Safety pilot electromagnetic valve

Abstract

The invention provides an electromagnetic valve. The electromagnetic valve comprises a first pilot valve and a second pilot valve, wherein the second pilot valve is provided with a safety valve waterinlet; when a medium enters the safety valve water inlet, a medium passage is cut off by the second pilot valve; and when no medium enters the safety valve water inlet, the medium passage is connectedor disconnected by the first pilot valve. The electromagnetic valve provided by the invention has an over-pressure self-protecting function and can cooperatively realize the automatic selection of different protecting schemes according to over-pressure grades. During normal work, namely the pressure of water is within a working pressure range, the connection and disconnection of a water pipelineare controlled by starting and stopping a power supply and opening and closing the first pilot valve, namely one common pilot valve, and the second pilot valve, namely the safety valve cannot play a role; and when the pressure of the water pipeline system suddenly exceeds a warning value, a pressure sensor automatically transmits a signal, a water pump is started at the moment, the medium enters the safety valve water inlet, the second pilot valve begins working, and the water pipeline is disconnected.

Description

technical field [0001] The invention belongs to the field of solenoid valve design, in particular to a safety pilot solenoid valve. Background technique [0002] The solenoid valves used in existing coffee machines, water dispensers, etc. generally use normally closed direct-acting solenoid valves, and the power-on time is short. If the power is on for a long time, there is a possibility of burning. And when the pressure difference is too large, the direct-acting solenoid valve may not close tightly, causing leakage. Contents of the invention [0003] An object of the present invention is to provide a solenoid valve, including a valve body, a water inlet and a water outlet, the solenoid valve also includes a first pilot valve and a second pilot valve; the second pilot valve is provided with a safety valve water inlet , when the water inlet of the safety valve enters the medium, the second pilot valve is caused to cut off the medium passage; when the water inlet of the saf...

AI Technical Summary

Problems solved by technology

[0002] The solenoid valves used in existing coffee machines, water dispensers, etc. generally use normally closed direct-acting solenoid valves, and the power-on time is short. If the power is on for a long time, there is a possibility of burning

And when the pressure difference is too large, the direct-acting solenoid valve may not be closed tightly, causing leakage

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