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SQP42 Low-Noise Vane Pump

Key words:Hydraulic tools

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SQP series low noise vane pumps

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Specification

Series	Displacement code of axial piston pump	Displacement code of cover piston pump
SQP42	42、 45、 50、 57、 60、 66、 75	10、 12、 14、 15、 17、 19、 21、 25

Model code

Installation and Use

1. During installation, the concentricity tolerance between the pump shaft and the motor must be less than 0.10 mm (TIR), the maximum allowable angular error must be less than 0.2 degrees, and a flexible coupling must be used; the pump shaft must not be subjected to radial and axial loads; the bracket must be sturdy, rigid, and able to fully absorb vibration.

2. Secure the piping according to the diameter size, especially the inlet pipe, and install a safety relief valve in the system (inlet flow rate between 0.5 and 1.5 m/s). The set pressure of the safety valve must not exceed the maximum pressure of the pump; the inlet pipe must be strictly sealed and must not leak water; the oil tank should be equipped with a diaphragm to separate bubbles and dirt from the oil; the oil return nozzle should be below the liquid level, with a minimum depth of 50mm, even at low positions, to avoid the formation of bubbles.

3. Set the suction pressure at the pump inlet: +35~ -16.7 KPa for hydraulic oil. +35~ -10.1 KPa for water-ethylene glycol and phosphate ester hydraulic oil.

4. If the pump is mounted on the oil tank or above the oil tank cover, the suction port height of the pump should be less than 500mm.

5. The oil should be kept clean, and the pipes and oil tank must be thoroughly cleaned; a precision filter should be installed in the system, with a recommended accuracy of 25μm, and the oil cleanliness should be within NSA12. Install a filter with sufficient capacity (rated flow rate should be more than twice the pump flow rate) 50mm above the pump inlet, with a recommended accuracy of 100μm (150 mesh).

6. It is recommended to use anti-wear industrial hydraulic oil or automotive crankcase oil with the letter designation SC, SD, SE, or SF, with a viscosity grade of 32 to 68 cSt at 40℃.

Optimal viscosity at rated speed and pressure:

Minimum 13cSt Maximum 54cSt

Minimum 49℃ Maximum 65℃

7. Check the inlet, outlet, and direction of rotation before starting the pump. After fixing the pump, manually rotate the pump shaft evenly and smoothly. It is best to fill the pump with oil during the first use.

During initial operation or operation after a long shutdown, the pump may have difficulty sucking in liquid; in this case, a vent valve should be installed on the discharge side in advance, or the air should be discharged by slightly loosening the connection on the discharge side. Try to operate the pump intermittently without load during startup.

8. Do not start the pump when the outlet pressure is lower than the inlet pressure. This will cause operating noise and blade instability.

9. At startup, if the viscosity of the oil is higher than the suitable viscosity (54cSt), the pressure should be limited to 50% or less of the respective rated value until the system warms up.

Installation Connection Dimensions

◎ Key shaft

Model	Shaft Cooling	A	B	C	D	E	F Key Width × Length
SQP42	1	62	12.7	14.2	31.75/31.70	35.25/35.10	7.94×28.5
SQP42	86	87.4	12.7	14.2	38.075/38.05	42.4/42.25	9.54×50.8

◎ Spline shaft

Model	Shaft Cooling	A	B	C	D	E	Spline Data
							Quantity Number of Teeth	Pitch	Major Diameter Minor Diameter	Root Minor Diameter	Matching 12/24
SQP42	11	61.9	12.7	14.3	9.7	39.6	14	31.7/31.67	26.99/26.64	Major Diameter Fit	Large diameter fit

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