| 摘要 |
<p>1,255,427. Valves. AUTOMATIC SWITCH CO. 3 Dec., 1969 [3 Dec., 1968], No. 58952/69. Heading F2V. A valve for permitting free flow in one direction and restricted flow in the opposite direction comprises a valve member 21 movable away from its seat against the force of resilient means 22 and a passageway 25, 26, 27 in the valve member which may be varied by manually adjustable means 30. A threaded stud 33 fitted with a plastic knob 35 adjusts the means 30 which may be adjusted downwardly to a sufficient extent first to close the passageway completely and then to hold the member 21 closed. A cam portion at the lower end of a pivoted lever 42 may be used to distort the lower portion of the knob 35 into engagement with a knurled portion on the valve bonnet to prevent accidental rotation of the stud 33.</p> |
