset=\"https:\/\/www.mdaturbines.com\/wp-content\/uploads\/2017\/08\/829-Edited-300x225.jpg 300w, https:\/\/www.mdaturbines.com\/wp-content\/uploads\/2017\/08\/829-Edited-213x160.jpg 213w, https:\/\/www.mdaturbines.com\/wp-content\/uploads\/2017\/08\/829-Edited-90x68.jpg 90w, https:\/\/www.mdaturbines.com\/wp-content\/uploads\/2017\/08\/829-Edited.jpg 600w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/a><\/p>\n<p>Both the left and right-side throttle valve bonnets were blast cleaned to remove the blue blush and allow for proper non-destructive testing. Upon inspection, MD&amp;A technicians found that both the left and right-side bonnet liners had excessive blue blush build-up. While the bonnet bushings were removed, the bonnet liner bores were honed to restore the valve plug to liner clearance. The bonnet casing fits were weld built-up and final machined to restore the proper clearance to the valve body fit IDs.<\/p>\n<p>New threaded and bolted bonnet bushings were machined to the proper clearance and installed.<\/p>\n<p>The gasket sealing surfaces were machined with a phonographic finish. The casing standoff and gasket surface drop heights were machined to allow for proper crush on the new Flexitallic\u00ae gasket.<\/p>\n<p>Buttons were welded onto the outer portions of the bonnet flange face to allow for proper stud torque and compression.<\/p>\n<p><a href=\"https:\/\/www.mdaturbines.com\/wp-content\/uploads\/2017\/08\/DSC00118-Edited.jpg\"><img decoding=\"async\" class=\"aligncenter size-medium wp-image-21940\" src=\"https:\/\/www.mdaturbines.com\/wp-content\/uploads\/2017\/08\/DSC00118-Edited-300x225.jpg\" alt=\"Throttle Valve Seat Upgrade\" width=\"300\" height=\"225\" srcset=\"https:\/\/www.mdaturbines.com\/wp-content\/uploads\/2017\/08\/DSC00118-Edited-300x225.jpg 300w, https:\/\/www.mdaturbines.com\/wp-content\/uploads\/2017\/08\/DSC00118-Edited-213x160.jpg 213w, https:\/\/www.mdaturbines.com\/wp-content\/uploads\/2017\/08\/DSC00118-Edited-90x68.jpg 90w, https:\/\/www.mdaturbines.com\/wp-content\/uploads\/2017\/08\/DSC00118-Edited.jpg 600w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/a><\/p>\n<p>Lastly, the bonnets were cleaned and prepared for shipment. Then the bonnets, with sub-assemblies installed, were returned to the plant and installed.<\/p>\n<p>MD&amp;A provides inspection, repair, restoration, and upgrades of industrial and utility high-pressure valves and valve components. We offer full-service, one-stop valve repair while delivering consistent quality and value with fast response, superior communications, and innovative solutions.<\/p>\n<p><strong>Have MD&amp;A look at your valves today, call our <a href=\"https:\/\/www.mdaturbines.com\/parts\/steam-turbine\/\">Turbine-Generator Repair Facility<\/a> at (314) 880-3000, or use our <a href=\"https:\/\/www.mdaturbines.com\/contact\/\">Contact form<\/a>.<\/strong><\/p>\n<p><img decoding=\"async\" class=\"wp-image-66900 size-medium aligncenter\" src=\"https:\/\/www.mdaturbines.com\/wp-content\/uploads\/2020\/03\/Westinghouse-horizontal-throttle-valve-911-03-19-20WEB-300x225.jpg\" alt=\"Westinghouse Horizontal Throttle Valve\" width=\"300\" height=\"225\" srcset=\"https:\/\/www.mdaturbines.com\/wp-content\/uploads\/2020\/03\/Westinghouse-horizontal-throttle-valve-911-03-19-20WEB-300x225.jpg 300w, https:\/\/www.mdaturbines.com\/wp-content\/uploads\/2020\/03\/Westinghouse-horizontal-throttle-valve-911-03-19-20WEB-768x576.jpg 768w, https:\/\/www.mdaturbines.com\/wp-content\/uploads\/2020\/03\/Westinghouse-horizontal-throttle-valve-911-03-19-20WEB-213x160.jpg 213w, https:\/\/www.mdaturbines.com\/wp-content\/uploads\/2020\/03\/Westinghouse-horizontal-throttle-valve-911-03-19-20WEB-90x68.jpg 90w, https:\/\/www.mdaturbines.com\/wp-content\/uploads\/2020\/03\/Westinghouse-horizontal-throttle-valve-911-03-19-20WEB.jpg 1024w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/p>\n","protected":false},"excerpt":{"rendered":"<p>MD&amp;A was contracted to modify both the left and the right-hand side throttle valves on a Westinghouse\u00ae steam turbine. The work was done at the&#8230;<\/p>\n","protected":false},"author":2,"featured_media":21939,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"content-type":"","footnotes":""},"categories":[211,209],"tags":[77,123,125,124,122],"class_list":["post-21935","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-parts","category-steam-turbine","tag-steam-turbine","tag-throttle-valve-seat","tag-valve-bonnets","tag-valve-upgrade","tag-westinghouse"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Throttle Valve Seat Upgrade &#8211; MDA Turbines<\/title>\n<meta name=\"description\" content=\"MD&amp;A was contracted to preform a Throttle Valve Seat Upgrade for a customer&#039;s Westinghouse\u00ae steam turbine.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, 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