Low-noise reversing valve

Abstract

The invention discloses a low-noise reversing valve. The low-noise reversing valve includes a main valve, a guide valve, a valve core hole, a valve core, and a positioning pin; the main valve includesa cylinder and a piston positioned in the cylinder; a plurality of connectors are arranged on the cylinder; the guide valve is connected to the connectors at two sides of the cylinder of the main valve through a hydraulic fluid pipe; an inlet pipe of the guide valve communicates with a pump; the valve core hole is formed in the valve body; the valve core is inserted into the valve core hole; a channel is formed in the valve core; a channel opening of the valve core is butt-jointed with a channel opening of the valve body; and the positioning pin can limit rotation of the valve core, and can fix the valve core after the valve core rotates to a preset position. The reversing valve is simple in structure, can effectively reduce the suction and exhaust differential pressure, can lower the reversing resistance, and can reduce noise; the main valve has a simple structure, and then the reversing valve is high in reliability and is less in leakage, and in this way, even if there is two unloading channels connected to different pumps respectively, elongation of the valve body in the axial direction of the valve core can be suppressed.

Description

technical field [0001] The invention belongs to the technical field of reversing valve equipment, and in particular relates to a low-noise reversing valve. Background technique [0002] The reversing valve is a directional control valve with more than two flow forms and more than two oil ports. The piston valve core structure of the piston type reversing valve in the prior art is relatively complex, with a central hole in the center of the piston valve core, and a movable ball or plunger structure in the center hole to realize the left and right movement of the piston. Due to the influence of the suction and exhaust pressure difference, the piston of the reversing valve will be pressed on the cylinder of the reversing valve. When the piston moves, a large friction force will be generated between the piston and the cylinder. This friction Under certain conditions, the force will cause seizure between the valve cylinder and the piston. In addition, in the conventional switch...

AI Technical Summary

Problems solved by technology

Moreover, in the prior art, the unloading passages of the reversing valve are connected to different pumps respectively. In this case, if the unloading passages of the reversing valve are not properly configured, the valve body of the reversing valve may be enlarged.

At the same time, when switching, due to the large pressure difference between suction and exhaust, and during the switching process, the branch pipe will bypass, and the huge airflow sound will generate a lot of noise