... long product life. 2, Electrical limit and machinery limit design, accurate position, avoid gear and switch. 3, Multi-assembling, easy ... for heavy pollution conditions. 5, good substitution for solenoid valve. 6, High protection class, can be worked in moistconditions ... , IC card meters, heat energy meters, air-warm valve. 2, HVAC and fire work. 3, Water equipment, uto-controlwatersystem, industrial ...