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- upper stem seal 上阀杆密封
- For removal of valve stem seal and lower valve spring guide. 可用于拆卸汽门油封或降低汽门弹簧。
- Backseat ? machined bonnet stem bushing provides back-up stem seal. 后座-经过精密加工的阀盖阀杆衬套实现后座阀杆密封。
- Flowering: in leaf axils of upper stem (like raceme), blue. 花生于茎上部叶腋，在顶端如总状花序；花色较浅，近天蓝色。
- Maintenance-free O-ring stem seal with additional stem scrapper. 转柄具O形密合环，不需维护。并另有转柄清洁器。
- Stems sympodial, upper stem often zigzig, often 5-angled. 茎合轴，上面的茎通常曲折，通常具5个角。
- Two O-Rings in gland follower provide additional stem seal protection to assure tightness of less than 1 ppm. 密封压盖随动件内的两个O形环为阀杆提供更加安全的密封保护，以确保泄漏率不会超过百万分之一。
- Kit consists of: RV assembly, Seat, Seat O-ring, Cover O-ring, Sensing passage Oring and Upper stem O-ring. 组件包括：RV总成，阀座，阀座O形环，阀盖O形环，感应通道O形环和上部阀杆O形环。
- The upper stem is always attached to the diaphragms so there is no “free-spinning” point. 上阀杆总是和横膈膜连在一起，所以没有“自由旋转”点。
- Upper stem leaves reduced above, 3-dissected, lobules 3-lobed or parted, sharply serrate. 在上面退化的上面茎生叶，多裂的3，3浅裂或深裂，锐有锯齿。
- Flowers axillary, glomerulate, forming a loose, spikelike inflorescence on upper stem and branches. 腋生的花，团伞状，形成的一松散，穗状花序在上面茎和分枝上。
- If necessary, the stem and stem seal may be removed from the bonnet by removing the retainer ring and handle and screwing the stem out the under-side of the bonnet. 如果必要的话，阀杆和阀杆密封可能要从阀帽上拆卸下来，要在阀帽的下方先拆卸挡圈和手柄，以及阀座上的螺丝。
- Leaf blade 3-partite, rarely 3-sect. Upper stem leaves abaxially very densely silvery sericeous-strigose. Fl. Aug. 叶片3分裂，很少3全裂。上面茎生叶背面的密被银色被绢毛具糙伏毛。花期8月。
- Replaceable hose filter and valve stem seals for field reliability. 可更换软管过滤器和阀门阀杆密封,使得现场应用可靠行更高。
- At this point the upper stem has lost contact with the diaphragms. The valve should be opened to this point but not back seated. 在此时，上阀杆已经失去了同横膈膜的接触。阀门应该开启到这一点，但不能反向固定。
- The upper stem mechanically connects to the lower stem, providing positive lift without the use of a spring. (See Figure 6. 上阀杆机械地同下阀杆连接在一起，不使用弹簧就提供了正的升力。
- Safer and tighter stem seal. 更安全、更紧密地阀杆密封。
- When the handwheel is rotated to the closed position the upper stem pushes on the diaphragms, which deflect downward, forcing the lower stem against the valve seat. 当手轮旋转到关闭位置，上阀杆推动横膈膜，横膈膜下垂，迫使下阀杆接触阀座。
- Monoecious.Leaves alternate on upper stems or opposite on lower stems. 雌雄同株在上面茎或对生在下部茎上的叶互生。
- The point of penetration through the diaphragms is sealed by E-beam welding. When the upper stem rides up and down on its threads it now moves the lower stem by a mechanical connection. 通过横膈膜的穿透点用电子束焊接来密封。当上阀杆沿着它的螺纹上下运动时，通过机械连接带着下阀杆一起运动。
