The OBL MB/MC series are mechanical diaphragm pumps with spring return mechanism, eccentric shaft and thrust ring. They combine the working characteristics of a plunger pump with the sealing advantages of a diaphragm pump. 

General features
• Diaphragm, economic, robust, compact metering pump.
• The mechanical diaphragm works, both giving the swept volume, acting basically as plunger, and as separator between crank gear and the handled fluid.
• Easy and minimum maintenance required, thanks to the reduced number of components.
• The OBL’s unique (patented) mechanical diaphragm design ensures linearity between flow rate and percentage of stroke. The flow rate is virtually uneffected by the working pressure variations.
• Leak-free pump, due to OBL’s stress-proof diaphragm.
• High working safety:
- No external moving parts.
- Leak-free operations.