| 摘要 |
<p>The valve comprises a body (1) in which is formed a cylindrical chamber (2) provided with a side inlet (14) and an outlet (3). Said chamber includes a spring-loaded (22) piston (4) which is attached to a rod (6) the end of which acts as a seal. Te rod (6) is further provided with a section reducer (9) consisting for example of a perforated cylindircal bearing surface. The inlet (14) is located between the piston (4) and the section reducer (9). The difference between the forces acting on the piston and the section reducer makes the piston move backwards, the valve opens and the section reducer substantially seals the inlet (14).</p> |
