{"id":2594,"date":"2024-03-06T15:57:49","date_gmt":"2024-03-06T14:57:49","guid":{"rendered":"https:\/\/www.bf-hydraulik.com\/encyclopedia\/hydraulic-graetz-circuit\/"},"modified":"2026-04-15T10:52:21","modified_gmt":"2026-04-15T08:52:21","slug":"hydraulic-graetz-circuit","status":"publish","type":"encyclopedia","link":"https:\/\/www.bf-hydraulik.com\/en\/hydraulic-graetz-circuit\/","title":{"rendered":"Hydraulic Graetz Circuit"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"2594\" class=\"elementor elementor-2594 elementor-527\">\n\t\t\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-735b55f8 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"735b55f8\" data-element_type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-50 elementor-top-column elementor-element elementor-element-2820cb8b\" data-id=\"2820cb8b\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-9fb9997 elementor-widget elementor-widget-text-editor\" data-id=\"9fb9997\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<h1>Hydraulic Graetz Circuit<\/h1><p>In hydraulics, the Graetz circuit is a type of bridge circuit. It is a combination of various control and regulating elements. The Graetz circuit is used with double-acting linear or radial motors.   <\/p><h2>Properties of the Graetz Circuit<\/h2><p>The movement speed of hydraulic radial or linear motors depends on the applied volume flow in the hydraulic lines. As long as the movement speed is irrelevant, simple directional valves are sufficient to trigger the desired movement. However, if the speed needs to be controllable in both directions and remain identical in each direction after adjustment, the Graetz circuit is a cost-effective, simple, and reliable solution.  <\/p><h3>The Specific Advantages of a Graetz Circuit<\/h3><p>The Graetz circuit makes it possible to precisely synchronize both travel paths of a <a href=\"https:\/\/www.bf-hydraulik.com\/hydraulikzylinder-doppeltwirkend.html\">double-acting cylinder<\/a>. It can achieve the same for the rotational speed of hydraulic radial motors. It is a simple and self-monitoring circuit used to establish a constant speed in double-acting <a href=\"https:\/\/www.bf-hydraulik.com\/en\/hydraulic-motor\/\" target=\"_self\" title='Hydraulic motor: linear and radial movementsGenerally speaking, a motor is a device that converts power into motion. In hydraulics, such a device is called a \"hydraulic motor\" in accordance with&hellip;' class=\"encyclopedia\">hydraulic motor<\/a>s.  <\/p><p>This is particularly advantageous when the rotational or travel speeds need to be varied by means of a <a href=\"https:\/\/www.bf-hydraulik.com\/en\/throttle-valve\/\" target=\"_self\" title=\"Throttle ValveBy reducing the pipe cross-section, a throttle creates a local flow resistance that the flowing fluid must overcome. Before the constriction, the flowing medium builds up, so that the&hellip;\" class=\"encyclopedia\">throttle valve<\/a>.<\/p><h3>Design of the Graetz Circuit<\/h3><p>The Graetz circuit consists of the following components:<\/p><ul><li>4x <a href=\"https:\/\/www.bf-hydraulik.com\/en\/check-valve\/\" target=\"_self\" title=\"Check ValveA check valve allows the flow of the medium to pass through in only one direction. In most applications, the medium is a fluid, hydraulic fluid, or gas. In&hellip;\" class=\"encyclopedia\">check valve<\/a>s<\/li><li>1x <a href=\"https:\/\/www.bf-hydraulik.com\/en\/throttle-valve\/\" target=\"_self\" title=\"Throttle ValveBy reducing the pipe cross-section, a throttle creates a local flow resistance that the flowing fluid must overcome. Before the constriction, the flowing medium builds up, so that the&hellip;\" class=\"encyclopedia\">throttle valve<\/a><\/li><li>Shut-off valve<\/li><li>Directional valve<\/li><li>Additional back-pressure valve<\/li><\/ul><p>The <a href=\"https:\/\/www.bf-hydraulik.com\/en\/check-valve\/\" target=\"_self\" title=\"Check ValveA check valve allows the flow of the medium to pass through in only one direction. In most applications, the medium is a fluid, hydraulic fluid, or gas. In&hellip;\" class=\"encyclopedia\">check valve<\/a>s ensure that the volume flow only moves in one direction. The hydraulic medium is guided through the <a href=\"https:\/\/www.bf-hydraulik.com\/en\/check-valve\/\" target=\"_self\" title=\"Check ValveA check valve allows the flow of the medium to pass through in only one direction. In most applications, the medium is a fluid, hydraulic fluid, or gas. In&hellip;\" class=\"encyclopedia\">check valve<\/a>s and then through the centrally located <a href=\"https:\/\/www.bf-hydraulik.com\/en\/throttle-valve\/\" target=\"_self\" title=\"Throttle ValveBy reducing the pipe cross-section, a throttle creates a local flow resistance that the flowing fluid must overcome. Before the constriction, the flowing medium builds up, so that the&hellip;\" class=\"encyclopedia\">throttle valve<\/a>. From there, it flows onward to the motor. The pressurized side pushes the piston in the desired direction. The opposite side is depressurized, forcing the hydraulic medium located there back into the tank.     <\/p><p>When the directional valve is actuated, the flow direction is reversed. Readjustment of the <a href=\"https:\/\/www.bf-hydraulik.com\/en\/throttle-valve\/\" target=\"_self\" title=\"Throttle ValveBy reducing the pipe cross-section, a throttle creates a local flow resistance that the flowing fluid must overcome. Before the constriction, the flowing medium builds up, so that the&hellip;\" class=\"encyclopedia\">throttle valve<\/a> is not necessary. The speed of the extending cylinder remains exactly the same and corresponds to the speed during retraction.  <strong> <\/strong><\/p><h3>The Advantages of the Graetz Circuit<\/h3><p>The Graetz circuit offers the following advantages:<\/p><ul><li>Change of working direction without switching the <a href=\"https:\/\/www.bf-hydraulik.com\/en\/hydraulic-pump\/\" target=\"_self\" title=\"Hydraulic pump provides pressure and volume flowThe hydraulic pump is the core component of a hydraulic system. It ensures the circulation of the hydraulic fluid. In doing so, it generates&hellip;\" class=\"encyclopedia\">hydraulic pump<\/a><\/li><li>Cost-effective arrangement<\/li><li>Self-regulating properties<\/li><\/ul><p>In simple <a href=\"https:\/\/www.bf-hydraulik.com\/en\/hydraulic-system\/\" target=\"_self\" title=\"Hydraulic system: design &amp; applications explained simplyA hydraulic system is used to apply large forces in a targeted manner over a defined distance with minimal effort. The underlying hydraulic principle&hellip;\" class=\"encyclopedia\">hydraulic system<\/a>s, reversing a volume flow requires switching the <a href=\"https:\/\/www.bf-hydraulik.com\/en\/hydraulic-pump\/\" target=\"_self\" title=\"Hydraulic pump provides pressure and volume flowThe hydraulic pump is the core component of a hydraulic system. It ensures the circulation of the hydraulic fluid. In doing so, it generates&hellip;\" class=\"encyclopedia\">hydraulic pump<\/a>. To do this, the pump must be connected to a switching gearbox or the electric motor must run in reverse. The directional valve in the Graetz circuit avoids this. The volume flow is switched while the pump direction remains the same.   <\/p><p>Since both flow directions are controlled with the same <a href=\"https:\/\/www.bf-hydraulik.com\/en\/throttle-valve\/\" target=\"_self\" title=\"Throttle ValveBy reducing the pipe cross-section, a throttle creates a local flow resistance that the flowing fluid must overcome. Before the constriction, the flowing medium builds up, so that the&hellip;\" class=\"encyclopedia\">throttle valve<\/a>, the arrangement is very cost-effective, simple in design, and space-saving. Additional control or regulating components are not required. <\/p><h3>Areas of Application for the Graetz Circuit<\/h3><p>The Graetz circuit is useful where high precision is required alongside <a href=\"https:\/\/www.bf-hydraulik.com\/en\/hydraulic-power\/\" target=\"_self\" title=\"Hydraulic Power: Measurement and Determination Explained ClearlyHydraulic power is a physical value from which the load capacity of hydraulic systems can be determined. This metric is primarily required for the&hellip;\" class=\"encyclopedia\">hydraulic power<\/a>. Typical examples include the operation of hydraulic gate and lifting systems, heavy construction equipment, or precision presses. <\/p><p>Furthermore, mechanical converters can be attached to the <a href=\"https:\/\/www.bf-hydraulik.com\/en\/hydraulic-motor\/\" target=\"_self\" title='Hydraulic motor: linear and radial movementsGenerally speaking, a motor is a device that converts power into motion. In hydraulics, such a device is called a \"hydraulic motor\" in accordance with&hellip;' class=\"encyclopedia\">hydraulic motor<\/a>s on both sides. This makes it possible to operate a machine with double the performance using a single central power source. 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