Pressure-relief direct-acting overflow valve

Abstract

The invention relates to the technical field of valves, and discloses a pressure-relief direct-acting overflow valve. The pressure-relief direct-acting overflow valve comprises a first shell; the topend of an inner cavity of the first shell is fixedly connected with a fixed block in a sleeving mode, and a pressure-adjusting screw is connected into the fixed block in a spirally-sleeved mode; and one end of the pressure-adjusting screw extends below the fixed block and is movably connected with a transmission block, and the bottom face of the transmission block is fixedly connected with a pressure-adjusting spring. Through mutual cooperation of an elastic piece, a sliding block, a guide rail, a linkage rod and a connecting plate, the connecting plate is utilized to drive the linkage rod tomove, the linkage rod drives the sliding block to move on the guide rail, the sliding block moves to compress the elastic piece to generate elastic force, the elastic force of the elastic piece drivesthe connecting plate to move to buffer the pressure of the pressure-adjusting screw, the problems that the pressure-adjusting screw is in a compressed state for a long time, the spring generates certain elastic deformation, consequently the elastic force of the spring is unstable, the overflow speed is influenced, consequently the overflowing effect is poor, and the stability is poor are avoided,and the overflowing stability is ensured while the overflowing effect is improved.

Description

technical field [0001] The invention relates to the technical field of valves, in particular to a pressure relief direct-acting overflow valve. Background technique [0002] The direct-acting relief valve is mainly composed of a valve body, a valve core, a pressure regulating spring and a pressure regulating screw. Under normal conditions, the valve core is tightly attached to the valve seat under the action of the pressure regulating spring. It is blocked, so the relief valve is normally closed. When the relief valve is connected to the system, the hydraulic oil will generate a force on the valve core. The direction of the force is opposite to the direction of the spring force. When the oil acts When it is greater than the spring force, the valve core opens, and the oil flows back to the tank from the overflow port. The spring force increases with the increase of the opening of the overflow valve until it is balanced with the hydraulic force. When the overflow valve starts ...

AI Technical Summary

Problems solved by technology

[0003] During the use of modern direct-acting relief valves, because the pressure regulating spring is in a compressed state for a long time, the spring has a certain elastic deformation, resulting in unstable elastic force of the spring, affecting the overflow progress, resulting in poor overflow effect and stable At the same time, because the pressure regulating screw is not protected, moisture and dust in the air enter the screw, causing the screw to be corroded and rusted by the moisture in the air, resulting in a short service life of the device and a waste of cost. In addition, because the valve is often Closed, when the internal components of the device are damaged, it is inconvenient to disassemble and repair. During the repair, a large amount of labor is required to consume workers, which affects the progress of the repair, resulting in difficult repairs and labor waste. A pressure relief direct-acting relief valve is now introduced.

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