Balance valve

A technology of balancing valve and valve body, applied in the field of hydraulic balancing valve, can solve the problems such as the need to improve the operation safety and the low work efficiency, and achieve the effect of improving the work efficiency and controllability, being easy to control, and having a compact structure.

CN106050784AActive Publication Date: 2016-10-26宁波市博尔法液压有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2016-10-26

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Abstract

The invention relates to a balance valve. An improvement is conducted on the basis of an existing valve body, an existing main valve element, an existing check valve element and the like, and in other words, a displacement controller is installed on the valve body. The displacement controller comprises a valve rod and a third spring, wherein the valve rod and the third spring slide in a third passageway in the valve body. The valve rod is used in cooperation with a third control opening in the third passageway for dividing the third passageway into a valve rod front cavity and a valve rod rear cavity. The third spring abuts against the valve rod so that the valve rod can have the tendency of opening the third opening all the time. The valve rod rear cavity communicates with a main valve rear cavity. The valve rod front cavity communicates with a check valve front cavity. One end of the valve rod extends out of the valve body to serve as an operation end. During use, the reversing direction of the valve rod can be well controlled, and then the stroke during load rising can be conveniently controlled at any time; and when the balance valve is applied to an amplitude-variable oil cylinder, the get-on height of a lorry-mounted crane can be quite conveniently controlled, in other words, the height alignment of the lorry-mounted crane does not need to be confirmed, and therefore the work efficiency and controllability are greatly improved; and the displacement controller is installed in the valve body, the structure is compact, and the balance valve is convenient to control.
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Description

technical field

[0001] The invention relates to a hydraulic control valve, in particular to a hydraulic balance valve. Background technique

[0002] In the fields of construction machinery, lifting and transportation machinery, etc., in order to prevent the danger of overspeed when the load is lowered, a balance valve is usually used to control the lowering speed of the load. For example, "Hydraulic Balancing Valve" whose Chinese patent authorization announcement number is CN1170067C and "Combined Hydraulic Balancing Valve" whose Chinese patent authorization announcement number is CN20273256U all disclose the structure of the balancing valve.

[0003] At present, although the structure of the balance valve has been presented in various forms, during the load rising process, the pressure oil usually enters from the A port of the balance valve, and after the check valve is opened, it flows out from the B port. There is no other spool inside the balance valve to control the oi...

Examples

Embodiment Construction

[0019] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0020] Such as Figure 1 to Figure 3 As shown, the balance valve includes a valve body 1, a main valve core 2, a one-way valve core 3 and a displacement controller 4, wherein the displacement controller 4 includes a valve stem 41, and the valve body 1 is provided with a The core 2, the one-way valve core 3, the first channel 11, the second channel 12 and the third channel 13 where the valve stem 41 slides, in this embodiment, the first channel 11, the second channel 12, and the third channel 13 They are distributed horizontally and arranged at intervals from bottom to top. The main valve core 2 cooperates with the first control port 111 on the first passage 11 to separate the first passage 111 into a main valve front chamber 112 and a main valve rear chamber 113. The main valve core 2 is provided with a throttling groove 21 matched with the f...