| 摘要 |
<p>PCT No. PCT/AU93/00015 Sec. 371 Date Jul. 15, 1994 Sec. 102(e) Date Jul. 15, 1994 PCT Filed Jan. 15, 1993 PCT Pub. No. WO93/13971 PCT Pub. Date Jul. 22, 1993.A rotary valve having chamfers (26,39) at the groove edges (31) of its input shaft (10) which, in conjunction with axially extending troughs (44), form metering edge contours. The chamfers (26,39) and troughs (44) at the edges (31) of the grooves (18a,18b) interacting with sleeve slots (19) to reduce valve hiss and linearise the boost characteristic of the valve.</p> |
