... brass gear, PPO parts, large output torque, long product life. 2, Electrical limit and machinery limit design, accurate position, avoid gear ... switch. 3, Multi-assembling, easy to install. 4, Float ball structure, no leakage, especially suitable for heavy pollution conditions. 5 ... 1, IC card meters, heat energy meters, air-warm valve. 2, HVAC and fire work. 3, Water equipment, uto-controlwatersystem, ...