| 摘要 |
PURPOSE: A dual check valve is provided to make passing of fluid possible when inflow pressure of fluid is over the set pressure by making a second valve not take the strength caused by spring compression of a first valve, and to coincide with perfect reverse flow preventing conditions. CONSTITUTION: A dual check valve is equipped with a valve body(1) and a housing(2). The valve body has an inlet(3), an outlet having an outflow passage(5), and a strainer mesh(6). The housing prevent a counter flow of the inside of the valve. A first and second valve(9,10) opening and shutting a first and second disk(11,12) formed inside of the housing is supported by the elasticity of springs(15,16). The housing is divided into a first and second housing(7,8) and the second is coupled to the outflow passage and the first housing is coupled to the upper part of the second housing. Slide brackets(13,14), supported by the springs and lifting along the inner wall of the first and second housing, is installed to the inside of the first and second housing. The first and second valve is installed in the middle of the slide bracket. Therefore the first and second valve is adhered closely with the first and second disk.
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