Serial trunnion ball valves are mainly applied to natural gas,oil products,chemical engineering,metallurgy,city building,environment protection,pharmacy and food industries,among which the anti-sulphur searies are used for long delivery pipes of natural gas that contains hydrogen sulphide medium,a lot of impurity and corrosive substances.

The series of Parallel single-disc gate valves have diversion hole, no-diversion hole and adjustment structure formations which are applied to natural gas, oil products, chemical engineering, city construction and environment protection industries. The anti-sulphur product series are fit for high speed long delivery pipeline of seriously eroded natural gas which contains H2S medium and much impurity.