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Home / Gear Pumps / 3-Series

Guide to Gear Pumps
An Introduction to Gear Pumps

Gear Pump Basics (pdf)

Metering with Gear Pumps (pdf)

Questions?
Contact us for your application needs

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

The 3-Series Gear Pumps have been replaced by the H-Series gear pump line. The H-Series is recommended for all new applications as well as an upgrade to any existing 3-Series installations.

Liquiflo's original 3-Series gear pumps are available in Sealed and Mag-Drive versions with flows up to approximately 55 GPM and differential pressures up to 100 PSI.


Models 31-39 Sealed	Models 31-39 Mag-Drive	Models 312-314 Sealed
Close-Coupled	Close-Coupled	Long-Coupled, Bare Pump


Models 312-314 Mag-Drive	Models 31-39 Sealed	Models 312-314 Sealed
Long-Coupled, Bare Pump	Long-Coupled, Base Mounted *	Long-Coupled, Base Mounted *

* Sealed pump shown long-coupled to motor; assembly includes coupling guard (not shown).

3-Series Specifications

Click any Model # below to access page for that individual model:

3-SERIES MODEL		31F	33F	35R	35F	37R	37F	39R	39F	312R	312F	314F
Port Connections: NPT/BSPT ANSI 150# RF FLG DIN PN16 RF FLG	in in mm	1/4 1/2 10	1/4 1/2 10	1/2 1/2 15	1/2 1/2 15	3/4 3/4 20	3/4 3/4 20	1 1 25	1 ¼ 1 ¼ 32	1 ¼ 1 ½ 40	1 ¼ 1 ½ 40	- 2½ 65
Max Flow Rate	GPM	0.5	1.4	2.4	3.4	8.6	10.7	15	21.5	22	29	58
Max Diffferential Pressure	PSI	100	100	100	100	100	100	100	100	100	100	100
Max Discharge Pressure	PSIG	300	300	300	300	225	225	225	225	270	270	270
Max Temperature	°F	500	500	500	500	500	500	500	500	500	500	500
Min Temperature	°F	-40	-40	-40	-40	-40	-40	-40	-40	-40	-40	-40
Max Speed	RPM	1750	1750	1750	1750	1750	1750	1750	1750	1150	1150	1150
NPSHR @ Max Speed	ft (a)	3	2	2	2	5.2	5.2	4	3	5	5	5
Weight (without motor) Sealed, Long-Coupled Sealed, Close-Coupled Mag, Close-Coupled Mag, Long-Coupled	lbs	2.5 23 31 -	2.5 23 31 -	3.5 24 32 -	3.5 24 32 -	6.5 29 36 -	6.5 29 36 -	8 34 38 -	10 36 40 -	52 - - 70	52 - - 70	67 - - 85


	NPSHR = Net Positive Suction Head Required Note: Model 311F has been replaced by Model H9F. The performance curves for Model 311F are located in the Documentation section. Contact factory for additional information.

Available Materials Of Construction

Available Sealing Configurations

	Magnetically Coupled (sealless) The magnetically coupled or mag-drive pump is the best method for handling toxic, noxious, crystallizing, or most other hazardous liquids since it completely contains the pumpage by isolating the drive shaft inside the pump housing. With no dynamic seal to leak or replace, the maintenance issues associated with seal leakage are eliminated. All Liquiflo gear pumps are available with magnetic drive.

	Mechanical Seal Mechanical seals are offered in single, double and external configurations and are used for chemical applications where leakage needs to be minimized or eliminated. The single internal mechanical seal is the most common seal type and is ideal for pumping clean liquids up to 5,000 cP viscosity. The double mechanical seal requires a flushing system and is typically used when pumping liquids that are viscous, abrasive, crystalize on contact with air or are very hazardous. The external mechanical seal is used to isolate the seal body from the pumpage or when pumping liquids under vacuum conditions. Carbon vs. SiC seal faces are the primary choice for most applications up to 500 °F. SiC vs. SiC seal faces have high abrasion resistance and can be applied up to 500 °F. Teflon vs. SiC seal faces have extreme chemical resistance and can be applied up to 180 °F and 50 PSI differential pressure.

	Packing Seal Packing is the simplest and most economical solution for pumping non-hazardous liquids where minor leakage is acceptable. Braided Teflon packing is the primary choice for applications up to 350 °F. Graphoil packing is available for high temperature applications up to 500 °F.

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.)		Close-Coupled Configuration All Liquiflo gear pumps are available with the close-coupled configuration. This configuration simplifies installation and maintenance, and extends pump life by guaranteeing perfect pump-motor alignment.
	Raised-Face Flanges ANSI, DIN, and JIS Flanges are available to simplify piping connections and disconnections.		Sanitary Fittings Tri-clamp sanitary fittings are a convenient alternative to threaded or flanged port connections.
	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).		Power Frame The LIQUIFLO power frame is used for long-coupling mag-drive pumps that are used for high temperature applications, up to the pump's maximum temperature rating. Its integral cooling jacket keeps the bearing system of the pedestal cool even when it is coupled to a pump operating at extremely high temperature.
	Clamp-On Temperature Control Jacket Temperature Control Jackets can maintain the pump at either elevated or reduced temperatures. They are commonly used when pumping liquids that solidify or become difficult to pump when the temperature decreases.		Dual-Kan™ Liquiflo's patented Dual Kan controls the back-end temperature of a mag-drive pump by circulating a heating or a cooling fluid through the containment can. This is ideal for applications requiring precise and uniform temperature control.
	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.		Hard-Coated Shafts Hard-coated shafts are used to extend pump life in difficult applications requiring higher levels of wear resistance. Ceramic Chrome Oxide (CO) and Tungsten Carbide (TC) coatings are available.
	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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