| 摘要 |
<p>The mechanism prevents erroneous commands caused by brief accidental pulses and comprises, in conjuction with a rotary shutter (10) that moves intermittently, a chamber (3, 3A) with a float (5) connected to said shutter, the pressure on which is generated by the arrival of fluid and the resultant filling of said chamber; a discharge device (30, 34) causes said chamber to empty slowly within a period of time that is not less than a predeterined limit and which starts when the working pressure is released; cam devices (40, 42) cause a one-step movement of said shutter only when said chamber is completely empty.</p> |
