초록 ▼

A valve assembly for controlling flow of cryogenic fluids is disclosed. In an embodiment, the valve assembly includes a valve housing and a valve member supported at the valve housing for movement between a valve opened and a valve closing position. A pneumatic cylinder is disposed laterally spaced

A valve assembly for controlling flow of cryogenic fluids is disclosed. In an embodiment, the valve assembly includes a valve housing and a valve member supported at the valve housing for movement between a valve opened and a valve closing position. A pneumatic cylinder is disposed laterally spaced from the valve member and thermally isolated with respect to cryogenic fluids controlled by the valve member. A lever operatively connects the pneumatic cylinder with the valve member and a linkage is pivotally connected with the lever at a position spaced from the valve member. The valve member is a needle valve member supported for axial movement at the housing.

대표청구항 ▼

What is claimed is: 1. A valve assembly for controlling flow of a cryogenic fluid, comprising: a valve assembly platform; a valve housing disposed on a top surface of the valve assembly platform, wherein a cryogenic fluid inlet orifice is disposed on the valve housing above the top surface of the v

What is claimed is: 1. A valve assembly for controlling flow of a cryogenic fluid, comprising: a valve assembly platform; a valve housing disposed on a top surface of the valve assembly platform, wherein a cryogenic fluid inlet orifice is disposed on the valve housing above the top surface of the valve assembly platform and wherein a cryogenic fluid outlet orifice is disposed on the valve housing at an under surface of the valve assembly platform, a valve member supported at the valve housing for movement between a cryogenic fluid outlet orifice open position and a cryogenic fluid outlet orifice closed position, a pneumatic cylinder disposed on the top surface of the valve assembly platform and laterally spaced from the valve member and thermally isolated with respect to a cryogenic fluid controlled by the valve member, a lever operatively connecting the pneumatic cylinder with the valve member, and a linkage pivotally connected with the lever at a position spaced from the valve member. 2. A valve assembly according to claim 1, wherein the pneumatic cylinder applies a force to the valve member in both a closing and an opening direction. 3. A valve assembly according to claim 1, wherein the linkage has one end pivotally connected with the lever and an opposite end pivotally connected at the valve assembly platform. 4. A valve assembly according to claim 1, wherein the pneumatic cylinder is a single acting cylinder operable to apply a force in only one direction of movement of the lever, and wherein a spring is provided to act on the lever in an opposite direction. 5. A valve assembly according to claim 1, wherein the valve member is a needle valve member supported for axial movement at the valve housing. 6. A valve assembly according to claim 1, further comprising a spring wherein a first end of the spring is attached to the lever and a second end of the spring is attached to the valve assembly platform. 7. A valve assembly according to claim 1, wherein a longitudinal axis of the cryogenic fluid inlet orifice is perpendicular to a longitudinal axis of the valve housing.