Anti-siphon backflow guide-type electromagnetic valve

Abstract

The invention discloses an anti-siphon backflow guide-type electromagnetic valve which comprises a main valve, an electromagnetic valve and a one-way valve; the main valve comprises a main valve body, a main valve core, a main valve cover and a valve rod; the main valve core is internally provided with a main valve base; a diaphragm component is arranged between the main valve base and the main valve cover; the diaphragm component divides a cavity in the main valve body into an upper cavity and a lower cavity; a main valve resetting spring is supported between the diaphragm component and the main valve cover; the main valve core is installed between the diaphragm component and the main valve base, and the main valve core is connected with the diaphragm component; the side wall of the upper cavity is provided with a through hole; the through hole is communicated with a guide cavity of the electromagnetic valve; the lower end of the electromagnetic valve is provided with a flow channel communicated with the lower cavity; the one-way valve comprises a valve body, a valve core and a valve base; the inlet of the valve body is communicated with the lower cavity; the valve body is provided with a gas channel which is communicated with the inner cavity of the valve body; and the valve core is supported by the resetting spring. When a main water delivery pipeline can not supply water normally, the guide-type electromagnetic valve can prevent the siphon backflow phenomenon.

Description

technical field [0001] The invention relates to the field of fluid control valves, in particular to an anti-siphon backflow pilot solenoid valve. Background technique [0002] In foreign large-scale farms, due to the large area and wide range, a lot of manpower is required for watering, fertilizing, and spraying pesticides. Even in developed countries, although water pipes are distributed, the switching of control valves still needs to be done manually. In order to achieve automation and to maintain the consistency of crop growth, there is a pilot solenoid valve that can remotely control the valve switch. The purpose of closing the valve is to make the crops get the same growth conditions. This kind of valve can also be widely used in fire protection, sprinkler water supply system, and also suitable for pneumatic, hydraulic and automatic control system of food processing machinery. [0003] The working principle of the pilot solenoid valve is to control the up and down mov...

AI Technical Summary

Problems solved by technology

However, the current pilot solenoid valve still has shortcomings, that is, when the pressure before the valve is lower than the pressure behind the valve and the main valve cannot be closed, at this time, the phenom

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