| 摘要 |
The specification and drawings disclose a metering valve comprising a valve body having an inlet and an outlet with a metering orifice therebetween. A tapered needle member is adapted to enter the metering orifice. The needle is carried at the end of a stem extending laterally into the body. The stem is threadedly mounted in a bonnet for longitudinal adjustment to vary the position of the needle in the orifice to thereby regulate flow. Positioned between the body and the bonnet is a body extension member releasably connected to the body and having a bore through which the stem extends. The bore includes an inner portion which closely receives the stem and a larger diameter outer portion. A resilient guide ring is carried in the outer portion and closely surrounds the stem. The bonnet is threadedly connected to the body extension member and arranged to engage the guide ring to apply thereto a compressive load and produce tight but sliding engagement between the guide ring and the stem.
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