Alfa Laval LKH Self-Priming Pumps

The LKH Prime from Alfa Laval is an efficient, versatile, and hygienic self-priming pump. Its design was based on the market-leading LKH family and shares many of the same features. Add in that it can easily and efficiently pump fluids with entrained air, and you have a CIP power house.

The LKH Prime uses advanced design and air screw technology to meet the most stringent requirements commonly found in food, dairy, beverage, home and personal care. These industries insist that pump be versatile and able to perform in the toughest applications.

The LKH Prime is EHEDG and 3-A approved while remaining a cost-effective option for applications where air will be entrained.


  • LKH Prime
  • LKH Prime UltraPure

LKH Prime is available in size 10, 20, and 40, and additional sizes may become available at a later date.


The LKH Prime is a highly efficient self-priming pump, which meets 3-A Sanitary Standards. The ability to evacuate air from the suction pipe—combined with a low noise level and high pumping efficiency—makes the LKH Prime ideal for tank emptying and CIP return applications; and, with verified effective CIP cleanability, LKH Prime can be used as a product pump as well.

Operating principle

On applications where the pumped media contains a mixture of air and liquid in the suction line, air-screw rotation causes the formation of a continuous liquid ring within the canister. Due to the eccentric position of the canister relative to the air-screw, an air chamber forms between the liquid ring and the air-screw, which separates into air pockets between the air-screw vanes.

The continuous rotation of the air-screw forces air pockets through the canister into the suction stage of the impeller; they are then pumped out via the discharge. Liquid is returned from the discharge via the re-circulation pipe into the canister to ensure the liquid ring is maintained at all times. When there is no air present, the canister and recirculation loop have no function and are fully filled with liquid. The liquid passes through the canister into the suction stage of the impeller, allowing the pump to act as a traditional centrifugal pump.

Standard design

Based on the LKH, the LKH Prime is designed to be cleaned in place. Unlike conventional self-priming pumps the LKH Prime has an impeller which can be trimmed for any application.

Shaft seals

The LKH Prime is equipped with either an external single or a double mechanical shaft seal. Both have stationary seal rings made from stainless steel AISI 329 with sealing surface in silicon carbide and rotating seal rings in carbon as standard.

Energy efficient

Using the combination of advanced air-screw technology, optimized impeller, and casing geometry, Alfa Laval LKH Prime exceeds industry expectations for quiet, efficient operation, reduced energy consumption, and CO2 footprint. Alfa Laval LKH Prime is engineered to meet the most stringent standards and hygienic requirements.

Premium Pump Platform

A further addition to the market leading Alfa Laval LKH pump platform, Alfa Laval LKH Prime is characterized by superior performance, high quality and reliability for improved operational productivity.

Meets Global Standards

Quiet in operation, Alfa Laval LKH Prime is engineered to meet the most stringent standards and hygienic requirements.

Easy to Maintain

The pump is easy and cost effective to service and maintain. By sharing common parts with other Alfa Laval LKH range pumps, Alfa Laval LKH Prime offers low cost of ownership and increased uptime, backed up by the security that comes from Alfa Laval’s global service network.


Alfa Laval LKH Prime is a self-priming pump based on air-screw technology. It offers excellent operational efficiency, reducing energy consumption. The pump achieves capacities of up to 308 gpm and pressures of up to 56 psig. The pump shares many common components with the Alfa Laval LKH pump range including the impeller, which can be trimmed to optimize pump performance according to its application. Dedicated components include the airscrew, casing, re-circulation pipe and cover.

Pump Sizing

To correctly size a pump, some essential information is required. Provision of the information listed below enables our customer support personnel to determine the optimum pump selection:

  • Fluid to be pumped
  • Viscosity
  • SG/Density
  • Pumping temperature — minimum, normal, and maximum
  • CIP temperature(s) — minimum, normal, and maximum
Product Wetted Steel Parts316L
Other Steel Parts304
FinishPolished ≤ 32 Ra
Product Wetted SealsEPDM, FPM (Viton), NBR (Buna or Rubber)
Technical Data
Max Inlet Pressure72.5 psi
Temperature Range14°F – 284°F (EPDM)
Water Pressure Inlet (Seal Flush)Max 72.5 psi
Water Consumption (Seal Flush)4 – 8 gph
Pumping Product Motor Speed (No Air)900 – 3600 rpm
Air Evacuation Motor Speed2800 – 3600 rpm

Spare Parts

LKH Prime Shaft Seal Parts
PartLKH Prime 20LKH Prime 40Diagram Key
Tool, Complete96121371019612137101-
Seal Housing9612133904961213390440a
Screw for Seal Housing9611990203961199020341
Drive Ring, Single Shaft Seal961420600196140600110

LKH Prime Parts List

LKH Prime Service Kits
Single, LKH Prime 20C/SIC961192717596119271769611927177
Single, LKH Prime 40C/SIC961192721096119272119611927212
Single, LKH Prime 20SIC/SIC961192717896119271799611927180
Single, LKH Prime 40SIC/SIC961192721396119272149611927215
Double, LKH Prime 20C/SIC961192718196119271829611927183
Double, LKH Prime 40C/SIC961192721696119272179611927218
Double, LKH Prime 20SIC/SIC961192718496119271859611927186
Double, LKH Prime 40SIC/SIC961192721996119272209611927221

LKH Prime Parts List

LKH Prime Seal Kits


Double MechanicalC/SIC961212961396121296149612129615
Double MechanicalSIC/SIC961212963696121296379612129638

LKH Prime Parts List

LKH Prime Motor Dependent Parts
Part3-5 Hp7.5-10 Hp15-20 Hp25-30 Hp40-60 HpDiagram Key
Compression Ring with Thread961213360296121336069612133603961213360396121336045a
Compression Ring w/o Thread961213370296121337069612133703961213370396121337045b
Shaft LKH Prime 20961523040796152304089615230409N/AN/A7
Shaft LKH Prime 40


Stud Bolt961523030196152303019615230301N/AN/A7a
Connex Pin961199062296119906229611990622961199062296119906228
Screw for Adaptor961199441296119944139611994449611994414961199441517
Washer for Adaptor9611994417961199441796119944179611994417961199441819
Safety Guard Set9614077405961407741296140774099614077409961407740922
Leg Bracket481661481663481665481669963405619570

LKH Prime Parts List

LKH Prime Wet End Spare Parts
PartLKH Prime 20

30-20 HP

LKH Prime 40

15-60 HP

Diagram Key
Pump Casing, Mech. Ra ≤ 32, Tri-Clamp9615262002961526200429
Pump Casing, Mech. Ra ≤ 20, Tri-Clamp9615262006961526200829
Front Cover, Mech. Ra ≤ 32, Tri-Clamp9615262102961526210460
Front Cover, Mech. Ra ≤ 20, Tri-Clamp9615262106961526210860
O-Ring, EPDM9615217301961544150159
O-Ring, NBR9615217303961544150359
O-Ring, FPM9615217302961544150259
Recirculation Pipe, Mech. Ra ≤ 329615202004961520200356
Recirculation Pipe, Mech. Ra ≤ 209615202005961520200456
O-Ring, EPDM9615261501961526150155
O-Ring, NBR9615261503961526150355
O-Ring, FPM9615261502961526150255
Clamp Set9611311057961131105857
Air Screw, Mech. Ra ≤ 329615216504961521670358
Air Screw, Mech. Ra ≤ 209615216507961521670458
Cap Nut9611992592961199259324
Spring Washer9611991888961199188724a
O-Ring, EPDM9611992141961199217126
O-Ring, NBR9611992143961199217326
O-Ring, FPM9611992142961199217226
Impeller, Mech. Ra ≤ 329612131418961213181637
Impeller, Mech. Ra ≤ 209612131406961213180637
O-Ring, EPDM9611992145961199214538
O-Ring, NBR9611992147961199214738
O-Ring, FPM9611992146961199214638
Back Plate, Mech. Ra ≤ 329612138421961213842225
Back Plate, Mech. Ra ≤ 209612138435961213843825

LKH Prime Parts List

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