Shuttle valve, hydraulic system and mechanical equipment

Abstract

The invention provides a shuttle valve. The shuttle valve comprises a valve bush and a valve element movably arranged in the valve bush. A first frustum is arranged at the first end of the valve element, a first conical base used in cooperation with the first frustum is arranged in the valve bush, and the first frustum and the first conical base are in conical surface contact. An opening A and an opening B are at least formed in the valve bush, when oil flows in the opening A, the first frustum at one end of the valve element and the first conical base are in surface contact, and conical surface seal is formed. According to the shuttle valve of the structure, one end or the two ends of the valve element are arranged to be of a frustum structure, cooperation between the valve element and the valve bush is changed into conical surface cooperation from point cooperation and linear cooperation, the sealing effect and the sealing performance of the shuttle valve are greatly improved, the sealing stability is better, it can be achieved that no leakage is generated during work, or the leakage amount is extremely small, and the requirement that the leakage speed is within 5 drops per Min is met. In addition, the invention provides a hydraulic system comprising the shuttle valve and mechanical equipment.

Description

technical field [0001] The invention relates to the field of hydraulic machinery, in particular to a shuttle valve, a hydraulic system and mechanical equipment. Background technique [0002] The shuttle valve is a product that combines the actuator and the valve body. The shuttle valve that is widely used at present, because the valve body, piston, and valve core are all made of stainless steel, it is more beautiful and high-grade in appearance, and the seal in actual use It has almost no contact with the medium and is more corrosion-resistant. In addition, there is only one part (piston) moving inside, which makes the movement simple and reliable, with long service life and easier maintenance. It can be installed in any direction. [0003] However, for shuttle valves whose leakage rate is required to be within 5 drops / Min and whose sealing performance is relatively stable, the structure commonly used in the market currently adopts a steel ball sealing structure. Due to the ...

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Problems solved by technology

[0003] However, for shuttle valves whose leakage rate is required to be within 5 drops / Min and whose sealing performance is relatively stable, the structure commonly used in the market currently adopts the steel ball sealing structure. Due to the use of round steel balls, the position of the sealing point of each steel ball will Changes will occur. In the field of frequent work or high pressure, the stability of the shuttle valve with this structure will be very poor, and there will often be problems with large leakage, and even cannot work normally.

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