Flow divider-combiner assembly

• B, B/S

  Port AB: 1 1/4" NPTF; Ports 1A,1B,2A,2B: 3/4" NPTF; Mtg Holes: .375 - 16UNC x .75 DP;
• J, J/S

  Port AB: SAE 20; Ports 1A,1B,2A,2B: SAE 12; Mtg Holes: .375 - 16UNC x .75 DP;
• U, U/S

  Port AB: 1 1/4" BSPP; Ports 1A,1B,2A,2B: 3/4" BSPP; Mtg Holes: M10 x 1.5-6H x .75 DP;

This valve assembly uses 3 divider/combiner valves to provide 4 equal bidirectional flows. In the dividing mode, flow coming into AB is divided into 4 equal flows, A1, A2, B1, B2. In the combining mode the assembly throttles the 4 flows coming into A1, A2, B1, B2 keeping them equal.

• Operating characteristics cause the leg of the circuit with the greatest load to receive the higher percentage of flow in dividing mode. If a rigid mechanism is used to tie actuators together, the lead actuator may pull the lagging actuator and cause it to cavitate.
• In combining mode, compensating characteristics will cause the leg of the circuit with the lowest load to receive the higher percentage of flow. If a synchronization feature is not included, an additive accuracy error will be experienced with each full stroke of the actuator.
• In applications involving rigid mechanisms between multiple actuators, operating inaccuracy will cause the eventual lock-up of the system. If the mechanical structure does not allow for the operating inaccuracy inherent in the valve, damage may occur.
• In motor circuits, rigid frames or mechanisms that tie motors together, and/or complete mechanical synchronized motion of the output shaft of the motors, either by wheels to the pavement or sprockets to conveyors, will contribute to cavitation, lock-up and/or pressure intensification.
• Variations in speed and lock-up can be attributed to differences in motor displacement, motor leakage, wheel diameter variance and friction of wheels on the driving surface.
• Extreme pressure intensification can occur on multiple wheel drive vehicles.
• Flow between ports is limited to spool leakage. This does not provide leak proof holding capability, but can be useful in minimizing cross flow and drift.
• Differential slip for tractive drive systems must be achieved with orifices in the body/manifold.
• Divisional and combining accuracy are equal.
• Below the minimum flow rating there is not enough flow for the valve to modulate. It is effectively a tee. If flow starts at zero and rises, there will be no dividing or combining control until the flow reaches the minimum rating.

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