Created on:2022-03-30 13:17

Key points of use of diverter collector valve

Key points of use of diverter collector valve

1. Application occasions of shunt and collecting valve

Shunt and collecting valve is mainly used for speed synchronization or control of 2 ~ 4 actuators in hydraulic system

(1)       Double cylinder synchronous circuit of diverter valve and one-way diverter valve. In the circuit shown in Fig. 113 (a), the diverter valve 2 divides the hydraulic oil from the hydraulic source through the left position of the three position four-way directional valve 1 into two equal routes and sends them to the two hydraulic cylinders 3 respectively to realize the one-way synchronous movement of the two cylinders. In the circuit shown in Fig. 113 (b), when the hydraulic cylinder extends, the one-way diverter valve 4 divides the hydraulic oil from the hydraulic source through the left position of the three position four-way directional valve 1 into two equal routes, which are sent to the rodless cavities of the two hydraulic cylinders 3 respectively, and the two cylinders move synchronously; When the hydraulic cylinder retracts in the reverse direction, the pressure oil of the hydraulic source enters the rod cavity of the hydraulic cylinder through the right position of valve 1, and the non rod cavity returns the oil through the one-way valve of valve 4.

(2)       Double cylinder synchronous circuit of collecting valve and one-way collecting valve. In the circuit shown in Fig. 114 (a), when the change-over valve 1 is switched to the right position, the collecting valve 2 combines the oil and liquid in the rodless cavity of the two hydraulic cylinders 3 into one, so as to realize the one-way synchronous movement of the two cylinders. In the circuit shown in Fig. 114 (b), when the hydraulic cylinder retracts, the one-way collecting valve 4 combines the oil from the rodless cavity of the two hydraulic cylinders 3 into one, so as to realize the synchronous descending movement of the two cylinders; When the hydraulic cylinder extends reversely, the pressure oil of the hydraulic source enters the rod free cavity of the two hydraulic cylinders through the left position of the directional valve 1 and the two check valves of the valve 4, and the rod cavity returns oil through the valve 1.

112.113.114

(3)       Double cylinder synchronous circuit. Fig. 115 shows the two cylinder synchronous circuit of the diverter and collector valve. The two-way synchronous movement of hydraulic cylinders 8 and 7 can be realized through the diverter and collector valve 3 with equal input flow. When the three position four-way solenoid directional valve 1 is switched to the left position, the pressure oil from the hydraulic source enters the rodless cavities of hydraulic cylinders 6 and 7 respectively through valve 1, one-way valve in one-way throttle valve 2, shunt and collecting valve 3 (used as shunt valve at this time), and hydraulic control check valves 4 and 5, so as to realize the synchronous extension movement of double cylinders; When the three position four-way solenoid directional valve 1 is switched to the on position, the pressure oil of the hydraulic source enters the rod cavity of the hydraulic cylinder through valve 1, and the hydraulic control check valves 4 and 5 are connected in the opposite direction. The rod free cavity of the double cylinder returns oil through valves 4 and 5, shunt collecting valve 3 (used as a collecting valve at this time) and directional valve 1 to realize the retraction and synchronous movement of the double cylinder.

(4)       Three cylinder synchronous circuit of shunt and collecting valve. Fig. 116 shows the three cylinder synchronous circuit of the shunt and collecting valve. The three hydraulic cylinders 4, 5 and 6 are distributed with equal flow through two shunt and collecting valves 2 and 3 with shunt ratio of 2:1 and 1:1 to realize the synchronous movement of the three cylinders. The same method can also be used to form a four cylinder synchronous circuit with shunt and collecting valve.

115.116

2. Precautions for use

(1) As the passing flow has a great impact on the synchronization accuracy and pressure loss of the shunt and collecting valve, the flow specification of the shunt and collecting valve should be correctly selected according to the requirements of synchronization accuracy and pressure loss.

(2) When the actuator needs to stop during the stroke, in order to prevent oil channeling due to unequal load pressures at the two outlets, a hydraulic control check valve should be set in the synchronous circuit (see Figure 115).

(3) It is difficult to achieve position synchronization when the diverter and collector valve is dynamic. Therefore, it is not suitable to use the diverter collector valve in the system with frequent load change or frequent commutation.

(4) In order to avoid synchronization error caused by different leakage and other reasons, try not to connect other control elements between the shunt collecting valve and the signal light-emitting element.

(5) Ensure that the axis of the valve core of the shunt and collecting valve is installed horizontally, so as not to cause the valve core to sag and affect the synchronization accuracy.

(6) Since the left and right parts of the diverter collecting valve are usually assembled in an optional way, in order to ensure the synchronization accuracy, after fault cleaning and maintenance, all parts shall be installed according to the original position and direction.

 

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