Shenzhen zhenhui Machinery Co.,Ltd is specialized in screw air compressor ,air dryer,filter and so on. we have nearly 10 brands, such as Zhenhui, Xingbao, benwell, little swan, dswan and so on. The models are 7.5hp to 400hp, the air handling volume ranges from 1.0m3min to 45m3/min. The electrial source is 220V/380V, 50/60HZ. The refrigerant we use is R22 and R134.