| 摘要 |
Embodiments of the invention provide a relief valve including a main valve having an inlet, an outlet, a piston assembly arranged between the inlet and the outlet and a rupture disk assembly arranged adjacent to and in fluid communication with the inlet. The relief valve further includes an unloader valve having, a bias pressure inlet, a bias pressure outlet, and an unloader valve element moveable between a first unloader position where fluid communication is inhibited between the bias pressure inlet and the bias pressure outlet and a second position where fluid communication is provided between the bias pressure inlet and the bias pressure outlet. The relief valve further includes a pilot valve having a pilot inlet port in fluid communication with the inlet upstream of the rupture disk, a pilot exhaust port in fluid communication with the outlet, and a pilot dome port. |
| 主权项 |
1. A relief valve comprising:
a main valve including
an inlet,an outlet,a piston assembly arranged between the inlet and the outlet and moveable between a first position where fluid communication is inhibited between the inlet and the outlet, and a second position where fluid communication is provided between the inlet and the outlet, the piston moving toward the second position when a predetermined opening pressure is achieved in the inlet, anda rupture disk assembly including a rupture disk arranged adjacent to and in fluid communication with the inlet, the rupture disk assembly defining a bias pressure chamber arranged downstream of the rupture disk and upstream of the piston assembly; a bias pressure source providing a bias pressure to the bias pressure chamber; an unloader valve configured to selectively provide fluid communication between the bias pressure chamber and the outlet; and a pilot valve configured to selectively provide communication between the unloader valve and the outlet. |
