开关阀计算数据

哪位大神帮忙解释下下面各部分的含义及计算意义。

Breakaway torque [Nm] without safety factor
Max. allowable torque of the stem [Nm]
Max. allowable torque of the head flange [Nm]

Min. torque at 4,0 bar control pressure(spring)
Max. torque at 4,0 bar control pressure(spring)
Min. torque at 4,0 bar control pressure(air)
Max. torque at 4,0 bar control pressure(air)

Min. torque at 6,0 bar control pressure(spring)
Max. torque at 6,0 bar control pressure(spring)
Min. torque at 6,0 bar control pressure(air)
Max. torque at 6,0 bar control pressure(air)

Quick-action ventilating plate [ SEP connection 1/2" ]

Safety factor by 4,0 bar pressure control：
By min. torque at 4,0 bar control pressure(spring)
By max. torque at 4,0 bar control pressure(air)

Safety factor by 6,0 bar pressure control：
By min. torque at 6,0 bar control pressure(spring)
By max. torque at 6,0 bar control pressure(air)