| 摘要 |
<p>A balanced valve disc and seat structure has a hollow valve disc engageable with the seat and pressure responsive means supported in the disc; the pressure responsive means divides the hollow valve disc into separate first and second chambers with a first aperture in the disc communicating with the first chamber and a second aperture in the disc communicating with the second chamber. A plunger has one end secured to the pressure responsive means with the other end of the plunger extending through the second chamber and the valve seat with means engaging the other end of the plunger when the first chamber has a higher pressure than the second chamber.</p> |
