NL Block valve adjusting
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- Screw number 1 NL+ Soft Stop: Maximum pressure valve adjustment
- Screw number 2: Upward and downward low speed adjustment
- Screw number 3: Rod counter pressure adjustment and rope anti-loosening device adjusting
- Screw number 4: Screw device for the rupture valve testing
- Screw number 5: Slowdown adjustment upward and downward direction
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