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SQP31 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
SQP31	21、 25、 30、 32、 35、 38、 45	2、 3、 4、 5、 6、 7、 8、 9、 10、 11、 12、 14

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 bear radial and axial loads; the bracket must be strong and rigid, and able to fully absorb vibration.

2. Secure the pipeline according to the size, especially the inlet pipe, and assemble a safety pressure 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; 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, even at low positions, to avoid bubble formation.

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 installed on the oil tank or above the oil tank cover, the suction port 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 precision 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 50 mm above the bottom of the oil tank at the pump inlet, with a recommended precision 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℃.

Preferred viscosity at rated speed and pressure:

Minimum 13cSt Maximum 54cSt

Minimum 49℃ Maximum 65℃

7. Check the inlet, outlet, and rotation direction before starting the pump. After fixing the pump, manually rotate the pump shaft evenly and flexibly. It is best to add oil to the pump for the first use.

In the initial operation or operation after a long rest, the pump may have difficulty in sucking 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. 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 operating 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 Size

◎ Key Shaft

Model	Shaft Cooling	A	B	C	D	E	F Key Width × Length
SQP31	1	73.2	9.5	11.1	31.75/31.72	35.25/35.10	7.94×40
SQP31	86	86.4	9.5	11.1	34.90/34.87	38.4/38.15	7.94×54

◎ Spline Shaft

Model	Shaft Cooling	A	B	C	D	E	Spline Data
							Number of Teeth of Teeth	Pitch	Large Diameter	Small Diameter	Square Root Matching
SQP31	11	58.7	9.5	11.1	6.35	35.1	14	12/24	31.7/31.67	26.99/26.64	Large Diameter Matching

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