Straight trip regulating causes valve stem smaller: it involves a simple mechanical principle: sliding friction, rolling friction small. Straight trip valve stem up and down movement, packing slightly compressed, it will stem very tight package, have a greater difference. Therefore, the stem design is very small, they often fill a small friction coefficient of the PTFE packing, in order to reduce bad back, but this problem is to send small stem, is easily bent, packing too short life.
To solve this problem, the best way is to turn the 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 the friction torque is small, small hysteresis.
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