meaning of symbols in electrical schemas

Hello,

I am new in automation. In my actual project I should transfer
old electrical schema (on paper) to CAM software. In this schema I cannot understand the meaning of some symbols. For example there is about 10 different symbols of valves without explication.

Where could I find in Internet some sources with corresponding information.

Thank you in advance for your help.

Pavel.

Here are some pages from Ron's site with information that may be helpful.

Electrical

Hydraulic

Good Luck