Asahi Yukizai Kogyo Co., Ltd.

Youichi Ninomiya

Tomoyuki Ueda

Kazuhiko Tsuno

Hirotoshi Ogawa

Masataka Machida

The invention relates to a disposable ball valve assembly mainly composed of a ball valve member made of a plastic resin material, a valve stem made of a plastic resin material and coupled with the ball valve member, and a valve body having a valve cavity formed therein for movably mounting the ball valve member. For improving the disposability, the valve body is substantially composed of a first body element made of a plastic resin material and having a portion thereof shaped to define a female connection, and a second body element made of a plastic resin material and having a portion thereof shaped to define a male connection inserted into the female connection. These first and second body elements are permanently coupled and rigidly interconnected to each other by these two connections with the end of the male connection being spaced from an interior portion of the first body element to define therebetween a valve chamber holding the ball valve member for the establishment of the disposability. These first and second body elements have non-threaded and inwardly reducedly stepped bores formed therein. The ball valve member is rotatable for fluid flow on-off control. Portions of these body elements define the valve chamber. The ball valve member, sealing ring means sealingly coacting therewith, the valve stem, O-ring(s) serving as sealing means between the valve stem and the valve body are positioned therein in an unseparable manner from the valve body for attaining the disposability.

Ball valve assembly

The invention relates to a butterfly valve assembly having a stationary valve body formed with an axial fluid flow passage opening and a turnable valve member adapted for full opening, partial opening and full closing of the said passage opening. There is provided further a valve seat ring composed of an inner protecting layer of fluoride containing resin and an outer back-up layer of rubber or its equivalent. According to this invention, at least two parallel ring grooves are provided on the radially outwardly directing surface of the said elastomer layer which has a substantially channel-shaped cross-section embracing a substantial part of the valve body when the valve seat ring is attached in position to the valve body. Further, each of both chords of the channel in its cross-section are opposingly bulged out inwardly at the both ends of each channel chord for creating and maintaining each a tongue-and-recess mode intimate connection between the valve body and the elastomer layer, when the valve seat ring is attached to the valve body. Still further, a small idle gap is formed in each of the inner corners of the channel for receiving occasional and radial physical deformation of the elastomer layer caused by repeated operation of the valve member.

Growing community of inventors

Nobeoka, Japan

Youichi Ninomiya