4 The curve on the left and the chart above can be useful in selecting the proper size flow divider sections. The curve shows speed vs. flow per section. For equal sized sections: Assume two section dividers with a total flow of 16 GPM (60.6 L/M) in and 8 GPM (30.3 L/M) per section out. From the chart, an order code 16, 20, 24 or 28 would be suitable for this flow. However, the nearer the mid-range, the better the efficiency. From the curve, order code 20 crosses the 8 GPM (30.3 L/M) line at 3200 RPM. The best selection is the order code 20 gear section. For proportional flow, the curve is used as follows: Assume a three section divider with an input flow of 20 GPM (75.7 L/M) and an outlet flow of 10 GPM (37.9 L/M), 7 GPM (26.5 L/M), and 3 GPM (11.4 L/M). With a straight edge on the RPM line, note the 10 GPM (37.9 L/M) line at 2800 RPM gives the proper flow with an order code 28 gear section, an order code 20 gear section and an order code 08 gear section. The chart above also shows the allowable differential pressures. The differential relief valve setting is determined by the maximum pressure needed by the circuit minus the inlet pressure without exceeding the allowable differential pressure. Either the continuous or intermittent differential pressures are used, depending on the circuit requirement. The differential relief valve is adjustable through a range of 500 - 1000 PSI (34.5 - 69 BAR). Our standard setting for the differential relief valves is 750 PSI (51.7 BAR). D Series Rotary Gear Flow Dividers Continuous Differential Between Sections PSI BAR 3000 207 2750 190 2500 172 2000 138 1500 103 1200 83 Intermittent Differential Between Sections PSI BAR 3000 207 3000 207 3000 207 2750 190 2250 155 1750 121 NOTE: Flows listed above are per section. * Stock units available in two and four section versions, see page 9. MAXIMUM inlet pressure 3000 psi (207 bar) • MAXIMUM outlet pressure 4500 psi (310.3 bar). For 3 section flow dividers or flow dividers with unequal sections, contact the factory. Recommended operating range 2000 rpm to 4000 rpm. NOTE: Do not exceed 4500 rpm. * * * Order Code 08 12 16 20 24 28 Minimum Maximum Flow/Sec Flow/Sec GPM L/M GPM L/M 2 7.6 4 15.2 3 11.4 6 22.9 4 15.2 8 30.5 5 19.0 10 38.1 6 22.9 12 45.7 7 26.7 14 53.3 SAE Ports Inlet Outlet 7/8-14 9/16-18 1 5/16-12 3/4-16 1 5/16-12 3/4-16 1 5/16-12 7/8-14 1 5/16-12 7/8-14 1 5/16-12 1 1/16-12 Displacement In.3 Cm.3 .232 3.81 .349 5.71 .465 7.62 .581 9.52 .697 11.43 .813 13.33 Gear Face Width 1/4 3/8 1/2 5/8 3/4 7/8 Performance 13.33 cc (.813 in. 3 ) 11.43 cc (.697 in. 3 ) 9.52 cc (.581 in. 3 ) 7.62 cc (.465 in. 3 ) 5.71 cc (.349 in. 3 ) 3.81 cc (.232 in. 3 ) quality products for mechanical & fluid power ~ jbj Techniques Limited, www.jbj.co.uk UK distributor for Concentric Hydraulics
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