W series of pumps adopt the circle-shaped stationary valve and its ultimate pressure (absolute pressure) is lower than 2600Pa,while the WY series of pumps adopt stripe-shaped moving valves,and it’s ultimate pressure is lower than 1300Pa? This series of pumps are principally used in the trade of chemical industry,medicine-manufacturing,light industry, architecture material and wiring etc..We also serve the no-oil pumps according to the demand of user.
