Hydraulic Gear Pump AZPW

External gear pump AZPW

The displacement of the PA-AZPW series of POOCCA external gear pumps ranges from 1cc to 7cc. Slide bearings for heavy duty applications, Long service life thru reinforced design of shafts and gray cast iron cover.

Name	PA-AZPW Series Hydraulic gear pump
Series	Series W
Sizes	4 5.5 8 11 14 16 19 22.5
Nominal Pressure	190 bar
Maximum Pressure	210 bar
Operation Mode	External Gear Pumps

AZPW
Displacement		V	cm3/rev	4	5.5	8	11	14	16	19	22.5
Suction pressure pe				0.7...3 (absolute), with tandem pumps: pe ( p2) = max. 0.5 > pe ( p1)
Max. continuous pressure p1			bar	190						180	170
Max. intermittent pressure p2				210						200	190
Max. peak pressure p3				230						220	210
Min. rotational speed at bar	12 mm2/s 25 mm2/s	< 100bar	rpm	700	700	700	700	700	700	700	700
		100...180bar		1200	1200	1000	1000	800	800	800	800
		180... p2		1400	1400	1400	1200	1000	1000	1000	1000
		p2		700	700	700	700	700	700	700	700
Max. rotational speed at p2				3500			3500	3000	3000	3000	2500

POOCCA external gear pumps are available as standard performance gear pumps in the series W. The displace- ments are graded by different gear widths. Further configu- ration variants are given by different flanges, shafts, valve arrangements and multiple pump combinations.

The external gear pump consists essentially of a pair of gear wheels supported in bearing bushes and the housing with a front and a rear cover. The drive shaft protrudes from the front cover where it is usually sealed by the shaft seal. The bearing forces are absorbed by slide bearings.

These were designed for high pressures and have excellent emergency running properties, especially at low rotational speeds. The gear wheels have 12 teeth. This keeps both flow pulsation and noise emission to a minimum. The inter- nal sealing of the pressure chambers is achieved by delivery pressure-dependent forces. 

This ensures optimum effi- ciency. On the rear side, the movable bearing bushes are pressurized with working pressure and pressed as seals against the gear wheels. Special seals form the boundary of the pressurized zone. The radial sealing at the tips of the gear teeth against the case is provided by smallest possible gaps that are formed pressure-dependent between the gear wheels and the housing.

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