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SQP43 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 shaft-end pump	Displacement code of cover-end pump
SQP43	42、 45、 50、 57、 60、 66、 75	21、 25、 30、 32、 35、 38、 45

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). When using a flexible coupling, the maximum allowable angular error is less than 0.2 degrees; the pump shaft must not be subjected to radial and axial loads; the bracket must be strong and rigid, and able to fully absorb vibrations.

2. Secure the pipeline according to the port size, especially the inlet pipe, and assemble 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 leak-proof; 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 50 mm, to avoid bubble formation even at low levels.

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

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

5. The oil should be kept clean, and the pipelines and oil tank must be thoroughly cleaned; a precision filter should be assembled in the system, with a recommended accuracy of 25μm, and the oil cleanliness should be within NSA12. A filter with sufficient capacity (rated flow rate should be more than twice the pump flow rate) should be fixed at 50mm above the bottom of the oil tank at 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 identification SC, SD, SE, or SF, with a viscosity grade of 32 to 68 cSt at 40℃.

Preferred viscosity under 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 flexibly. It is best to fill the pump with oil before the first use.

During initial operation or operation after a long period of rest, the pump may have difficulty in drawing in liquid; in this case, a bleed 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. During startup, try to operate the pump intermittently without load.

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

9. At startup, if the oil viscosity 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
SQP43	1	62	12.7	14.2	31.75/31.70	35.25/35.10	7.94×28.5
SQP43	86	87.4	12.7	14.2	38.075/38.05	42.4/42.25	9.54×50.8

◎Splined Shaft

Model	Shaft Cooling	A	B	C	D	E	Spline Data
							Number of Teeth Number of Teeth	Pitch	Major Diameter Minor Diameter	Root Minor Diameter	Matching 12/24
SQP43	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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