Pressure relief valve with automatic vent function on the hydraulic oil chamber

Abstract

The invention discloses a pressure relief valve with a function of automatic air exhaust on a hydraulic oil cavity. The pressure relief valve comprises a valve body (2) and a valve seat (4) installed at the bottom of the valve body (2), wherein the valve seat (4) is provided with a medium passage (5), a cavity (6) is formed in the valve body (2), a valve element (8) used for closing the medium passage (5) is arranged in the cavity (6), a valve element cover (10) is arranged at the top of the valve element (8), and an elastic assembly (12) for pressing the valve element cover (10) is arranged at the top of the valve element cover (10). The pressure relief valve is characterized by further comprising an air exhaust assembly (14) communicated with the medium passage (5). The pressure relief valve with the function of automatic air exhaust on the hydraulic oil cavity has the function of automatically discharging residual air, is simple in structure, and is convenient to popularize.

Description

technical field [0001] The invention relates to a pressure relief valve, in particular to a pressure relief valve with an automatic exhaust function on a hydraulic oil cavity. Background technique [0002] Metering pump is a special positive displacement pump whose flow rate can be adjusted steplessly within the range of 0-100% and used to transport liquids (especially corrosive liquids). With the continuous development of modern industrial automation, metering pumps are used more and more widely. However, it has been found in long-term use that the pressure relief valves used on the hydraulic oil chambers of most metering pumps are not equipped with drain valves on their valve core structures. The air structure, therefore, does not have the exhaust function. However, the hydraulic oil chamber of the metering pump will inevitably be mixed with air when it is shut down and disassembled in the cavity state, and the hydraulic oil is also prone to oil foam during the operation o...

AI Technical Summary

Problems solved by technology

With the continuous development of modern industrial automation, metering pumps are used more and more widely. However, it has been found in long-term use that the pressure relief valves used on the hydraulic oil chambers of most metering pumps are not equipped with drain valves on their valve core structures. The air structure, therefore, does not have the exhaust function. However, the hydraulic oil chamber of the metering pump will inevitably be mixed with air when it is shut down and disassembled in the cavity state, and the hydraulic oil is also prone to oil foam during the operation of the pump.

In the metering pump of the existing structure, no matter before operation or during operation, due to the forced return of the elastic component in the pressure relief valve to the valve core, the valve core closes the medium channel on the valve seat, so that the fluid mixed in the hydraulic oil chamber The air cannot be discharged when the internal and external pressure difference is small. The air remaining in the hydraulic oil chamber will not only affect the accuracy of the metering pump, but also seriously affect the stability of the metering pump. Moreover, during the operation of the pump In the middle, the hydraulic oil is also prone to oil foaming

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