{"id":8069,"date":"2023-08-29T08:14:03","date_gmt":"2023-08-29T08:14:03","guid":{"rendered":"https:\/\/lhm-instrumentation.eu\/?p=8069"},"modified":"2023-11-16T08:49:20","modified_gmt":"2023-11-16T08:49:20","slug":"how-to-check-valve-position","status":"publish","type":"post","link":"https:\/\/lhm-instrumentation.eu\/en\/kenniscentrum\/kalibratie\/hoe-controleren-van-de-klepstand\/","title":{"rendered":"How to keep control valve positioners in place"},"content":{"rendered":"<div class=\"wpb-content-wrapper\"><div class=\"vc_row wpb_row vc_row-fluid\"><div class=\"wpb_column vc_column_container vc_col-sm-12\"><div class=\"vc_column-inner\"><div class=\"wpb_wrapper\"><div class=\"vc_row wpb_row vc_inner vc_row-fluid vc_row-o-content-middle vc_row-flex\"><div class=\"wpb_column vc_column_container vc_col-sm-12\"><div class=\"vc_column-inner\"><div class=\"wpb_wrapper\">\n\t<div class=\"wpb_text_column wpb_content_element\" >\n\t\t<div class=\"wpb_wrapper\">\n\t\t\t<p><img loading=\"lazy\" decoding=\"async\" class=\"alignright wp-image-8070\" src=\"https:\/\/lhm-instrumentation.eu\/wp-content\/uploads\/2023\/08\/kleppen-300x200.jpg\" alt=\"\" width=\"450\" height=\"300\" srcset=\"https:\/\/lhm-instrumentation.eu\/wp-content\/uploads\/2023\/08\/kleppen-300x200.jpg 300w, https:\/\/lhm-instrumentation.eu\/wp-content\/uploads\/2023\/08\/kleppen-1024x682.jpg 1024w, https:\/\/lhm-instrumentation.eu\/wp-content\/uploads\/2023\/08\/kleppen-768x511.jpg 768w, https:\/\/lhm-instrumentation.eu\/wp-content\/uploads\/2023\/08\/kleppen-370x246.jpg 370w, https:\/\/lhm-instrumentation.eu\/wp-content\/uploads\/2023\/08\/kleppen-1200x799.jpg 1200w, https:\/\/lhm-instrumentation.eu\/wp-content\/uploads\/2023\/08\/kleppen-360x240.jpg 360w, https:\/\/lhm-instrumentation.eu\/wp-content\/uploads\/2023\/08\/kleppen-200x133.jpg 200w, https:\/\/lhm-instrumentation.eu\/wp-content\/uploads\/2023\/08\/kleppen-400x266.jpg 400w, https:\/\/lhm-instrumentation.eu\/wp-content\/uploads\/2023\/08\/kleppen-100x67.jpg 100w, https:\/\/lhm-instrumentation.eu\/wp-content\/uploads\/2023\/08\/kleppen.jpg 1394w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><span style=\"color: #3161a5;\">Valves, the actuators that move them and the electronic circuits that control them, are designed for intensive daily use. A valve can be moved hundreds to tens of thousands of times over a period of one year. This can cause screws to shift, springs to weaken and mechanical connections to loosen. The valve seat wears out both from the repeated movement of the valve and from the liquid or gas flowing through it.<\/span><\/p>\n<p>In addition, electronic components suffer from \u2018calibration drift\u2019, causing valves to fail to open or close completely, close prematurely or operate erratically. This results in the gas or liquid flowing through them no longer being regulated properly.<\/p>\n<p>To avoid this, it is important to establish a preventive maintenance programme where the positioners are regularly checked in the field. These checks should be carried out quickly to minimise downtime. When calibration drift occurs, a quick recalibration should be performed.<\/p>\n\n\t\t<\/div>\n\t<\/div>\n<div class=\"vc_empty_space\"   style=\"height: 32px\"><span class=\"vc_empty_space_inner\"><\/span><\/div>\n\t<div class=\"wpb_text_column wpb_content_element\" >\n\t\t<div class=\"wpb_wrapper\">\n\t\t\t<p style=\"text-align: center;\"><a class=\"maxbutton-6 maxbutton maxbutton-vraag-advies-aan-onze-experts\" target=\"_blank\" rel=\"noopener\" href=\"https:\/\/lhm-instrumentation.eu\/en\/contact\/\"><span class='mb-text'>Ask our experts for advice<\/span><\/a><\/p>\n\n\t\t<\/div>\n\t<\/div>\n<\/div><\/div><\/div><\/div><div class=\"vc_empty_space\"   style=\"height: 64px\"><span class=\"vc_empty_space_inner\"><\/span><\/div>\n\t<div class=\"wpb_text_column wpb_content_element\" >\n\t\t<div class=\"wpb_wrapper\">\n\t\t\t<h4>Six steps for checking valve position<\/h4>\n<p>The following are the basic steps for checking the valve position. Always refer to the valve manufacturer's specific instructions for testing and calibrating the positioner.<\/p>\n<p><strong>1. Setting<\/strong><br \/>\nSet the <a href=\"https:\/\/lhm-instrumentation.eu\/en\/product\/fluke-789-process-multimeter\/\">Fluke 789<\/a> Set ProcessMeter in source mode using the appropriate current range for the positioner.<\/p>\n<p>Connect the test leads to the mA source outputs on the Fluke 789.<br \/>\nSelect the 4-20 mA range by turning the rotary knob from Off to the orange upper mA output position.<br \/>\nConnect the Fluke 789 to the inputs of the valve.<\/p>\n<p><strong>2. Testing the closing of the valve<\/strong><br \/>\nTo determine whether a positioner closes the valve completely at the 4.0 mA current level.<\/p>\n<p>Set the source current to 4.0 mA on the Fluke 789 ProcessMeter by pressing the 0% button under the SpanCheck button.<br \/>\nWhile checking that the valve moves, press the Coarse Down button once to reduce the current to 3.9 mA. The valve should not move.<br \/>\nAdjust the zero setting on the positioner to set the valve for the desired closure.<\/p>\n<p><strong>3. Testing the opening of the valve<\/strong><br \/>\nTo check valve opening, press the Coarse Range button when the current source is set to 4.0 mA. The Fluke 789 ProcessMeter increases the current by 0.1 mA with each press of the Coarse Range button.<\/p>\n<p>Note: When setting the point at which the valve starts to open, make sure that the actuator does not exert back pressure against the force holding the valve closed when 4.0 mA is applied to the controller input.<\/p>\n<p>In a spring-closing valve, no pressure should be applied to the diaphragm.<br \/>\nIn a double-acting piston actuator, no pressure may be applied to one side of the piston.<br \/>\nYou can set the point at which the valve starts to open between 4.1 and 4.2 mA to ensure no back pressure is applied against the forces at the closed setting.<\/p>\n<p><strong>4. Range position testing<\/strong><br \/>\nRange position testing involves testing the valve in the fully open position.<\/p>\n<p>Press the SpanCheck 100% button, which moves the source current to 20 mA. Use the range buttons on the Fluke 789 ProcessMeter to adjust the source current for a reading of 20 mA and wait for the valve to stabilise.<br \/>\nWhile visually checking or sensing the valve movement, press the Coarse Up button once to 20.1 mA.<br \/>\nUse the Coarse knob to adjust the current up and down between 20.1 mA and 19.9 mA. The valve stem should not move between 20.1 to 20 mA and move slightly between 20 mA and 19.9 mA.<\/p>\n<p><strong>5. Linearity testing<\/strong><br \/>\nFor valves with linear operation.<\/p>\n<p>Set the Fluke 789 ProcessMeter to 4 mA.<br \/>\nUse the % Step button to increase the current to 12 mA (50%) and confirm that the valve position indicator is at 50% of stroke.<br \/>\nNote: If your valve is not linear, refer to the valve manual for proper operation.<\/p>\n<p><strong>6. Testing smooth operation of valve<\/strong><br \/>\nSet the rotary switch to the lower mA output and select the Slow Ramp function with the blue button.<br \/>\nRun the Fluke 789 ProcessMeter through several cycles while visually checking or feeling that the valves are operating normally. The valve should NOT rock or chase any of the Slow Ramp step positions, nor move slowly.<br \/>\nAdjust the gain of the valve regulator to the point that gives the best response between these two conditions.<\/p>\n\n\t\t<\/div>\n\t<\/div>\n<div class=\"vc_empty_space\"   style=\"height: 64px\"><span class=\"vc_empty_space_inner\"><\/span><\/div>\n\t<div class=\"wpb_text_column wpb_content_element\" >\n\t\t<div class=\"wpb_wrapper\">\n\t\t\t<h4><img loading=\"lazy\" decoding=\"async\" class=\"alignright wp-image-8074\" src=\"https:\/\/lhm-instrumentation.eu\/wp-content\/uploads\/2023\/08\/fluke-789FC-296x300.jpg\" alt=\"\" width=\"300\" height=\"304\" srcset=\"https:\/\/lhm-instrumentation.eu\/wp-content\/uploads\/2023\/08\/fluke-789FC-296x300.jpg 296w, https:\/\/lhm-instrumentation.eu\/wp-content\/uploads\/2023\/08\/fluke-789FC-356x360.jpg 356w, https:\/\/lhm-instrumentation.eu\/wp-content\/uploads\/2023\/08\/fluke-789FC-360x364.jpg 360w, https:\/\/lhm-instrumentation.eu\/wp-content\/uploads\/2023\/08\/fluke-789FC-198x200.jpg 198w, https:\/\/lhm-instrumentation.eu\/wp-content\/uploads\/2023\/08\/fluke-789FC-395x400.jpg 395w, https:\/\/lhm-instrumentation.eu\/wp-content\/uploads\/2023\/08\/fluke-789FC-100x100.jpg 100w, https:\/\/lhm-instrumentation.eu\/wp-content\/uploads\/2023\/08\/fluke-789FC.jpg 494w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/>Five ways Fluke Connect features improve positioner testing in the field<\/h4>\n<p>The <a href=\"https:\/\/lhm-instrumentation.eu\/en\/product\/fluke-789-process-multimeter\/\">Fluke 789 FC<\/a> ProcessMeter and temperature kit offers all the power and capabilities of the Fluke 789 ProcessMeter and the FC connector that gives you access to all the capabilities of the Fluke Connect app on your smartphone, including the ability to:<\/p>\n<p>1. Archive measurements with the EquipmentLog\u2122 history feature in Fluke Cloud\u2122 storage for documentation and future reference in the field.<\/p>\n<p>2. Compare real-time measurements with historical data.<\/p>\n<p>3. Contact other technicians and your manager via a ShareLive\u2122 video call function to show them exactly what you see and get instant feedback.<\/p>\n<p>4. Stay further away from hazardous environments by placing the Fluke 789 FC ProcessMeter at the valve and viewing the results on your smartphone.<\/p>\n<p>5. View digital product manuals, application advice from Fluke and other field resources via your smartphone.<\/p>\n\n\t\t<\/div>\n\t<\/div>\n<div class=\"vc_empty_space\"   style=\"height: 32px\"><span class=\"vc_empty_space_inner\"><\/span><\/div>\n\t<div class=\"wpb_text_column wpb_content_element\" >\n\t\t<div class=\"wpb_wrapper\">\n\t\t\t<p style=\"text-align: center;\"><a class=\"maxbutton-5 maxbutton maxbutton-informatie-aanvragen\" target=\"_blank\" rel=\"noopener\" href=\"https:\/\/lhm-instrumentation.eu\/en\/contact\/\"><span class='mb-text'>Requesting information<\/span><\/a><\/p>\n\n\t\t<\/div>\n\t<\/div>\n<div class=\"vc_empty_space\"   style=\"height: 100px\"><span class=\"vc_empty_space_inner\"><\/span><\/div><\/div><\/div><\/div><\/div>\n<\/div>","protected":false},"excerpt":{"rendered":"De kleppen, de actuators die ze bewegen en de elektronische circuits die ze aansturen, zijn ontworpen voor intensief dagelijks gebruik. Een klep kan over een periode van \u00e9\u00e9n jaar honderden tot tienduizenden keren worden bewogen. Dit kan ertoe leiden dat...","protected":false},"author":9,"featured_media":8070,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[280,279],"tags":[],"class_list":["post-8069","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-kalibratie","category-kenniscentrum"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>controleren van de klepstand, regelklepstandstellers kalibreren<\/title>\n<meta name=\"description\" content=\"kalibreren en controleren van de klepstand in detail uitgelegd met praktijkadvies en preventief onderhoudsplan van LHM Instrumentation\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" 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