公开(公告)号：US10112594B2

公开(公告)日：2018-10-30

申请号：US14862347

申请日：2015-09-23

申请人： Amsted Rail Company, Inc.

发明人： Daniel Goujon ,  Patrick Adams ,  Roberto Correndo ,  Mickael Marechal ,  Daniel Brushwood

IPC分类号： B60T15/18 ,  F16K7/00 ,  F16K15/14

摘要： Valves for maintaining brake cylinder pressure in freight car brake equipment are provided. A valve includes a first diaphragm defining a first side and a second side, and a second diaphragm defining a first side and a second side. The valve further includes a first port for receiving pressure from one of an emergency reservoir or a control volume, the first port in fluid communication with the first side of the first diaphragm; a second port for receiving pressure from a brake pipe, the second port in fluid communication with the second side of the first diaphragm; and a third port for receiving pressure from a brake cylinder, the third port in fluid communication with the second side of the second diaphragm.