Solve this problem, the best way is to turn valve stem with a tour, or rotary type control valve, and its thick stem stroke than a straight stem 2 to 3 times, and use long life of the graphite packing, valve stem stiffness Good, filling long life, but its friction torque is small, poor little back.

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Leaves crowded near apex of the trunk, spirally arranged; stipes dark brown, with sharp spines; lamina large, oblong, tripinnate; pinnae 17-20 pairs, alternate, longest one to 60 cm long, the basal one reduced; rachis short-spiny; pinnules 18-20 pairs, sessile or nearly so, lanceolate, to 10 cm long and 2.5 cm wide, divided almost to the costa; segments more or less falcate, toothed.

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Leaves tufted; stipes 3-10 cm long, glabrous, narrowly winged near apex; lamina oblong-ovate to triangular, generally 10-12 cm long, bi- or tripinnate; pinnae 3-5 pairs, oblong-ovate, sessile; rachis narrowly winged; pinnules pinnately dissected, segments linear.

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Stem erect or procumbent, Leaves alternate, linear, 2-12 cm long, 1-3 mm wide, covered with white or red long glandular hairs; stipule absent; petiole short glandular-hairy or glabrous.

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Leaves rosette, orbicular to oblanceolate or linear, 0.5-1.2 cm long, 2-4 mm wide, with glandular hairs; stipule membranous, light red, 5 mm, deeply 3-parted, middle lobe larger, 2- or 3-lobed at apex; petiole flattened, 1-3.2 cm long, glandular or glabrous.

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Leaves thin-leathery, oblong-lanceolate to lanceolate, 6.5-13cm long, 2.5-4.5cm wide, blunt to blunt-acuminate at apex, cuneate at base ,lustrous on leaf surface, stellate-hairy beneath; petiole1-2.5cm long, stipule bract-like, leathery, caducous.

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