Hand-driven change valve

Abstract

The invention relates to a manual directional valve, which comprises a valve body, a front and a back covers, a valve plug assembly and a handle, wherein the front cover and the back cover are arranged on the front side and the back side of the valve body, the valve plug assembly is arranged in the inner portion of the valve body, the handle drives a valve plug in the valve plug assembly, and the handle is arranged on the outer portion of the front cover and is connected with the valve plug in the valve plug assembly through a link gear which is arranged in the front cover. The link gear comprises a push rod which is connected with a pin in the valve plug assembly, the push rod is vertically crossly connected with a handle shaft, and the handle is connected with one end of one side of the handle shaft, which is extended from the front cover. Because the handle is arranged outside the front cover by the manual directional valve, dust does not enter into the front cover, a prior rubber cup is capable of being cancelled, and the production and installment cost are reduced. When the rubber cup is cancelled, the reversing resistance of the handle is capable of being reduced, and the reduction effect is excellent. The manual directional valve of the invention has high flexibility and strong generality, and is capable of being suitable for wicked working environment. The pins which are arranged on the two ends of the valve plug have a same diameter, and pressure oil is not escaped through a seal ring which is arranged between the pin and a blind nut.

Description

technical field [0001] The invention relates to the technical field of hydraulic control, in particular to a hydraulic manual reversing valve. Background technique [0002] Manual reversing valves are often used in hydraulic control systems to manually control the flow direction of hydraulic oil. Manual reversing valve in the prior art such as figure 1 As shown, it generally includes a valve body 1', a control spool 3' inside the valve body 1', a return spring at both ends of the control spool 3', and a handle 2' that controls the movement of the spool 3'. Handle 2' is arranged on front cover top central part, and rubber cup 21' is equipped with on the bottom of handle 2' to block dust. However, during use, the leather cup 21' is easy to disengage, and it is easy to age in the sun and rain in the open air, thereby affecting the dustproof effect; in addition. Installing the leather cup 21' increases the reversing resistance of the handle at the same time. When the back pre...

AI Technical Summary

Problems solved by technology

However, during use, the leather cup 21' is easy to disengage, and it is easy to age in the open sun and rain, thereby affecting the dustproof effect; in addition

Installing the leather cup 21' increases the reversing resistance of the handle at the same time. When the back pressure increases and the resistance of the sealing ring also increases, for the manual reversing valve with spring return, there will be a phenomenon of uncomfortable reset, which will affect the normal operation of the hydraulic system.

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