| 摘要 |
A fluid valve which upon opening or closing does not displace any fluid in the system because the volume in the fluid line is maintained constant. This is accomplished by means of an actuator operated flexible diaphragm which faces the fluid line and which, on its opposite side, faces a sealed chamber completely filled with a liquid, such as water. When the diaphragm is moved away from the chamber, its central portion closes the valve. Since the volume in the chamber will not change, the diaphragm will flex and accordingly the volume in the fluid line will not change. The actuator is within the sealed chamber and is electromagnetically movable by a coil as in a solenoid.
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