| 摘要 |
A tubular casing having a longitudinally extending passageway therein receives a valving member. Three inlet ports are formed along one side of the casing. An identical number of orifices are formed in a confronting face of the valving member. The spacing between orifices is such that only one of the inlet ports communicates with a respective orifice in any particular position. The central portion of the valving member includes a chamber which communicates with the orifices. A plurality of orifices are formed along an oppositely disposed face of the valving member in relation to an outlet port. Thus, in any particular position of the valving member selective communication between one of the inlet ports and the outlet port can be effected.
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