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Guide to Gear Pumps
An Introduction to Gear Pumps

Gear Pump Basics (pdf)

Metering with Gear Pumps (pdf)

Poly-Guard Illustration (pdf)

Poly-Guard Brochure (pdf)

Poly-Guard Specifications (pdf)


Questions?
Contact us for your application needs

Special Requirements?
Liquiflo can custom engineer pumps to meet the specific requirements of your application

 

 

 

 
 
The Poly-Guard® Series External Gear Pump has a rugged Stainless Steel body lined with a chemically-resistant fluoropolymer and contains all non-metallic internal components. This makes the Poly-Guard an excellent choice for pumping highly corrosive inorganic acids, alkalis and salts, as well as for high-purity services, where contact with metallic components must be avoided. The Poly-Guard is available in 9 sizes with capacities ranging from 1.4 to 25 GPM.  
 
 
 
Models P1 thru P4
Models P5 thru P9
Mag-Drive, Close-Coupled
Mag-Drive, Close-Coupled
 
 
 
P-Series Specifications Click any Model # below to access page for that individual model:
  P-SERIES MODEL   P1 P2 P3 P4 P5 P6 P7 P8 P9  
  Port Connections:
  ANSI 150# RF FLG
  DIN PN16 RF FLG


in
mm
3/4
20
3/4
20
3/4
20
3/4
20
1 ½
40
1 ½
40
1 ½
40
1 ½
40
1 ½
40		  
 
Max Flow Rate *
GPM
 1.4 2.3 3.1 4.9 8.5 11.3 14.2 18.8 25.0  
  Max Differential
Pressure
PSI
 100 100 100 100 100 100 100 100 80  
 
Max Discharge
Pressure **
PSIG
 275 275 275 275 275 275 275 275 275  
  Max Temperature
°F
 200 200 200 200 200 200 200 200 200  
 
Min Temperature
°F
 32 32 32 32 32 32 32 32 32  
  Max Speed
RPM
 1750 1750 1750 1750 1750 1750 1750 1750 1750  
 
NPSHR @ Max Speed
ft (a)
 2.0 2.0 2.0 3.0 5.2 5.2 4.0 3.0 3.0  
  Weight (without motor)
  Mag, Close-Coupled
lbs
 42 42 42 42 63 63 63 70 70  

  * Typical Flow Rate @ 1750 RPM and 0 PSI (bar) Differential Pressure.
  ** Flange Pressure derating is required above 100°F.

  RF FLG = Raised Face Flanges (Current P-Series Pumps have Universal ANSI/DIN Flanges, as shown above.)
  NPSHR = Net Positive Suction Head Required
 
 
 
 

Available Materials Of Construction  
 
COMPONENT MATERIALS
Housings 316 Stainless Steel/PFA-Lined
Containment Can 304L Stainless Steel/PTFE-Lined 1
Inner Magnet SmCo/Carbon Steel/PFA-Lined
Gears PEEK 3 or Kynar (PVDF) 4
Keys 2 PEEK 3 or Kynar (PVDF) 4
Wear Plates Carbon-60 5 or Silicon Carbide 6
Bearings Carbon-60 5 or Silicon Carbide 6
Bearing Pins Teflon (PTFE) 7
Shafts Silicon Carbide 6
O-Rings EPDM 8, Viton 9 or Kalrez (FFKM) 10

1 - Obsolete Alloy-C/PFA-Lined Containment Can is available for
     Replacement Cartridges in existing pumps.

2 - Key material will match Gear material.

3 - Bearing Grade PEEK (10% Carbon/10% Carbon Fiber/10% PTFE).

4 - FDA Grade (pure PVDF).

5 - Graphite Grade (pure Graphite).

6 - Self-Sintered Grade (pure SiC).

7 - Pure PTFE.

8 - EPDM Elastomer (Sulfur-free).

9 - FKM Elastomer (Viton Type A).

10 - FFKM Elastomer (Kalrez 4079 or equivalent grade).



 
Available Options & Accessories  
 
Replacement Cartridge
A cartridge is a complete mag-drive pump less the outer magnet and pedestal. A cartridge replacement is a convenient way to quickly replace a mag-drive pump that requires maintenance, ensuring maximum uptime.		 Relief Valves
Positive displacement pumps should be installed with a relief valve in the discharge line to protect the pump and piping against any type of line blockage including the inadvertent closing of an isolation valve. Liquiflo manufactures two sizes of relief valves in both 316 SS and Alloy-C.
Repair Kits
Repair Kits simplify inventory and speed repair. All parts can also be purchased separately. (See also Replacement Cartridge for even quicker repairs.)

S-Adapter
The S-Adapter is available for long-coupling mag-drive pumps; it isolates the pump from the motor and can be used when long-coupling pumps to motors or drives that do not have a C-face mounting. Maximum temperature rating is 250°F (120°C).
Base Plate Mounting
Liquiflo gear pumps are available with base-mounts to simplify installation. Liquiflo also offers base-mounts with or without the motor pre-installed.

Accessories & Spare Parts
Mechanical couplings, coupling guards, risers, base plates, adapters, brackets, pedestals and individual pump components can all be purchased separately.
 
 

 






















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