Valveprotection caps should be installed on cylinders at all times when not in use.
只要没有使用钢瓶，阀门保护帽要一直装在钢瓶上。
2
Leave the valveprotection cap in place until the cylinder has been secured in place and is ready to be used.
让阀门保护帽一直留在原位，直到钢瓶已经固定好，并准备使用。
3
Avoid areas where salt or other corrosive materials are present. Valveprotection caps and valve outlet seals should remain on cylinders not connected for use.