| 摘要 |
<p>An apparatus 1 for mixing first and second gases includes first and second valves 2, 3 each having a stem 14 the axial movement of which controls the flow of the gases through their respective valves. Each valve stem has one end engaging a control surface 16 of a thrust plate 18 mounted for axial and pivotal movement on a shaft 20. Means including a plunger 26 is provided for pivoting the thrust 18 so that one valve stem is moved axially relative to the other thereby increasing the rate of flow of one gas through its respective valve while concomitantly decreasing the rate of flow of the other gas through its respective valve to vary the relative proportion of the gases without varying the total flow rate. Total flow adjuster 34 bears on the plunger 26 for moving the thrust plate 18 axially towards and away from the valve stems 14 thereby to vary the total rate of flow of the gases without varying the relative proportions of each gas flowing through its respective valve.</p> |
