Tractive flow divider-combiner assembly


Function for YGDB
Port Designators [ + ]
Modifiers Ports
B, B/S Ports 2, 3, 4: 3/8" NPTF; Gage Ports (Plugged): SAE 4;
C, C/S Ports 2, 3, 4: 1/2" NPTF; Gage Ports (Plugged): SAE 4;
D, D/S Ports 2, 3, 4: 3/4" NPTF; Gage Ports (Plugged): SAE 4;
J, J/S Ports 2, 3, 4: SAE 8; Gage Ports (Plugged): SAE 4;
K, K/S Ports 2, 3, 4: SAE 10; Gage Ports (Plugged): SAE 4;
L, L/S Ports 2, 3, 4: SAE 12; Gage Ports (Plugged): SAE 4;
U, U/S Ports 2, 3, 4: 3/8" BSPP; Gage Ports (Plugged): SAE 4;
V, V/S Ports 2, 3, 4: 1/2" BSPP; Gage Ports (Plugged): SAE 4;
W, W/S Ports 2, 3, 4: 3/4" BSPP; Gage Ports (Plugged): SAE 4;
Technical Features [ + ]

This valve assembly is intended for use in tractive systems. It incorporates a divider/combiner valve along with provisions for slip orifices. The divider/combiner provides 2 equal flows for positive traction and the slip orifices can be sized to allow for steering.

  • 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.
  • Differential slip for tractive drive systems must be achieved with orifices in the body/manifold.
  • 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.
Technical Data [ + ]
Body Type Line mountLine mount
Capacity 4 - 17 gpm15 - 65 L/min.
Mounting Hole Diameter .34 in.8.6 mm
Mounting Hole Depth ThroughThrough
Mounting Hole Quantity 22
FAQs [ + ]

There are exactly 250 Sun drops in a cubic inch or 15 in a cc.

Direct-acting valves are used to prevent over pressure, and pilot-operated valves are used to regulate pressure. If you are unsure, use a direct-acting valve. Sun's direct acting valves are very fast, dirt tolerant, stable, and robust. Sun's pilot-operated valves are moderately fast, they have a low pressure rise vs. flow curve, and they are easy to adjust.

Notes [ + ]
  • Important: Carefully consider the maximum system pressure. The pressure rating of the manifold is dependent on the manifold material, with the port type/size a secondary consideration. Manifolds constructed of aluminum are not rated for pressures higher than 3000 psi (210 bar), regardless of the port type/size specified.
  • For detailed information regarding the cartridges contained in this assembly, click on the models codes shown in the Included Components tab.
Additional Resources [ + ]