초록 ▼

A highly durable, inexpensive valve seat and valve unit are achieved by using a synthetic resin for forming the valve seat. The synthetic resin valve seat is equipped with a first valve aperture and a second valve aperture for inflow, and a third valve aperture for outflow. At least either the first

A highly durable, inexpensive valve seat and valve unit are achieved by using a synthetic resin for forming the valve seat. The synthetic resin valve seat is equipped with a first valve aperture and a second valve aperture for inflow, and a third valve aperture for outflow. At least either the first valve aperture or the second valve aperture is set in communication with the third valve aperture through a communication hole of a movable valve seat, or the first and second valve apertures are closed by the movable valve seat. A protuberance that slidably contacts the movable valve seat is formed on a surface of the synthetic resin valve seat that opposes the movable valve seat and on the opening edges of at least the first valve aperture and the second valve aperture such that the protuberance surrounds the first valve aperture and the second valve aperture.

대표청구항 ▼

[ What is claimed is:] [1.]1. A valve unit comprising:a valve case that accommodates a fixed valve seat secured therein and a movable valve seat movably installed therein such that these valve seats slidably contact each other;the fixed valve seat having first and second valve aperture for inflow, a

[ What is claimed is:] [1.]1. A valve unit comprising:a valve case that accommodates a fixed valve seat secured therein and a movable valve seat movably installed therein such that these valve seats slidably contact each other;the fixed valve seat having first and second valve aperture for inflow, and a third valve aperture for outflow;the movable valve seat being provided with a communication aperture that causes at least either the first valve aperture or the second valve aperture to be in communication with the third valve aperture when a valve is opened, while causing itself to be in communication only with the third valve aperture when the valve is closed; andthe movable valve seat being moved to a valve opening position or a valve closing position by opening and closing means,wherein at least the fixed valve seat out of the fixed valve seat and the movable valve seat is formed of a synthetic resin; anda protuberance that surrounds the first valve aperture and the second valve aperture is formed on at least the opening edges of the first valve aperture and the second valve aperture on a surface of the fixed valve seat that opposes the movable valve seat.