HDSR series roots blower is our foundamental products, which is basis of our HG type roots blower, HDR series heavy duty rotary air blower, HDSR-WN series MVR steam compressor, HDSR series gas booster blower and HMGB series turbo blower, its stablity and more than 20 years market verification ensure excellent site performance. Meanwhile Its from HDSR series, we have become the most comprehensive roots blower product series in China and can fulfill different design requirement in every industry.