Title:
COLD BOX VALVE
Document Type and Number:
Japanese Patent JPS6034578
Kind Code:
A
Abstract:
A cold box valve, employed in cryogenic environments, includes a valve body assembly with a fluid inlet and a fluid outlet. The valve body assembly includes a valve body and bonnet. The bonnet seals the top of the valve body to which access to the valve internals is provided. A trim assembly, including an inner tube is removably mounted within the valve body. A cage is secured to the inner tube and a valve seat ring is removably mounted on the cage by at least one pin. Once assembled, the valve seat ring engages the valve body surrounding an opening between the valve inlet and valve outlet. A seal is mounted within the valve seat ring to provide a fluid seal between the valve seat ring and the valve body. A valve plug is reciprocally mounted within the cage and a stem connected to the plug extends out of the body to be connected to an actuator. A spring is mounted within the valve bonnet and engages the inner tube for biasing the valve seat ring into engagement with the valve body. A retainer is mounted within the valve bonnet that includes an extension for engaging a lip defined on the spring. Upon removal of the trim assembly, the retainer retains the spring within the valve bonet. Angled surfaces are fabricated on the inner peripheral surface of the valve body and are complementary to angled surfaces on the valve seat. The surfaces function to guide the trim assembly into the valve body during assembly.
Inventors:
PIITAA KEI MERIRU
Application Number:
JP12006384A
Publication Date:
February 22, 1985
Filing Date:
June 13, 1984
Export Citation:
Assignee:
MC GRAW EDISON CO
International Classes:
F16K3/24; F16K43/00; (IPC1-7): F16K3/24
Attorney, Agent or Firm:
Ashida Tan