| 摘要 |
An enclosed gate valve for handling dry particulate material has a rectangular housing, and a curved flow control blade moves through the housing adjacent a housing inlet. The flow control blade is moved by an air cylinder mounted on an inclined and laterally offset wall of a housing compartment. A direct connection is formed between the piston rod of the air cylinder and the arm means supporting the curved flow control blade so that force from the cylinder is applied directly to the blade along a line of movement which is substantially tangent to the arc of blade movement to provide maximum advantage of the power available from the air motor in both the opening and the closing directions. Embodiments are shown of coupling arrangements for attaching the piston rod of the air motor to the blade arms. An indicator pointer provides a visual indication of the movement of the curved blade.
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