Low-pressure large-flow direct-acting overflow valve

Abstract

The low-pressure large-flow direct-acting overflow valve comprises a valve body, a valve element and a flow adapter ring are arranged in the valve body, an inner hole cavity is formed in one end of the valve element, a parabola structural body is arranged at the other end of the valve element, and the flow adapter ring is fixed in the valve body and corresponds to the parabola structural body; an elastic piece is arranged in the inner hole cavity and connected with a fixed pre-tightening mechanism arranged on the valve body. According to the valve element, through the design of the parabola structural body, the pressure overshoot phenomenon caused by flow impact in the opening process of the overflow valve is reduced, it is guaranteed that after the valve element is opened, the flow has the quick-opening characteristic, and liquid is quickly discharged; meanwhile, when the overflow valve is fully opened, the valve element always keeps stable vibration without radial movement under large-flow impact, vibration is relieved when the valve element impacts a valve port, and the reliability of the overflow valve is guaranteed. By additionally arranging the specially designed flow adapter ring, the hydraulic cavitation phenomenon is eliminated, and the impact of fluid on the valve element in the working process is effectively reduced.

Description

technical field [0001] The invention relates to the technical field of overflow valves, in particular to a low-pressure, high-flow direct-acting overflow valve. Background technique [0002] The relief valve is a hydraulic pressure control valve, which mainly plays the role of constant pressure relief, pressure stabilization, system unloading and safety protection in hydraulic equipment. At present, domestic and foreign direct-acting relief valves cannot meet the pressure regulation range of 4-12 Bar under the condition of large flow rate of 150L / min-450L / min, and cannot be adjusted to 0.4 under the condition of large flow rate of 150L / min-450L / min. Bar low pressure. In addition, domestically produced direct-acting relief valves cannot meet the needs of low-pressure and high-flow systems. During the opening process of the valve, the oil flows in high-speed jets, and the flow velocity and direction of the fluid microspheres change sharply. The throttling part is very easy t...

AI Technical Summary

Problems solved by technology

At present, domestic and foreign direct-acting relief valves cannot meet the pressure regulation range of 4-12 Bar under the condition of large flow rate of 150L / min-450L / min, and cannot be adjusted to 0.4 under the condition of large flow rate of 150L / min-450L / min. Bar low pressure

In addition, domestically produced direct-acting relief valves cannot meet the needs of low-pressure and high-flow systems. During the opening process of the valve, the oil flows in high-speed jets, and the flow velocity and direction of the fluid microspheres change sharply. The throttling part is very easy to induce cavitation, vortex, pulsation and other exciting flow states, resulting in pressure fluctuations and oscillations of components in the valve, thereby further intensifying pressure fluctuations and reducing the working performance of the valve

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