气动执行器的单作用和双作用是什么意思

Safe attention
1.The pneumatic carrying out device should use within the range of fixed source of the gas pressure .
2.Will damage the carrying out device in operation which exceeds the pressure limit of the source of the gas .
3.The operation which exceeds temperature limit will damage inside part and spring to reduce and break down .
4.The inappropriate operating environment of prevention of corrosion may damage the part inside and outside of the carrying out device .
5.Must cut off the source of the gas when the line is maintained , can be maintained after emptying the inside remnants pressure of the carrying out device .
6.Don't dismantle the end and cover and disassemble the carrying out device when the carrying out device has pressures .
7.The instruction positions of positioning valve switch and carrying out device and position indicator must be correct and the same before the carrying out device is assembled with the valve.
8.While rotating and is worthy of debugging operating, make the hand and clothes far away from the valve open mouth, operate the personal security mainly.