General conditions for pneumatic circuits
- it is necessary to observe appropriate safety rules, instructions, recommendation and specifi ed parameters (temperature, pressure etc.), during setting in operation
- areas, which are pressurized even after closing of main air supply, should be specially marked in pneumatic circuits
- it is necessary to make allowance to product failure, eventually danger situations due to wrong operation, age or failure
- we reccomend to mark with special sign whole pneumatic circuits, where the high caution during service is necessary
- we do not reccomend to weld by electric arc on machinery, where pneumatic cylinders are mounted
- end users must take sufficient preventive steps to prevent injuries on material and health of employees
Conditions of use and running of pneumatic valves
- it is necessary to keep in mind, that spool of valve could be in undefined position, before first activation and uncontrolled movements should occur
- when 5/3 valves or non-return valves are used, it is necessary to keep in mind that some parts of circuit should be always pressurized - high caution during service is necessary
- it is necessary to observe listed technical data, especially pressure, air cleanness and solenoids voltage
- exhaust ports on valves should be equipped with silencers to prevent intrusion of junk into valve
- valves can work on either lubricated or non-lubricated air (for more information see chapter Modified compressed air)
| Port | Designation to ISO 5599 | Designation to DIN* | Designation to ANSI* |
| supply port |
1 | P | P |
| working line |
2 | A | B |
| exhaust line |
3 | R | EB |
| working line |
4 | B | A |
| exhaust line |
5 | S | EA |
| pilot line |
12 | Z | CA |
| pilot line |
14 | Y | CB |
Contact protecting when electromagnetic coils are used
Elektromagnetic coil is coil, which defend against any voltage change. Due this, it is possible, that voltage spike or electrical ark will occur when switching voltage. By this, the damage of isolation or contacts burning may occur. There are at least four ways how this danger eliminate:
- serial connection of RC circuit, it is necessary to calculate values of resistance and capacitor for each application
- for DC voltage, the diode could be used, it is neccessary to calculate values of diode for each application
- Zener diode could be used for AC even DC voltage, it is neccessary to calculate values of diode for each application
- varistor could be used for AC even DC voltage, varistor should be built-in in connector of valve (see connectors for valves)