Backflow preventing device for solenoid valve

Abstract

Disclosed is a backflow preventing device for a solenoid valve. The solenoid valve includes a solenoid valve including a body having an inlet port, an outlet port, and a valve seat interposed between the inlet port and the outlet port, and an opening part mounted on the body and having a plunger moved by an electromagnet and a spring. The backflow preventing device includes a closure of rubber mounted between the inlet port and the outlet port, and having a fluid supply line which is opened by supply pressure of a fluid and is closed by its resilience if supply of a fluid is not stopped. The rubber closure is mounted between the inlet port and the outlet port to prevent the backflow of the fluid in the solenoid and interrupt a pollution source resulted from the backflow of the fluid.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principle of the invention. In the drawings:

FIG. 1 is a cross-sectional view of a conventional solenoid valve;

FIG. 2 is a cross-sectional view of a solenoid valve equipped with a backflow preventing device according to a first embodiment of the present invention;

FIGS. 3 a and 3b are cross-sectional views illustrating the operation of the solenoid valve shown in FIG. 2;

FIG. 4 is a cross-sectional view of a solenoid valve equipped with a backflow preventing device according to a second embodiment of the present invention; and

FIGS. 5 a and 5b are cross-sectional views illustrating the operation of the solenoid valve shown in FIG. 4.

Claims

1. A backflow preventing device for a solenoid valve including a solenoid valve which includes a body having an inlet port, an outlet port, and a valve seat interposed between the inlet port and the outlet port, and an opening part mounted on the body and having a plunger moved by an electromagnet and a spring, the backflow preventing device comprising: a closure of rubber mounted between the inlet port and the outlet port, and having a fluid supply line which is opened by supply pressure of a fluid and is closed by its resilience if supply of a fluid is not stopped.

2. A backflow preventing device for a solenoid valve including a solenoid valve which includes a body having an inlet port, an outlet port, and a valve seat interposed between the inlet port and the outlet port, and an opening part mounted on the body and having a plunger moved by an electromagnet and a spring, the backflow preventing device comprising: a closure of rubber mounted between the inlet port and the outlet port, and moved backward by pressure of a fluid supplied from the inlet port to open the inlet port, and is returned by the spring to close the inlet port if supply of a fluid is stopped.