1. This unit with no slide or rotate part and matches low rate within pump body during pumping, to attach excellent efficiency for pumping the abrasion or high viscosity liquid.
2. Adjusting pumping rate & pressure regulations and no necessary to use hight cost speed changeable motor or drive device
3. Allows long time idle running and will not cases any damage
4. the input pressure will never excess the output pressure, therefore no necessary to use pressure release device or by-pass
5. Applying in the environment that may cases explosion and no necessary to attach any explosion resist motor or controller
6. Use air as a diaphragm power driver, therefore, pressure balance will, diaphragm not easy to be damage and functions efficiency excellent.

Pump small and light, could be move to any place in any time