pressure-balanced structure, Axial load small, long operating life , sinple structure to open The product is widely ... the low pressure pump .1. High performance, low noise and long life, easily to be maintained. 2. Very competitive price3. inner ... pump(17ml/rev), low-duty pump(6.8ml/rev)4. revolving speed: min.: 600r/min; max: 1800r/min5. weight: frange type ...