Pure water unloading overflow valve

Abstract

The invention discloses a kind of pure water off-loading overflow valve consisting of a king pressure control valve and pure water electromagnet switching ball valve. The king pressure control valve consists of a king valve and a guide valve. The king valve plug having a secondary throttling cone valve structure with high pressure conduction is effective to restrain air muddy. The guide valve having cone valve structure with damping piston can increase motion damp and advance working stability of the overflow valve; constant pressure precision of the overflow valve is increased, if set constant liquid damp at the entrance of the guide valve. The electromagnet switching ball valve is generated by dry-type DC electromagnet, and is switched fast by mechanism of force amplification. The invention achieves zero leakage by sealing directly valve plug and valve cover, valve cover and valve body, improve static performance of the overflow valve by add valve port damper and achieve fast over-loading by electromagnets with larger thrust. The invention has characters of good versatility, integrated multifunction and being easy to standardize so as to fit to work under conditions of middle and high pressure water medium.

Description

technical field [0001] The invention relates to valves, in particular to a pure water unloading overflow valve. Background technique [0002] Due to its unique advantages of environmental protection and flame retardancy, pure water hydraulic technology is being widely valued by hydraulic circles all over the world, and pure water hydraulic components have also become one of the key research contents. The pure water unloading overflow valve is one of the most critical valve components in the hydraulic system, and the research on the unloading overflow valve suitable for the pure water hydraulic system has also become a research focus. [0003] The unloading of the hydraulic system means that when the actuators, such as oil cylinders, oil motors, etc. are not working, or when the full flow is not required, all or part of the oil output by the oil pump flows back to the mailbox under very low pressure, so that the oil pump is idling. state. Unloading the system can not only r...

AI Technical Summary

Problems solved by technology

In the pure water hydraulic system, due to the high density and low viscosity of water, the working stability of the pure water unloading overflow valve is more serious than that of the oil pressure unloading overflow valve. At the same time, under the same conditions, the pure water unloading overflow valve The leakage of the relief valve is dozens of times that of the oil pressure unloading relief valve, making the structure of the existing oil pressure unloading relief valve unsuitable for water media

[0004] In addition, due to the high vaporization pressure of water, water is easily vaporized and boiled, so under the same conditions, the degree of cavitation damage suffered by pure water unloading overflow valves is hundreds of times stronger than that of oil pressure unloading overflow valves; and Compared with mineral oil, the water medium is highly corrosive, and the corrosion damage makes the existing oil pressure unloading relief valve materials not suitable for water medium

Images