Safety complex function valve and two-way valve composed by same

Abstract

The invention relates to a safety complex function valve. A valve bush is arranged between the left valve cavity and the right valve cavity in the valve body; a valve core is arranged in the valve bush; the valve core and the valve bush form a conical seal fit; both ends of the valve core are respectively provided with a spring, an adjusting screw and an emergency push rod; both ends of the valvebody are respectively fixed with a left valve cap and a right valve cap through bolts; and the left valve cap and the right valve cap are respectively provided with a left cap nut and a right cap nut. The two-way valve comprises a valve body and a reversing valve body, wherein the structure of the reversing valve body is identical to that of the valve body rotated for 180 degrees. A sealing element is respectively arranged between the valve bush and the valve body, between the valve cap and the valve body, between the valve cap and the bolt, on both ends of the sealing nut, and between the valve body and the reversing valve body in the two-way valve. The invention not only can adjust the pressure in two directions, but also can communicate the cavities in forward and backward directions in an emergency; and thus, the invention has the advantages of high safety, favorable sealing effect, wide application range of flow, strong flexibility and simple structure.

Description

technical field [0001] The invention relates to a safety valve, in particular to a safety composite function valve and a two-way valve composed of it, which is particularly suitable for engineering machinery with rotary action, such as excavators, roadheaders, door cranes, truck cranes, marine cranes, Mechanical equipment products such as hydraulic winches. Background technique [0002] Existing construction machinery, such as excavators, roadheaders, gantry cranes, truck cranes, marine cranes, hydraulic winches, etc., need overload protection and impact protection for their left and right rotations during slewing work. The current solution is Design a valve plate, which is equipped with two safety valves to complete the above functional protection. The safety valve used in this method has a single function and only has the ability to operate in one direction. Only one safety valve of this type It is impossible to adjust the positive and negative two-way safety pressure. It...

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the defects and problems existing in the prior art, such as no emergency structure, inability to communicate with chambers in both positive and negative directions, poor sealing, narrow applicable flow range, poor flexibility, and complicated structure, and provide A safety composite function valve with an emergency structure, capable of communicating positive and negative chambers, good sealing performance, wide application flow range, strong flexibility, simple structure and a two-way valve composed of it

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