2 GC and D Series Rotary Gear Flow Dividers Intensifier - Combiner (European and U.S. Versions) Field-proven Concentric Hydraulic Systems’ Rotary Gear Flow Dividers are providing efficient, reliable service for a wide variety of applications in agricultural, materials handling, and construction equipment. These hydraulic flow dividers provide many useful functions from a single pump source: • Synchronized operation of multiple cylinders or fluid motors. • Proportional division of pump output among several circuits. • Intensified pressure when pressure higher than pump capacity is needed. WHY ROTARY GEAR FLOW DIVIDERS INSTEAD OF SPOOL TYPE DIVIDERS? Connected within the hydraulic circuit, rotary gear flow dividers operate automatically and only when needed. They require no maintenance. In a rotary gear divider, horsepower-in is equal to horsepower-out with very small efficiency losses. Consequently, it does not generate heat. Since the efficiency of the unit is a function of the pressure drop across the section, efficiencies approaching 98 percent are not uncommon. This enhances the overall system effectiveness. Spool type dividers require a significant pressure drop just to operate. Heat is designed in when spool type dividers are incorporated in an application. Much care has to be taken to accommodate the inherent inefficiencies of spool type dividers when sizing them for an application. Rotary gear flow dividers are also more tolerant of contamination and more rugged than spool type flow dividers. Spool type dividers can be accurate and exhibit little internal leakage but their cost is generally as much as 25% greater than comparable rotary gear dividers. DIFFERENTIAL RELIEF VALVES Our modular design allows us to add differential relief valves in each section of our flow dividers. These valves are not system relief valves. They are commonly used in applications where cylinders must be synchronized. They also serve to protect the flow divider against excessive differential pressure in the divider which could be caused by actuators becoming stalled or restricted. APPLICATION OF A ROTARY GEAR FLOW DIVIDER IN A CYLINDER CIRCUIT Rotary Gear Flow Dividers are designed to synchronize hydraulic cylinders (bring them to equal stroke length) in one direction only. This needs to be in a direction where the cylinders bottom out (go to the end of their stroke). The synchronizing is accomplished because excess fluid is bled off over the flow divider’s internal relief valves to feed the cylinder that is late getting to the end of it’s stroke. Reversing the direction of the cylinders, the Rotary Gear Flow Divider will act as a combiner with the same efficiency as a divider. Please note that a combiner doesn’t regulate cylinder speed, so a flow control is required to limit maximum flow. ROTARY GEAR FLOW DIVIDER USED AS AN INTENSIFIER Press and clamping circuits that require high flow at low pressure and low flow at high pressure are good applications for Rotary Gear Flow Dividers to intensify pressure. High flow from the outputs of the divider are combined until high pressure is required, then one or more of the divider outputs are dumped to tank giving high pressure in the intensified circuit. Caution is required so that the pressure does not exceed the rating of the flow divider. WHAT’S NEW AND INNOVATIVE ABOUT CONCENTRIC ROTARY GEAR FLOW DIVIDERS? We have earned a reputation over the last 80 years as innovators and systems specialists. We go beyond the basic requirements for hydraulic components to analyze the total system goals. In doing this, many times we find that we can help solve a customer’s system problem by doing something different to our product. The following are examples of how we have done this with flow dividers: SOLENOID ACTUATED 2-WAY VALVES FOR FLUID MOTOR DRIVE APPLICATIONS This feature provides operator selection between a positive traction drive or differential drive on turf care vehicles, small utility vehicles and various mobile lift devices. This feature is available in 2, 3 or 4 section dividers. ADJUSTABLE NEEDLE VALVE BETWEEN SECTIONS to allow only the set amount of flow providing the desired differential effect for drive motors. It can also be adjusted for varying tire ratios. WHY CONCENTRIC VS. OTHER ROTARY GEAR FLOW DIVIDERS? Concentric GC series flow dividers are of cast iron construction with 1/2” diameter shaft and needle bearings for high pressure operation. The gear bores are held to extremely close tolerances to provide maximum efficiency. They are lighter weight than many competitors because no interface plates are required between sections. This feature also insures better shaft alignment and fewer leakage paths. Seal plates between each section provide additional insurance against leakage. The modular design easily accommodates multiple gear width combinations and multiple porting options. Concentric D series flow dividers incorporate the above features but substitute a 5/8” diameter shaft and needle bearings. The D series also substitutes o-ring seals between each section for enhanced sealing. INSIDE THIS CATALOG ... This catalog combines both GC and D series flow divider information, including European versions. We have included performance and dimensional information as well. Please review the information provided to get a general understanding of what Concentric can offer your company. To answer your specific needs, please contact us. We have an excellent track record for meeting unique hydraulic system challenges. Pictures on front cover are used with the kind permission of eg: Atlet, BT, Huddig, Scania, Toro and Volvo Construction Equipment. quality products for mechanical & fluid power ~ jbj Techniques Limited, www.jbj.co.uk UK distributor for Concentric Hydraulics
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