{"id":73237,"date":"2025-10-24T08:42:50","date_gmt":"2025-10-24T08:42:50","guid":{"rendered":"https:\/\/staging.hydnet.se\/avoid-unnecessary-heat-in-closed-loop-transmission-systems\/"},"modified":"2025-10-24T08:42:50","modified_gmt":"2025-10-24T08:42:50","slug":"avoid-unnecessary-heat-in-closed-loop-transmission-systems","status":"publish","type":"post","link":"https:\/\/hydnet.se\/en\/avoid-unnecessary-heat-in-closed-loop-transmission-systems\/","title":{"rendered":"Avoid Unnecessary Heat in Closed-Loop Transmission Systems!"},"content":{"rendered":"

In hydrostatic transmissions with closed-loop circuits, significant temperature increases and pressure spikes can occur when shock valves activate at high pressure.<\/p>\n

\n

High Heat in Closed-Loop Transmission Systems<\/strong><\/h2>\n

For example, if a shock valve opens with oil at 50\u202f\u00b0C and a flow of 1\u202fl\/min, the temperature can rise by approximately 18\u202f\u00b0C<\/strong> at a 300-bar<\/strong> pressure differential.<\/p>\n

\n

Continuous Control Solution in Bosch Rexroth\u2019s A4VG<\/strong><\/h2>\n

To protect the system, save energy that would otherwise be converted into heat, and reduce the need for cooling, pressure can be continuously relieved. A shuttle valve detects the highest pressure on drive side A or B and directs it to a pressure relief valve.<\/p>\n

When the pressure relief valve reaches its setpoint, it offloads pressure to the actuator, which then reduces the pump displacement. This eliminates the need for the shock valves to open, as both flow and pressure are continuously regulated through pump displacement control.<\/p>\n

In Bosch Rexroth\u2019s A4VG<\/strong> pump, these shuttle valves are standard, but the solution can also be retrofitted to other pump brands and machines.<\/p>\n

\n

Control Proportional Pressure Relief Valve with Pressure Sensors<\/strong><\/h2>\n

You can also use pressure sensors on drive sides A & B to control a proportional pressure relief valve. Based on the sensor readings, the actuator adjusts the pump displacement dynamically.<\/p>\n

\n

Want to learn more? Get in touch!<\/strong><\/p>\n

\n

Fredrik Lamberg<\/strong>
Sales Engineer
fredrik.lamberg@hydnet.se<\/a>
+46 70-316 40 81<\/p>\n","protected":false},"excerpt":{"rendered":"

In hydrostatic transmissions with closed-loop circuits, significant temperature increases and pressure spikes can occur when shock valves activate at high pressure. High Heat in Closed-Loop Transmission Systems For example, if a shock valve opens with oil at 50\u202f\u00b0C and a flow of 1\u202fl\/min, the temperature can rise by approximately 18\u202f\u00b0C at a 300-bar pressure differential. […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_breakdance_hide_in_design_set":false,"_breakdance_tags":"","footnotes":""},"categories":[19798,19799],"tags":[],"class_list":["post-73237","post","type-post","status-publish","format-standard","hentry","category-knowledge","category-news"],"acf":[],"yoast_head":"\nAvoid Unnecessary Heat in Closed-Loop Transmission Systems! - Hydnet\u2122 | Specialisten p\u00e5 intelligenta hydraulsystem<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/hydnet.se\/en\/avoid-unnecessary-heat-in-closed-loop-transmission-systems\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Avoid Unnecessary Heat in Closed-Loop Transmission Systems! - Hydnet\u2122 | Specialisten p\u00e5 intelligenta hydraulsystem\" \/>\n<meta property=\"og:description\" content=\"In hydrostatic transmissions with closed-loop circuits, significant temperature increases and pressure spikes can occur when shock valves activate at high pressure. 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