Rotary Piston Pumps

​MD-Kinney’s rotary piston pumps are known for being some of the most rugged, reliable equipment capable of handling especially dirty processes. MD-Kinney provides a 30-month warranty on all rotary piston pump models.

KT Single-Stage Rotary Piston Pump

  • High pumping capacity at high and low pressures
  • Triplex piston design: dynamically balanced and practically vibration free
  • No metal-to-metal contact between pump piston and cylinder – clearances are filled with oil
  • Quiet running

KT models include an integral, positive pressure lubrication system to insure reliable lubrication at all pressure levels. KT pumps are water-cooled. Optional air-cooling systems are available. Adjustable gas ballast valves are standard for handling water and other vapor loads.

ModelCFM / m3/hHP / kW|Typical Applications
KT-150C150 / 2557.5 / 6|Heat Treating
KT-300D300 / 51015 / 11|Coating
KT-500D500 / 85030 / 22|Transformer Drying
KT-850D778 / 132240 / 30|Metallurgy

KC and KTC Two-Stage Rotary Piston Pumps

  • Recommended for applications where operating pressure is below 0.1 Torr (0.13 mbar)
  • Achieve lowest possible pressures from mechanical pumps
  • No metal-to-metal contact between pump piston & cylinder – clearances are filled with oil
  • Unequaled durability, even in dirty applications

KC & KTC pumps are air-cooled. KTC-112 is water-cooled with optional air-cooling systems. Adjustable gas ballast valves are standard for handling water and other vapor loads. KTC pumps feature triplex piston design: dynamically balanced and practically vibration free.

ModelCFM / m3/hHP / kW|Typical Applications
KC-55 / 8.50.33 / 0.25|Evacuating Refrigeration Systems
Model CFM / m3/h HP / kW
KC-5 5 / 8.5 0.33 / 0.25
8 / 13.60.75 / 0.56|Liquid Gas Storage
KC-1515 / 25.51 / 0.75|Brake Fluid Filling
KTC-2121 / 361.5 / 1.1|Silicon Crystal Growing
KTC-6060 / 1023 / 2.2|
KTC-112107 / 1827.5 / 5.6|

KD and KDH Single-Stage Duplex Rotary Piston Pumps

  • Absolute pressures down to the low micron range
  • Belt-driven, low-speed rotary piston pumps
  • No small orifices to plug up
  • No metal-to-metal contact between pump piston and cylinder – clearances are filled with oil
  • Adjustable gas ballast permits handling of condensible vapors

KD pumps are air-cooled. KDH pumps are water-cooled.

ModelCFM / m3/hHP / kW|Typical Applications
KD-3033 / 561.5 / 1.11|Drying Chambers
KD-5052 / 882 / 1.5|De-gasifiers
KDH-130134 / 2275 / 3.7|Filling Machinery
KDH-150165 / 2807.5 / 5.6|Evacuation of Process

Liquid Ring Vacuum Pumps

Customers can choose a custom or optimized liquid ring vacuum pump from MD-Kinney and install with confidence it will do the job! Lean on our excellent service, support and engineering expertise.

KLRC Two-Stage

  • Can pull down as low as 4 Torr (5.3 mbar a)
  • Low-pressure performance is limited by the vapor pressure of the sealing liquid: water, oil or process liquids
  • Complete engineered system solutions available: instrumentation, controls, piping and valves
  • Self-contained liquid recovery and recirculation are available
  • Center-anchored tie rods allow access to either end of the pump without total disassembly
  • Double mechanical seals available in models KLRC75 through KLRC525 to meet API Piping Plan Requirements

Available in standard, all iron construction (no yellow metals) and 316 stainless steel. Liquid ring pumps often require water-cooling, but air-cooling systems are available.

ModelCFM / m3/hHP / kW|Typical Applications
KLRC-7570 / 1205 / 3.7|Vapor Recovery
KLRC-100100 / 1707.5 / 5.5|Deaeration
KLRC-125140/ 24010 / 7.5|Extruders
KLRC-200200 / 34015 / 11|Crystallizers
KLRC-300300 / 51025 / 18.5|Chemical Processing
KLRC-525550 / 93550 / 37|
KLRC-950950 / 1615100 / 75|

A Series Single-Stage

  • Simplistic in design, rugged in construction – handles even slugs of liquid
  • Unique axial flow design allows pump to operate flooded without damage
  • Built to run in the most severe of industrial conditions
  • Flat power curve over entire vacuum range prevents motor overload
  • No contact between operating components in the casing
  • Pull down to 29” Hg – 25 Torr (33 mbar a)
  • Increased water handling capability prevents heat build-up, extends life of single mechanical seal
  • Reduced stress on motor shaft and bearings
  • Compact, close-coupled design eliminates need for interstage manifold or motor alignment

A Series pumps are not as susceptible to cavitation compared to flat plate design because the flow path through the pump is an axial flow. This allows the velocity through the pump to be unchanged and carries the air out effortlessly. It is not unusual for these pumps to run 24/7 operation for years without maintenance.
Material of construction options include all bronze, cast iron, and stainless steel..

ModelCFM / m3/hHP / kW|Typical Applications
A-510 / 171 / 0.75|Gas Compression
A-1015 / 261.5 / 1.1|Sterilization
A-1522 / 372 / 1.5|Solvent Distillation
A-2035 / 593 / 2.2|Degasifiers
A-7575 / 1285 / 3.7|Extruders
A-100105 / 1787.5 / 5.5|Evaporators
A-130140 / 23810 / 7.5|
A-200220 / 37415 / 11|
A-300300 / 51020 / 15|

Rotary Vane Vacuum Pumps

The KVA’s simple design ensures the reliability and the durability that is required in the vacuum industry. Customers choose MD-Kinney for competitive pricing, local distribution and service, and superior customer service. Engineered-to-order system designs available.

KVA Single Stage

  • Most models can achieve ultimate pressure levels near 0.1 mbar (75 microns)
  • Ideally suited for clean or moderately contaminated applications when suction filters are fitted to the pump
  • Compact design for easy installation
  • Carbon composite vane material for long life
  • Oil-flooded, multi-vane vacuum pumps are single stage, air cooled and direct driven
  • Oil level sight glass and vibration isolators
  • TEFC high efficiency tri-voltage motor (208-230/460V 50/60)
  • Models KVA 25-630 include spin-on oil filter and exhaust pressure gauge
ModelCFM / m3/hHP / kW|Typical Applications
KVA-127 / 12.75 / 0.55|Vacuum Packaging
KVA-2115 / 261.0 / 0.75|Plastic Thermoforming
KVA-2521 / 362.0 / 1.5|Food Processing
KVA-4028 / 482.0 / 1.5|Central Vacuum Systems
KVA-6345 / 783.0 / 2.2|
KVA-10071 / 1205.0 / 3.7|
KVA-160124 / 2107.5 / 5.5|
KVA-250177 / 30010 / 7.5|
KVA-400300 / 50515 / 11
KVA-630460 / 78025 / 18.5|

Vacuum Boosters

Vacuum boosters are used to supercharge vacuum pumps to extend pump performance. This creates much faster pumping speeds and deeper vacuum levels. MD-Kinney’s vacuum boosters are designed to handle the world’s toughest applications.

  • High-capacity gas volumes at high vacuum (50 Torr to micron range)
  • May be used in conjunction with all types of vacuum pumps
  • Designed to operate at 82 dB(A) or less at blank-off (open field; motor and background noise excluded)
  • Supplied with a heavy-duty drive shaft for either direct coupled or belt-driven applications
  • Standard construction materials: cast iron housing, end plates and port fitting with ductile iron rotors and shafts
  • Special materials offered: stainless steel, carbon steel, ductile iron, Bi-Protec
  • Special testing available: Hydrostatic testing to 150 PSIG (10.35 bar g), seal leakage testing, noise testing
ModelCFM / m3/h|ModelCFM / m3/h|Typical Applications
15050-150 / 85- 255|2200860-2300 / 1461-3908|Supercharging Vacuum Systems
24070-230 / 119-391|29001130-3000 / 1920-5097|Vacuum Drying
400120-400 / 204-680|36001400-3600 / 2379-6116|Dehydration
540170-540 / 289-918|45001730-4500 / 2939-7646|Packaging
720230-720 / 391-1223|3200800-3200 / 1359-5437|Distillation
8500-850 / 459-1444|42001000-4200 / 1699-7136|Vacuum Furnace
1200400-1240 / 680-2107|54001400-5700 / 2379-9684|
1600500-1600 / 850-2718|73001800-7400 / 3058-12573|
2000650-2000 / 1104-33984000890-4000 / 1512-6796
2700850-2700 / 1444-458765001400-6400 / 2379-10874
1800680-1800 / 1155-3058|79001800-8000 / 3058-13592|
80002100-9500 / 3568-16141
100002800-10000 / 4757-16990

Dry Screw Vacuum Pumps

Dry screw vacuum pumps are environmentally friendly as there is less oil to dispose of and maintain within their design. These pumps are more efficient than a liquid sealed model and are well suited for industrial and process applications.

KDP Screw-Type Dry Vacuum Pump

  • Simple, robust design can handle process by-products – liquids, condensate, and even small particles
  • No oil or water in contact with process
  • No contact between operating components in the casing
  • Full pumping speed from atmospheric pressure down to 1 Torr; ultimate pressure 0.1 Torr (.05 Torr on Model KDP-800)
  • Quiet operation – less than 85 dB(A)
  • Short gas path through the pump for quick discharge
  • Extended shaft for either V-belt or direct drive
  • Casing and rotors made of ductile iron, PFA coated
60 Hz, Direct Drive
CFM / m3/hHP / kW|50 Hz, Direct Drive
CFM / m3/hHP / kW|Typical Applications
KDP-15088 / 1807.5 / 5.5|KDP-15071 / 1207.5 / 5.5|Solvent Recovery
KDP-330194 / 33015 / 11|KDP-330159 / 27015 / 11|Vapor Recovery
KDP-400235 / 40020 / 15|KDP-400194 / 33020 / 15|Vacuum Coating
KDP-800459 / 78030 / 22|KDP-800388 / 66030 / 22|Freeze Drying

SDV Variable Pitch, Screw-Type Dry Vacuum Pump

  • Patented variable pitch rotor design increases efficiency and lowers temperatures
  • No oil or water in contact with process gases
  • Can handle both condensible vapors and some solids without leaving residue
  • Capable of full pumping speed from atmospheric pressure to 1 Torr (1.3 mbar a)
  • Can achieve ultimate vacuum as low as 0.01 Torr (0.013 mbar a)
  • No metal-to-metal contact between operating parts
  • Complete model shown with motor and base.
  • Quiet operation

The SDV’s space saving C-face motor design eliminates the need for motor coupling and guard. It features a short gas path through the pump for quick discharge and Niflon coated internals to reduce damage from corrosive or condensate gases.

60 Hz, Direct Drive
CFM / m3/hHP / kW|50 Hz, Direct Drive
CFM / m3/hHP / kW|Typical Applications
SDV-12071 / 1205 / 3.7|SDV-12059 / 1005 / 3.7|Chemical Processing
SDV-200106 / 1805 / 3.7|SDV-20088 / 1505 / 3.7|Solvent Recovery
SDV-320188 / 32010 / 7.5|SDV-320157 / 26710 / 7.5|Crystallization
SDV-430253 / 43015 / 11SDV-430211 / 35815 / 11Distillation
SDV-800441 / 75020 / 15|SDV-800368 / 62520 / 15|Vapor Recovery

Engineered Solutions

MD-Kinney Vacuum & Blower Systems offers 100+ years of engineering experience and solid, hands-on care to every engineered project. Customers work directly with a project manager to develop custom solutions that efficiently meet the needs of the application. The engineering team manages the project start to finish at the Springfield, Missouri, USA facility.

Booster/Rotary Piston Vacuum Pumping Systems

  • Pump high volumes at very low pressure
  • High-capacity dry rotary lobe vacuum booster is matched to a smaller rotary piston vacuum pump
  • For continuous operation below 1 Torr (1.3 mbar a), the vacuum booster can increase pumping speed by a factor of 10 or more
  • For operation at higher pressure and for faster evacuations, the booster may be approximately twice the capacity of the piston pump
  • Performance ranges 200-12,000 CFM (340-20,388 m 3 /h) with ultimate vacuum levels as low as 0.2 microns
  • Conventional systems with direct driven or V-belt driven boosters
  • Compact systems with close-coupled boosters are available
  • Creates a higher capacity system with economy of scale

MD-Kinney application engineers can help you make the best selection for your specific needs.

Typical Applications
Transformer Oil Drying
Vacuum Furnaces
Vapor Coating
Vacuum Packaging

Booster/Liquid Ring Vacuum Pumping Systems

  • Ideal for pumping wet gas mixtures at low pressures
  • Oil-filled systems avoid problems with corrosive contaminants and sealant liquid vapor pressures at higher temperatures
  • Process liquid-filled systems prevent contamination of process gases with either water or oil

A variety of two and three-stage systems are available, complete with instrumentation, condensers, partial or complete sealant liquid recovery and recirculation, piping, and valves.

Typical Applications
Vapor Recovery
Chemical Processing
Dryers & Evaporators

Booster/Dry Screw Vacuum Pumping Systems

  • Combine high pumping speed with deep vacuum levels and operate free of oil, water or other sealing liquids
  • Flows range to 4,500 CFM (7646 m 3 /h) with vacuum levels to 10 microns and below

Complete engineered solutions are available and may include any combination of dry screw vacuum pumps, vacuum boosters, electric motors, direct or V-belt drive, coolant recirculation systems, instrumentation, controls, skid piping and valves.

Typical Applications
Chemical & Pharmaceutical Processing
Semiconductor Processing
Solvent Recovery
Dry Etching
Vapor Recovery

Custom Engineered Solutions

MD-Kinney application engineers are ready to help you select the best system and combinations of components for your specific needs. Custom engineered system solutions to 12,000 CFM are available with a combination of vacuum boosters/air ejectors and roughing pumps for any vacuum application. Contact your MD-Kinney rep or call 800-825-6937 for assistance.

Vacuum Pump Selector Guide

Step 1

Vertical Scale: Locate the desired vacuum level in inches of mercury (Torr or mbar*).

Step 2

Horizontal Scale: Calculate and locate the required capacity in cubic feet per minute or cubic meters per hour based on system volume, pump down time, gas load, and leakage.

Step 3

Intersection of Scales: The box where the two lines intersect contains the possible pumps for selected pressure and capacity.


*1 Torr = 1mm mercury absolute pressure

To convert inches of mercury vacuum to Torr:

Torr = (30 – inches of vacuum) x 25.4 at sea level e.g., 20 inches Hg = (30-20) x 25.4 = 254 Torr

Please consult your MD-Kinney sales representative for assistance in making your final product selection.

VBXpert Vacuum & Blower Sizing Tool

Gain access to the most useful tool available for blower sizing and selection! This easy-to-use interface prompts you to plug in technical specifications for your application and quickly calculates the best MD-Kinney product for you. Find out more at

Service & Repair

The MD-Kinney​ CARE Center in Springfield, Missouri, USA is here to help with start-up assistance, repair and warranty work, and remanufactured product sales. Call 1-800-825-6937 to be connected to a MD-Kinney CARE technician. MD-Kinney has a network of authorized CARE Centers offering local service to customers. All centers are staffed with factory-trained personnel to ensure that your equipment performs to factory specifications. A listing of authorized MD-Kinney CARE Centers is available at

Example: For 50 CFM and 80 Torr, the selector guide indicates that KD, KDH, KVA, KLRC, KDP, and SDV pumps should be considered.

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