Rotary Gear Pumps

SUPERBLY MACHINED AND CAREFULLY-DESIGNED

Our pumps are designed to handle many transfer and manufacturing applications. We sell to the adhesives market (plywood, glue manufacturing, laminates), petroleum market (transfer, sludges, production), chemicals, and explosive slurries markets.

Whether your application involves abrasive, viscous or corrosive applications NAPCO can assist you with your pumping needs.

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NAPCO rotary gear pumps are available in 2″ and 3″ outlet port sizes and in 316 stainless steel or ductile iron construction. We currently produce gears in both nitrile rubber or viton.

Offering 65 to 350 GPM capacities, self priming, clockwise or counter-clockwise operation, top or bottom impeller driven, the NAPCO Rotary Gear Pump handles a broad range of pumping applications.

THE NAPCO ROTARY GEAR PUMP INCORPORATES THE LATEST DESIGN AND MANUFACTURING STANDARDS

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OPERATIONAL DESIGN

The NAPCO rotary gear pump is available in 316 stainless steel and ductile iron, and can handle a broad range of pumping applications from water to highly viscous or abrasive fluids. It can also handle some corrosive fluids. It comes fully lubricated and ready for use. It operates clockwise or counter-clockwise with equal efficiency. The rotary gears come standard in high temperature nitrile rubber, but neoprene, viton and other gear material can be ordered to handle special higher temperature or corrosive fluid applications.

NAPCO rotary gear pumps are positive displacement pumps. As the rotary impeller turns, the gear teeth open, creating an expanding cavity on the inlet side to vacuum fluid into the pump chamber. The impellers carry the product around the pump cavity to the outlet side and, upon meshing on the outlet side, force the fluid out of the pump.

The drive gear and idler gear are the only moving parts in the pump. The outer lip seals (low pressure) and inner seals (high pressure) ride on especially hardened shaft surfaces. The four inner high pressure seals seal the pump chamber and the four outer lip seals create lubrication chambers. The two shafts ride on four outboard roller bearings –one on each shaft end– that are spatially separated from the seals and pump chamber by weep holes in the bearing housings/side covers. Anti-cavitation traps on the inside walls of the bearing housings/side covers minimize shaft flex that would otherwise result from product being trapped between the meshing gears. The discharge ports are designed to allow the gears to rotate and move product in either direction through the pump chamber.

PUMPS CAPACITIES AND SIZES

NAPCO rotary gear pumps come in 2” and 3” discharge port sizes and handle volume capacities ranging from approximately 60 to 350 GPM. They are designed to generally operate up to 300 RPM yielding pressures up to 100 psi. Running at speeds higher than 300 RPM will accelerate wear. Consult with NAPCO if operating pressures in excess of 150 psi are expected. Where the design application calls for pumping an abrasive product, increasing the NAPCO pump size and decreasing the pump speed is the most likely way to increase pump performance.

GEAR PUMP CAPABILITIES

NAPCO rotary gear pumps are designed to pump viscous and abrasive fluids and some corrosive fluids. The closely machined tolerances between the operating surfaces allow them to efficiently pump non-viscous fluids as well. The pumps can operate equally well in a clockwise or counter-clockwise rotation of the gears, and with the drive gear in the upper or lower chamber position.

APPLICATION

• high viscous products
• product transfer
• explosive product slurries
• glues and adhesives manufacture
• laminates, plywood manufacture
• oilfield and refinery products
• marine bilge and salt water pumping
• pulp and paper slurries
• corrosive chemical product pumping
• metered discharge requirements

ENGINEERING AND PERFORMANCE DATA

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PERFORMANCE DATA

The following pump data was tested with water (specific gravity 1.0). Consult NAPCO for specific pump size and speed recommendations for your application. Higher viscosity liquid products may require a lower pump RPM to achieve the desired GPM and discharge pressures.

PUMP RPM	DISCHARGE PRESSURE	CAPACITY GPM	BRAKE HP
ALL	ALL	2″	3″	2″	3″
190	10	69	104	.65	.98
190	30	65	97	1.8	2.7
190	50	64	95	3.2	4.5
190	70	62	93	4.0	6.2
190	100	60	89	5.7	8.4
280	10	105	158	.99	1.5
280	30	98	147	2.7	4.2
280	50	97	145	4.7	6.9
280	70	95	142	6.3	9.4
280	100	93	140	8.7	13.4

MATERIALS & COMPOSITION

NAPCO rotary gear pumps are available in ductile iron and 316 stainless steel and come standard with high temperature nitrile rubber gears good for operating temperatures up to 240 degrees Fahrenheit. Where higher temperatures or corrosive fluid conditions are to be encountered, NAPCO can work with its customers to provide gear material out of various metals and elastomers, such as neoprene, EPDM, urethane and viton. Please check with NAPCO or your local distributor as to the suitable gear and pump case for your particular product application. For further information on the material composition of NAPCO pump parts, see Section “Pump Materials and Composition” below.

Material	Shaft	Impeller	Housing	Center Case Gasket	High Presure Seal	low Presure Seal	Bearings
Ductile Iron	Alloy Steel	Nitrile Rubber	Carbon Steel	Asbestos-free paper	Viton / Teflon	Viton	Chrome Needle
316 Stainless	440C Stainless	Nitrile Rubber	316 Stainless	Asbestos-free paper	Viton / Teflon	Viton	Chrome Needle

DIMENSIONAL DATA

	A	B	C	D	E	F	G	H	I	J	K	L
2″	4.25	6.25	8.38	12.75	6.63	3.63	4.625	2.0	4.0	12.0	1.125	4.50
3″	4.37	6.25	8.38	12.75	6.63	3.63	4.625	1.187	6.0	14.0	1.125	4.50

IDENTIFICATION CHART

In addition to the NAPCO Spare Part Repair Kits and Gear Assemblies discussed above, a customer may also order specific spare parts from NAPCO. Please consult the blow-out diagram below to identify the specific part needed, including name and identification number. Many parts are available in ductile iron or stainless steel material. Ductile iron parts have a “C” letter in their part number. Stainless steel parts have an “S” letter in their part number.

DESCRIPTION	PART NUMBER	REFERENCE NUMBER	NUMBER PER PUMP
3″ PUMP	PA300C or PA300S
3″ Service Kit	PK300C or PK300S
Idler Shaft	PM304C or PM304S	4	1
Drive Shaft	PM303C or PM303S	3	1
Pump Housing 3″	PM0301C or PM0301S	1	1
Driver Gear 3″	PM306N	9	1
Idler Gear 3″	PM306N	9	1
Port Bolt	5/8-11 x 1.5″ hex bolt C or S	16	4
Port Gasket	PB316	14	2
2″ PUMP	PA200C or PA200S
2″ Service Kit	PK200C or PK200S
Idler Shaft	PM204C or PM204S	4	1
Drive Shaft	PM203C or PM203S	3	1
Pump Housing 2″	PM0201C or PM0201S	1
Driver Gear 2″	PM206N	9	1
Idler Gear 2″	PM206N	9	1
Port Bolt	5/8-11 x 1.5″ hex bolt C or S	16	4
Port Gasket	PB216	14	2
COMMON PARTS
Bearing Housing/Side COver	PM002C or S	2	2
Set Screw	NAP- 1/4-2.8 x .5snss	5	2
Gasket .016″	PM007G02	7	4
Gasket .008″	PM007G01	7	3
Roller Bearing	PM038	8	4
Seal Low Pressure	PM037	10	4
Seal High Pressure	PM036	11	4
Side Cover Bolt	3/8-16 x 1.25″ hex bolt C or S	17	24
Grease Nipple ss	H1610S	18	8
Aligning Pin	PM42	19	2
O-ring	PB43	25	4
Backing Washer	PM226	27	4

Contact Us

NAPCO Pump Company
8744 S. Sandy Parkway, Unit E
Sandy, Utah 84070