Sumitomo QT Series - Pressure Specifications

HMP-0567E Rev.7 (11/19)
f) It is recommended to use a rubber hose as the delivery pipe in order to reduce the vibration and
noise produced by the unit, and to prevent excessive force being exerted on the pump.
8) Pressure specifications
a) Definitions of "rated pressure" and "maximum pressure"
Rated pressure: Pressure at which the pump is able to operate on a continuous basis
Maximum pressure: Pressure at which the pump is able to operate over a period of 1/3 of
a cycle, with the maximum possible continuous operation period per
cycle being 20 seconds
In other words, after 20 seconds of operation at the maximum pressure, the pump should
operate at a pressure below the rated pressure for the remaining 40 seconds.
Table-3.8.1 QT Pump Pressure specifications
Unit: MPa (kgf/cm
2
)
QT*1
Low-pressure
type
QT*2
Medium-pressure
type
QT*3
High-pressure
type
QT*4
Ultra-high-press
ure type
Rated pressure
6.9 (70)
13.7 (140)
24.5 (250)
31.4 (320)
Maximum pressure
7.8 (80)
15.7 (160)
31.4 (320)
34.3 (350)
Table-3.8.2 QX Pump Pressure specifications
Unit: MPa (kgf/cm
2
)
QX*1
Low-pressure
type
QX*2
Medium-pressure
type
QX*3
High-pressure
type
QX*H
Ultra-high-press
ure type
Rated pressure
9.8 (100)
20.6 (210)
24.5 (250)
31.4 (320)
Maximum pressure
12.3 (125)
24.5 (250)
31.4 (320)
39.2 (400)
QX6H: 34.3 (350)
Rated / Maximum pressure and allowable shaft speed of QT2* and QX2* are different from the
above table. Please check with specification or external dimensions drawing of the pump.
b) Surge pressure
Ensure that pressure, including surge pressure, does not exceed the maximum pressure.