公开(公告)号：US20210230853A1

公开(公告)日：2021-07-29

申请号：US17051639

申请日：2019-05-17

申请人： AS America, Inc.

发明人： Marin Marinov ,  Walter Pitsch ,  Eric Soberano ,  Koji Shimizu ,  Kojiro Watari

IPC分类号： E03D3/06 ,  F16K21/12 ,  F16K31/385

摘要： Provided are valve devices and flow heads for a valve device. A valve device can include a valve body (30) that opens and closes a valve hole (15a) to allow communication between a primary flow path (17a) and a secondary flow path (17b), a back pressure chamber (7) defined at the back side of the valve body, a small hole (51) that is provided in the valve body to allow the primary flow path of and the back pressure chamber to communicate with each other, and a pin (6) that has a straight portion inserted into the small hole to clean the small hole by relative motions of the small hole and the straight portion. A flow head (34) may be annular and include one or more notches along a perimeter and be configured to engage with an inner peripheral surface of an upper end portion of an inner barrel of the valve device.