1) XBD-HY (HYL) series converter tangent to the constant pressure fire pump characteristics are variable flow regulator, flow, lift curve is very flat, basic pump flow from zero to the desired maximum flow range changes, head change (head changes less than 5%), to ensure that the small flow or zero flow overpressure avoid large flow no water supply. This feature is fully consistent with the characteristics of the use of the fire scene to ensure the fire working properly, can greatly improve the efficiency of fire and fire-fighting equipment, the reliability and safety of firefighters. 2) variable flow constant pressure fire tangent pump for vertical, horizontal, split fire pump, the structure is very compact, small footprint, reliable mechanical seal pumps reasonable internal structure, high reliability, long life and smooth operation noise, maintenance-free, lifetime warranty. 3) This series pump drive motor Y series motor, without the pressure tank and frequency control to achieve constant pressure, significant savings in project cost, this marks a major breakthrough in our fire pump technology, will bring significant social and economic benefits. The series pump outlet to adjust the outlet direction 0 °, 90 °, 180 °, 270 °. Converter tangent to the constant pressure fire pump working conditions of medium temperature: ≤ 80 ° C water flow range :5-100L / s :0.3-2 .6 MPa pressure range Direction of rotation: looking from the motor, pump for clockwise rotation