{"id":2863,"date":"2026-10-29T11:26:40","date_gmt":"2026-10-29T10:26:40","guid":{"rendered":"https:\/\/www.ludwig-hunger.de\/product-ranges\/marine\/valve-reconditioning-by-grinding\/vkm4a\/"},"modified":"2026-11-10T14:20:53","modified_gmt":"2026-11-10T13:20:53","slug":"vkm4a","status":"publish","type":"page","link":"https:\/\/www.ludwig-hunger.de\/en\/product-ranges\/marine\/valve-reconditioning-by-grinding\/vkm4a\/","title":{"rendered":"VKM4A"},"content":{"rendered":"\t\t
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\n\t\t\t\t\t\t\n\t\t\t\t\t\t\tVKM4A\t\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/h2>\n\t\t\t\t\n\t\t\t\t\n\t\t\t<\/div>\n\t\t\t\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\n<\/div>\n
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Home<\/a> \/<\/span> Page<\/span><\/div>\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\n<\/div>\n\n<\/div>\n\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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VKM4A\n\n<\/h2>\t\t\t\t<\/div>\n\t\t
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Valve grinding machine <\/strong>for valves with stem diameters up to 40 mm<\/strong><\/p>

Field of application:<\/h3>

Thanks to its rugged design, the VKM4A is particularly well suited for continuous duty in engine reconditioning workshops.<\/p>

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Technical data:<\/h3>\n <\/td>\n

  \n <\/td>\n\n<\/tr>\n\n
Operating range:<\/b>\n <\/td>\n  \n <\/td>\n\n<\/tr>\n\n
Valve stem \u00d8 \n <\/td>\n 9 – 40 mm\n <\/td> \n\n<\/tr>\n\n
Max. valve head \u00d8\n <\/td>\n 320 mm \n <\/td> \n\n<\/tr>\n\n
Valve seat angle\n <\/td>\n 0\u00b0 – 90\u00b0\n <\/td> \n\n<\/tr>\n\n
Grinding spindle:<\/b>\n <\/td>\n  \n <\/td>\n\n<\/tr>\n\n
Grinding wheel \u00d8 \n <\/td>\n 250 mm\n <\/td> \n\n<\/tr>\n\n
Speed at 50 Hz \n <\/td>\n 2,800 rpm\n <\/td> \n\n<\/tr>\n\n
Workhead spindle:<\/b>\n <\/td>\n  \n <\/td>\n\n<\/tr>\n\n
Speed\n <\/td>\n 5 – 50 rpm\n <\/td> \n\n<\/tr>\n\n
 <\/b>Coolant system:<\/b>\n <\/td>\n  \n <\/td>\n\n<\/tr>\n\n
Capacity\n <\/td>\n 5 liters\n <\/td> \n\n<\/tr>\n\n
Electrical equipment:<\/b>\n <\/td>\n  \n <\/td>\n\n<\/tr>\n\n
Supply voltage\n <\/td>\n 400 V \u00b1 10%\n <\/td> \n\n<\/tr>\n\n
(3-phase 50\/60 Hz) or\n <\/td>\n 230 V \u00b1 10%\n <\/td> \n\n<\/tr>\n\n
Power consumption\n <\/td>\n 0.6 kW\n <\/td> \n\n<\/tr>\n\n
Dimensions:<\/b>\n <\/td>\n  \n <\/td>\n\n<\/tr>\n\n
Length\n <\/td>\n 1550 mm\n <\/td> \n\n<\/tr>\n\n
Width\n <\/td>\n 900 mm\n <\/td> \n\n<\/tr>\n\n
Max. height\n <\/td>\n 1250 mm\n <\/td> \n\n<\/tr>\n\n
Weight:<\/b>\n <\/td>\n  \n <\/td>\n\n<\/tr>\n\n
Net weight\n <\/td>\n 300 kg\n <\/td> \n\n<\/tr>\n\n<\/table>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t
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<\/p>

Features:<\/h3>\n

Machine bed:<\/b>Heavily ribbed cast-iron body with mounted wheelhead.<\/p>\n

Wheelhead:<\/b>The maintenance-free, high-performance motorized grinding spindle is housed in a box-shaped wheelhead that provides exceptional vibration damping.<\/p>\n

Dressing unit:<\/b>For dressing the grinding wheel, a handwheel-operated dressing slide is mounted in the wheelhead, allowing wheel dressing even while the valve remains clamped.<\/p>\n

Workhead:<\/b>Monolithic cast-iron body with maintenance-free bearings for the workhead spindle. Valve clamping via collets.Elongated swivel plate with fine adjustment for the grinding angle.Low-friction longitudinal guide of the workhead carriage on steel shafts for smooth movement of the valve along the grinding wheel.The workhead can be positioned on the swivel plate so that each valve is clamped precisely in the stem section that normally operates within the valve guide. A steady rest (optional) can be mounted on the swivel plate to provide additional support for long valves.<\/p>\n

Coolant system:<\/b>The coolant tank is accommodated as a pull-out drawer inside the machine bed and can be easily withdrawn for cleaning.<\/p>\n

Steady rest:<\/b>For providing additional support to valves with stem diameters of 16 – 40 mm.<\/p>\n

Automatic oscillation mechanism with switch cams:<\/b>The automatic oscillation mechanism produces a reciprocating movement of the grinding wheel along the seat face of the valve head, ensuring high stock removal rates combined with an optimal surface finish.Not required when equipped with the digital automatic infeed and oscillation unit.<\/p>\n

Ball screw system (optional):<\/b>For the automatic oscillation mechanism in continuous operation. The ball screw executes the precise longitudinal movements of the workhead.Required when using the digital automatic infeed and oscillation unit.<\/p>\n

Digital automatic infeed and oscillation unit (optional) – new version available since 2023:<\/b>The automatic infeed performs incremental feeds of the grinding wheel according to a preselected grinding program.The number of feed steps, feed intervals, the oscillating stroke of the valve, and the spark-out time can all be preselected.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\n<\/div>\n

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Download VKM4A Brochure\n\n\n<\/h3>\t\t\t\t<\/div>\n\t\t\t\t
\n\t\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\n\t\t\t\t\t\t\n\t\t\t\t<\/path><\/svg>\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\tDownload PDF<\/span>\n\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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\"\"Field of application: With the PHM mobile honing machine, cylinder liners of large diesel engines can be honed while still installed in the crankcase. The stationary HMB honing machine base is required for honing removed cylinder liners.View details<\/a><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\n<\/div>\n\n<\/div>\n\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"

VKM4A Home \/ Product Ranges \/ Marine \/ Valve Reconditioning by Grinding \/ VKM4A VKM4A Valve grinding machine for valves with stem diameters up to 40 mm Field of application: Thanks to its rugged design, the VKM4A is particularly well suited for continuous duty in engine reconditioning workshops. Technical data:   Operating range:   Valve […]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":2729,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_eb_attr":"","_templately_pack_id":"","_templately_imported_at":"","_templately_source":"","_templately_import_session_id":"","site-sidebar-layout":"no-sidebar","site-content-layout":"","ast-site-content-layout":"full-width-container","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":"disabled","ast-breadcrumbs-content":"","ast-featured-img":"disabled","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","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":""},"class_list":["post-2863","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.ludwig-hunger.de\/en\/wp-json\/wp\/v2\/pages\/2863","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.ludwig-hunger.de\/en\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/www.ludwig-hunger.de\/en\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/www.ludwig-hunger.de\/en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.ludwig-hunger.de\/en\/wp-json\/wp\/v2\/comments?post=2863"}],"version-history":[{"count":1,"href":"https:\/\/www.ludwig-hunger.de\/en\/wp-json\/wp\/v2\/pages\/2863\/revisions"}],"predecessor-version":[{"id":2865,"href":"https:\/\/www.ludwig-hunger.de\/en\/wp-json\/wp\/v2\/pages\/2863\/revisions\/2865"}],"up":[{"embeddable":true,"href":"https:\/\/www.ludwig-hunger.de\/en\/wp-json\/wp\/v2\/pages\/2729"}],"wp:attachment":[{"href":"https:\/\/www.ludwig-hunger.de\/en\/wp-json\/wp\/v2\/media?parent=2863"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}