Security on the pneumatic valve with CSC and CSO said what mean

security pneumatic valve on the CSC and CSO, called the CSC car sealed closed, called the CSO car sealed open, the former CSC said seal clearance, the latter CSO said seal. On many equipment before and after the safety of the pneumatic valve gate are pneumatic valve seal, when security expire pneumatic valve needs to be more pressure, also have to put the two pneumatic remove pneumatic valve for pressure safety valve is closed. If security pneumatic valve fault during normal production, in a short period of time shut down for safety of the pneumatic valve replacement or emergency repairs, can improve the equipment operation rate, avoid frequent parking. If blasting or security pneumatic valve pneumatic valve is in front of CSC, also is to seal off the pneumatic valve, pneumatic valve when blasting or security the installed container pressure is higher than the set pressure, pneumatic valve does not automatically open, CSC means or safety pneumatic valve will not be able to work, and no leakage, pressure either CSC pneumatic valve damage, or container blowout, blasting or pneumatic valve for container security protection is lost.
the CSC car seal is the abbreviation of the close, said lead seal clearance.
CSO is the abbreviation of car seal open, said lead seal.
seal and seal close is a kind of safety management measures.
to seal off the car seal close said seal of pneumatic valve is closed, without permission shall not open it.
seal open car seal open said seal of pneumatic valve is open, without permission shall not be shut down.
add seal ( Like instrument calibration seal) Pneumatic valves, the state is not allowed to change, once changed, the seal will be destroyed, to related records, and seal again. （ 山)