Hydraulic unloading shuttle valve

Abstract

The invention provides a hydraulic unloading shuttle valve, mainly solves technical problems of guaranteeing the tightness of a lift valve and the flexibility and convenience of the opening and closing of the lift valve, and adopts a technical scheme that: the shuttle valve is arranged on a lift valve body; a valve core, a left crown bar and a right crown bar are arranged in a shuttle valve body;a left hole and a right hole are reserved at ends of the left crown bar and the right crown bar; a left through hole, a middle hole and a right through hole are reserved on the shuttle valve body; the left through hole is communicated with a high-pressure cavity of the lift valve body; the right through hole is communicated with a low-pressure cavity of the lift valve body; and the middle hole iscommunicated with a sealed annular cavity. When the valve core of the shuttle valve moves rightwards, the high-pressure cavity and the annular cavity are communicated; and when the shuttle valve moves leftwards, the low-pressure cavity and the annular cavity are communicated. The hydraulic unloading shuttle valve is suitable for various lift valves.

Description

Technical field: [0001] The invention relates to a poppet valve, in particular to a poppet valve assembly. Background technique: [0002] Pressure-filled and sealed cut-off valves, such as butterfly valves, can effectively seal the flow channel, and their structure is simple and easy to operate. They are widely used in industry, transportation, petroleum and other related departments. The frictional force is relatively large, resulting in a large opening and closing torque, which is usually only suitable for working conditions with low working pressure; in view of this, the industry has researched and developed a variety of related technical solutions, such as Chinese patent CN2319634 discloses a differential fast opening and closing The butterfly valve consists of a valve body, a connecting rod mechanism installed in the valve body, a valve seat and a valve plate. There is a pressure relief device between the connecting rod and the valve plate. The device includes a valve c...

AI Technical Summary

Problems solved by technology

[0002] Pressure-filled and sealed cut-off valves, such as butterfly valves, can effectively seal the flow channel, and their structure is simple and easy to operate. They are widely used in industry, transportation, petroleum and other related departments. The frictional force is relatively large, resulting in a large opening and closing torque, which is usually only suitable for working conditions with low working pressure; in view of this, the industry has researched and developed a variety of related technical solutions, such as Chinese patent CN2319634 discloses a differential fast opening and closing The butterfly valve consists of a valve body, a connecting rod mechanism installed in the valve body, a valve seat and a valve plate. There is a pressure relief device between the connecting rod and the valve plate. The device includes a valve core, a butterfly spring and a sealing ring. , the connecting rod is connected with the valve core, and there is a through hole in the center of the valve core that can communicate with the left and right chambers of the valve plate, but its function is only to keep it open and light, so its applicable fluid working pressure can only slightly increase the effect; the latest Chinese patent CN2874170 provides an inflatable sealed butterfly valve. There is an air-filled hole perpendicular to the simplified axis at the junction of the valve body and the sealing ring. The air-filled hole is connected to a pressure source. Press the valve plate to achieve effective sealing, release the pressure when the valve is opened, and create a gap between the sealing ring and the valve plate, thereby eliminating the friction between the valve plate and the sealing ring, and realizing the function of easy opening and closing of the poppet valve. The source will greatly complicate the overall structure of the valve, and the scope of application will be greatly limited; US Pat. Moving between the two set positions, it can regularly change the position of the valve through friction, control the flow of the medium, and then control its fluid pressure, thus improving the working performance of the poppet valve. Although this technical solution cannot reduce the The friction force of the sealing pair contributes to the technology of easy opening and closing of the valve, but the use of shuttle valves on the poppet valve, which has the characteristics of compact structure and flexible movement, is a better technical reference solution to solve the problem of easy opening and closing of the poppet valve

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