| 摘要 |
<p>PURPOSE: To create two parts when a shut-off cock is opened by sealingly connecting the two ends of a flexible pipe to the ends of a rigid pipe and providing a control orifice and core near the center passing through the wall of the rigid pipe. CONSTITUTION: With tanks 25 and 26 not interconnected, and a shut-off cock 28 closed the pressure P1 at a control entrance D is higher than the pressure P2 that a control entrance E receives, accordingly, a communication passage, which is established through a slide valve 30 is shown by the dotted lines. The blank section 7 in a valve 16 receives the atmospheric pressure Pa, which is higher than the pressure P2 that the inside of the flexible pipe 4 in the valve 16 receives. Therefore, the pressure Pa closes the flexible pipe 4, but the closing is not complete. When the cock 28 opens, pressure equalization is slowly achieved through the valve 16. When the pressure P1 and P2 are equalized to each other, a selective control valve 30 is switched as shown by the actual lines. The pressure of the blank section 7 becomes the same as the pressure P2, which is the same as the inner pressure of the pipe 4, as a result, the elasticity of the pipe 4 allows the pipe 4 to take a opening position.</p> |
