Shop 3L Series Air-Driven Liquid Pumps

Hydraulics International, Inc. (HII) air driven liquid pumps operate on the principle of differential working areas. An air piston drives a smaller diameter plunger or piston to provide a pressure ratio. The pressure ratio is the method of determining maximum outlet pressure available. Hydraulics International model numbers

reflect the nominal pressure ratio of the pumps.

Hydraulics International liquid pumps operate at a drive air pressure of 12-150 psi (0.8-10 Bar) and will cycle automatically when compressed air is first applied to the drive. It will start cycling at its maximum speed thus producing maximum fluid flow. At this stage, the pump is acting as a transfer pump, filling the pressure system with fluid. As resistance increases in the system (creating back-pressure to the pump), the pump will decrease its reciprocating action. Back-pressure in the system

finally balances with the incoming air drive pressure times the ratio. At this point, the pump will stall and maintain pressure without consuming any energy. If there is further demand on the system for flow, the pump will automatically start cycling again.

Style:

Max Outlet Pressure:

Volume Displacement per Cycle:

Liquid Port Inlet:

Liquid Port Outlet:

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3" Single Acting, Single Air Drive

1200psi to 15,000psi

0.03in3 to 0.82 in3

3/8" NPT to 3/4" NPT

1/2" NPT, to 1/4" Super Pressure Threaded and Coned

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Click HERE to view the Entire 3L Air-Driven Liquid Pump Collection

Shop All 3L Series Air-Driven Pumps

Click on the model number in the chart below to view that item. Options show below are most common and readily available.

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Product SKU	Max Outlet Pressure	Displacement (in3)	Inlet Port	Outlet Port	Material	Lead Time	Price
3L-SS-8	1,200	13.44	3/4" NPT	1/2" NPT	316SS Hydraulic Body, 316SS Hydraulic Plunger, 316SS Check Valves, Buna-N Static O-Rings, UHMWPE Plunger Seal	2-3 Weeks	$899.99
3L-SS-14	1,950	7.54	3/4" NPT	1/2" NPT	316SS Hydraulic Body, 316SS Hydraulic Plunger, 316SS Check Valves, Buna-N Static O-Rings, UHMWPE Plunger Seal	Same Day	$1,026.99
3L-SS-25	3,750	4.1	3/8" NPT	1/4" NPT	316SS Hydraulic Body, 316SS Hydraulic Plunger, 316SS Check Valves, Buna-N Static O-Rings, UHMWPE Plunger Seal	2-3 Weeks	$697.99
3L-SS-41	6,150	2.46	3/8" NPT	1/4" NPT	316SS Hydraulic Body, 316SS Hydraulic Plunger, 316SS Check Valves, Buna-N Static O-Rings, UHMWPE Plunger Seal	2-3 Weeks	$929.99
3L-SS-81	12,150	1.31	3/8" NPT	1/4" NPT	316SS Hydraulic Body, 316SS Hydraulic Plunger, 316SS Check Valves, Buna-N Static O-Rings, UHMWPE Plunger Seal	2-3 Weeks	$650.99
3L-SS-125	15,000	0.82	3/8" NPT	1/4" NPT	15-5 PH Hydraulic Body, 316SS Hydraulic Plunger, 316SS Check Valves, Buna-N Static O-Rings, UHMWPE Plunger Seal	Same Day	$601.80
3L-SS-220	15,000	0.49	3/8" NPT	1/4" SP	15-5 PH Hydraulic Body, 15-5 PH Hydraulic Plunger, 15-5 PH Check Valves, Buna-N Static O-Rings, UHMWPE Plunger Seal	2-3 Weeks	$638.07