Sequence Control Combination Valve

Abstract

The invention relates to hydraulic control device and provides a sequence control combination valve for overcoming the defect that control systems of electromagnetic sequence control combination valves are large in number of elements and high in failure rate. The sequence control combination valve comprises a valve part. The valve part is provided with an oil inlet, an oil outlet, a return oil inlet and a return oil outlet. The sequence control combination valve is characterized in that the sequence control combination valve comprises a hydraulic control switching valve body; the oil inlet communicates with the oil outlet in the valve part; the hydraulic control switching valve body is connected between the return oil inlet and the return oil outlet; the hydraulic control end of the hydraulic control switching valve body communicates with the oil inlet. According to the sequence control combination valve, when pressure is applied to the oil inlet, the hydraulic control check valve body is closed through the pressure of the oil inlet; and when no pressure is applied to the oil inlet, the hydraulic control check valve body is in a connecting state, so that sequence control is achieved. Due to the fact that the sequence control combination valve is provided with a flow distributing and collecting valve body and a flow collecting and distributing valve body, even distributing of oil liquid passing through a right path can be ensured. In addition, no electric appliance is involved in a braking system, the number of elements of the system is small, and the reliability is high.

Description

technical field [0001] The invention relates to a hydraulic control element, more specifically, to a sequence control combination valve which requires the opening sequence of the oil circuit. Background technique [0002] At present, some air brake braking systems require that the oil return circuit is closed while the oil inlet circuit is connected during operation, and the oil return circuit is connected while the oil inlet circuit is closed, so as to realize the circulation of the brake oil. The conventional method is to install a solenoid valve at the same time as the oil inlet and return circuits, and control the on-off of the solenoid valve according to the start-up angle of the foot brake valve, so as to realize the on-off control of the inlet and outlet oil circuits of the air brake system. High, and there are many components in the entire control system, and the failure rate is high. Simultaneously, the brake oil inlet also cannot guarantee the even distribution of...

AI Technical Summary

Problems solved by technology

The conventional method is to install a solenoid valve at the same time as the oil inlet and return circuits, and control the on-off of the solenoid valve according to the start-up angle of the foot brake valve, so as to realize the on-off control of the oil inlet and return circuits of the air brake system. High, and there are many components in the entire control system, the failure rate is high

At the same time, the injection of brake oil cannot ensure that the brake oil is evenly distributed between the left and right brake calipers of the front axle or rear axle of the vehicle.

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