Split-flow manifold valve is shunt valve, manifold valve and shunt manifold valve. The function of the diverter valve is to supply the same flow (equal flow diversion) to the two actuators from the same energy source in the hydraulic system so that the speeds of the two actuators can be synchronized or proportional. The purpose of the current collecting valve is to collect the equal flow rate or the amount of oil return from the two actuators so as to realize the speed synchronization or the proportional relation therebetween. Split-flow manifold valve both divert valve and collector valve function. Their graphical symbols are shown in Figure 1. Figure 2 is the same principle of shunt valve structure. Set the inlet oil pressure p0, flow q0, into the valve after the two-way respectively through two equal fixed orifice 1, respectively, into the oil chamber a, b, and then by the variable throttle 3,4 Via ports I and II to the two actuators. If the load acting on the two actuators is equal, the outlet pressure p3 = p4 at the outlet is symmetric, so the output flow is also symmetrical, q1 = q1 = q0 / 2 and p1 = p2. When p3 ≠p4 and p3> p4 appear due to asymmetric load, the spool will not be able to move in the middle for too long. Due to the same total resistance on the two runners, q1p2 must be ensured. At this point the valve spool left under the effect of asymmetric hydraulic pressure, so that the variable throttle 3 increases, throttle 4 decreases, so that q1 increases, q2 decreases until q1 ≈ q2, p1 ≈ p2 so far , The spool is stable in a new equilibrium position. That is, the flow to the two actuators is equal. When the two actuators are exactly the same size, the movement speed will be synchronized. At the time of shunting, since p0 is larger than p1 and p2, the spools 5 and 6 are in a phase-separated state and hook each other. If the load pressure p3> p4, if the spool still remain in the middle, it is necessary to make p2> p1. This is an integral spool will move left, variable throttle 3 decreases (see Figure 3b), so that p1 rise until p1 ≈ p2, the valve core to stop moving. Due to the equal area of ​​the two fixed throttles 1 and 2, the flow through the two fixed throttles, q1≈q2, is not affected by changes in the outlet pressures p3 and p4. Current conditions, due to p0 less than p1 and p2, so the two spool in a state of mutual pressure. Set the load pressure p4> p3, if the spool still remain in the middle position, it is necessary to make p2> p1. In this case, the spool pressed together becomes to the left and the variable throttle decreases (see Figure 3c), causing p2 to decrease until p2≈p1, and the spool stops moving. So q1 ≈ q2, but not by the import pressure p3 and p4 changes.
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