| 摘要 |
A two-position, four-way valve assembly incorporates poppet valve elements (72, 86, 88) mounted upon a single shaft (70) for simultaneous operation. Only one (72) of the valve elements is engageable selectively with a fixed valve seats (66, 68), the remaining valve elements (86, 88) being engageable with respective movable valve seats (42, 44) whereby dimensional variations due to manufacturing tolerances may be accommodated. Additionally, the valve elements and seats are sized relative to each other to create a net force due to the pressurized fluid acting thereon which force operates to maintain the valve elements in a stable condition in either of the two positions, to urge the respective movable valve seats into sealing engagement with the respective valve elements, and to return the movable valve seats to a predetermined position upon disengagement of the associated valve element. <IMAGE> |
