Pilot type pure water overflow valve

Abstract

The invention discloses a kind of pure water overflow valve. In the king valve there is a king valve cover inside which there is a king valve core held down by a spring; on the bottom of the king valve body there is water inlet and outlet connected by the king valve's channel; The king valve plug having a secondary throttling cone valve structure with high pressure conduction reduce noise and abate vibration, and the constant liquid damp installed in the king valve core confirm the working stability of the overflow valve; the guide valve having cone valve structure with damping piston don't only increase motion damp to advance the working stability of the overflow valve, but also make the guide valve core conduct so as to confirm that it don't bank after being opened; constant liquid damp is set at the entrance of the guide valve so as to increase constant pressure precision of the overflow valve. The invention achieves zero leakage by sealing directly valve plug and valve cover, valve cover and valve body, and improve static performance of the overflow valve by add valve port damper; the valve is versatile.

Description

technical field [0001] The invention relates to hydraulic components characterized by hydraulic control technology, in particular to a pilot-operated pure water 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 overflow valve is one of the most critical valve components in the hydraulic system, and the research on the overflow valve suitable for the pure water hydraulic system has also become a research focus. [0003] There are two types of traditional hydraulic relief valves: one is a direct-acting relief valve consisting of a valve body, a conical or spherical spool and a pressure regulating spring, also known as a direct-acting relief valve. The control accuracy is low, and it is often used as a pilot valve; the ...

AI Technical Summary

Problems solved by technology

At present, the structure of the pure water relief valve developed in the world mainly follows the traditional oil pressure relief valve structure. It has only one fixed liquid resistance in the pilot circuit, and a variable liquid resistance is formed between the cone valve core and the valve seat. When the overflow increases, the opening of the pilot valve and the main valve will increase, the flow will increase, and the inlet pressure will increase, so there is a large positive steady-state pressure regulation deviation

Moreover, its anti-cavitation ability is poor, the requirements for processing technology are high, and the processing cost is high

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