| 摘要 |
<p>A valve assembly includes a valve housing (80) defining a service passage (94), a first bore (98) in fluid communication with the service passage, a first passage (120), a second bore (100) in communication with the service passage and a second passage (130). The first bore has an inlet portion (114), a first service portion (116) in communication with the service passage, and a first load holding portion (118). The first passage is in communication with the first load holding portion and the service passage. The second bore has a return portion (124), a second service portion (126) in fluid communication with the first service passage, and a second load holding portion (128). The second passage (130) is in selective communication with the second load holding portion of the second bore and the return passage. A valve is disposed in the second passage. The valve (132) allows fluid to flow only in a direction from the second load holding portion to the return passage.</p> |
