| 摘要 |
<p>This invention is of a selective valve to pass fluids and consists of a body, and a housing, and is provided above and in the middle with a communicating passage for low surface tension and viscosity fluid, there being shells inside, seated upon the aforesaid housing, said shells consisting of a surface of a shape and a size that is controlled, a soft surface, and orifices, a sealing surface created in the contact area of the aforesaid shells where it meets the aforesaid housing, and there being, below and in the middle, a communicating passage in touch with the fluid compressed by the pump. Preferred versions of the aforesaid selective valve are also covered, provided with controlling blades and a ball and roughness controlling surfaces instead of the shells.</p> |
