| 摘要 |
A flow control (or metering) valve characterized in the provision of a combined pintle-spool type valve member in which the pintle valve portion cooperates with a large diameter seat in the housing so as to require large operating forces which, in turn, minimize the effects of friction and hysteresis losses and in which the adjacent spool valve portion is a close sliding fit in the housing bore and has one or more metering slots formed in its periphery to cooperate with the aforesaid seat to meter the flow through the valve with low gain owing to the metering area being independent of the spool size. The valve herein is further characterized in that the spool metering portion is of relatively short axial length and in that the valve member has an elongated small diameter guide portion which is guided in the housing at a zone spaced a substantial distance from the metering portion and seating portion so as to prevent cocking and sticking of the valve member despite the very close fit between the spool portion and housing bore and a relatively looser fit between the spaced guide portion of the valve member.
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