Lpg Products

When the pressures or capacities of your application are beyond the capabilities of our vertical compressors, Corken’s horizontal compressors are your next option. Unlike Corken’s vertical reciprocating compressors, the horizontal compressor uses a segmented packing design to seal the piston rod.

Depending on the pressure requirements of your application, we offer single- or two-stage design in a lubricated, non-lubricated, single or double-acting configuration. Each style has different options for the piston rod packing and distance piece. The style of the compressor required depends on the demands of your application. If oil-free gas and leakage containment are not critical, then a plain style is right for you. Most propane, butane and agricultural ammonia applications only require a plain style compressor. In contrast if oil-free gas and leakage containment are a high priority, then a T-Style oil-free compressor is the best choice.

Each product group below is designed for a specific level of leakage containment. To find a compression solutoin for your application, select from one of the product groups listed below.

Plain Style Reciprocating Compressors

  • Plain style horizontal compressors utilize one set of segmented packing per piston rod and do not have a distance piece
  • Plain style configurations are not oil free
  • Typically used in non-toxic, non-corrosive applications where oil-free gas is not required and leakage containment is not critical
  • If oil-free gas compression is required, a T-Style horizontal compressor is recommended

Operating Specifications

  • Maximum piston displacement: 414 cfm (704 m3/hr)
  • Maximum working pressure: 1,650 psi (113.8 bar g)
  • Maximum brake horsepower: 75 hp (55.9 kW)
  • Maximum outlet temperature: 350 °F (177 °C)

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T-Style Oil-Free Reciprocating Compressors

  • T-style horizontal compressors utilize three sets of segmented packing per packing rod and two (double) distance pieces
  • The inner oil wiper rings and oil deflector ring prevent oil carryover
  • All T-style horizontal compressors deliver oil-free gas compression
  • Typically used in toxic and corrosive applications where oil-free gas and maximum leakage containment are criticalOperating Specifications
  • Maximum piston displacement: 414 cfm (704 m3/hr)
  • Maximum working pressure: 1,650 psi (113.8 bar g)
  • Maximum brake horsepower: 75 hp (55.9 kW)
  • Maximum outlet temperature: 350 °F (177 °C)

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Corken’s side channel pump is a unique self-priming pumping technology. The design of a side-channel pump is similar to a regenerative turbine pump in that the impeller makes regenerative passes through the liquid. However, the actual design of the impeller and casing, and principles of operation differ greatly. Unlike other pump designs, the side channel pump can accommodate the transfer of liquid and gas mixtures with up to 50% entraIned gas. This feature greatly reduces the possibility air or vapor locking that can occur in other pump designs. A special suction impeller lowers the NPSH requirement for the pump. We offer several models of side channel pumps for wide range of differential pressures and capacities. The SC model side channel pumps are available with mechanical seal option only. Ideal for high differential pressure applications involving LPG (propane & butane), agricultural ammonia, natural gas liquid (NGLs) and many more.

SC-Model Side Channel Pump

  • Mechanically sealed design
  • Available with several seal types and a wide variety of seal face/seal seat materials
  • Ideal for low net positive suction head (NPSH) and high differential pressure applications
  • Available with ANSI flange connections only
  • Single or double seals available


  • Operating Specifications

    • Flow rates up to 185 gpm (700 l/min)
    • Working pressures up to 580 psi (40 bar)
    • Differential pressures up to 250 psi (17.2 bar)
    • Temperature range: -40 to 428 °F (-40 to 220 °C)
    • Viscosities up to 1,050 SSU (230 cSt)

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Horizontal LPG Compressors

Corken’s horizontal compressors offer the largest capacity in liquid transfer. They are used to unload LPG marine barges, which typically are not equipped with on-board transfer equipment. These compressors are also used to recovery both liquid and vapor from the containers after the liquid transfer operation is completed. The horizontal compressors provide a full range of capacities from 600 to 1,725 gpm (137.5 to 391.7 m3/hr) in liquid transfer. Horizontal Compressors


  • Modular construction
  • Low vibration design
  • Heavy duty cylinder design
  • Self-lubricating piston and rider rings
  • Simple to service


Engineered Packages

Custom-engineered skid-mounted units can be supplied with control panels, wiring, receiver tanks and other special accessories as required.

Vertical Compressor

F291 Compressor

Compressors are extremely versatile for they can be used to transfer liquids between tanks, off-load/load out liquids, recover residual vapor, and evacuate vapors for maintenance purposes. Many LPG piping systems do not provide ideal NPSH conditions for liquid pumps which causes excessive pump maintenance. Since compressors are only exposed to vapors, they are not affected by poor NPSH conditions. Many LPG pressurized tanks such as railcars and buried tanks have top unloading connections. A compressor can be the perfect solution for transferring liquids to and from such tanks.


  • Threaded and ANSI flanges
  • Oil-free design
  • Self-lubricating PTFE1 step-cut piston rings
  • Packing adjustment screw in most models
  • Ductile iron construction
  • Positively locked piston
  • O-ring head gaskets
  • High-efficiency valves

D891 Double Acting CompressorServicability
Corken compressors are designed to minimize required maintenance and make such maintenance extremely simple. Valve replacement may be accomplished without disturbing the piping and ring replacement may be accomplished by simply removing the head.

The same compressor installed for one application can easily be piped to be utilized for other plant applications. An example would be a railcar-unloading, in which the compressor can also be utilized to load and unload trucks.

Truck Compressor Applications
Corken’s LPG compressors have an extended crankshaft option for utilization on trucks with PTO and hydraulic drive systems. The compressor can be utilized for loading/ unloading as well as vapor recovery on trucks.

B166 (3/4″ and 1″) Automatic Dual Purpose, Bypass Valveshttp://corken.com/media/images/valve_b166.jpg

Used with all cylinder filling pumps. (Coro-Flo Models and low flow side channel pumps)

The B166B is a combination bypass and priming valve specifically designed for small cylinder filling type pumps, especially of the regenerative turbine type, such as the Coro-Flo pump series. The vapor elimination system keeps liquefied gas pumps primed to increase system reliability and decrease pump and seal wear. The B166B is a smooth operating bypass with moderate pressure buildup.



T166 (1-1/4″ and 1-1/2″) Pump Flow Control Valve

Used with large capacity pumps filling various sizes of tanks and bottles such as those used with delivery trucks or multi-spot cylinder-filling plants.

The T166 valve provides smooth-acting flow control. Specifically designed for bypass protection for pumps in the 30–100 GPM (6.8–22.7 m3/hr) range, such as those used on delivery trucks. In contrast to the B177, the T166 valve opens gradually as pressure builds up to modulate the flow, bypassing the excess capacity smoothly and silently back to the supply tank. A continuous internal bleed in this valve assists in eliminating vapors.



B177 (2″ and 2-1/2″) Differential Bypass ValveB177 Bypass Valve

Used in liquefied-gas bulk plant installations for the loading and unloading pumps.

The B177 is a low-pressure buildup valve specifically designed for applications requiring protection for positive displacement pumps in the 50–350 GPM (11.4–79.5 m3/hr) for smooth-acting flow control. To properly function, this valve requires a pressure sensing line for the storage tank. This valve should be applied where horsepower is limited and accuracy set points and flow points are necessary.

Coro-Vane Truck PumpsThe Z-Series Coro-Vane® truck pumps are specifically designed to perform in such severe operating conditions as high differential pressure, pump overspeeding, poor suction conditions and heavy thrust loads associated with a power take-off (PTO) drive system.


  • Innovative cam design virtually eliminates cavitation
  • New materials utilized in cam and blades extend pump life
  • Large diameter non-metallic pins are suitable for higher pump speeds
  • Locked rotor is factory set with shim adjusted thrust bearings which are rated in excess of 4,000 lb



Z-Series Z3500 Stationary and Truck Pump

 Z3500 Overview

Z3500 Overview

Save time and money with higher flow rates—faster loading and unloading!

The new three-inch Z3500 LPG pump is designed for stationary and foot mounted truck applications. The Z3500 stationary pump has the same locked rotor design used in the Corken Z-Series truck pumps to ensure long pump life and excellent performance. With higher flow rates than other three-inch pumps, the Z3500 retrofits Corken’s and other competitive pumps with little or no change in piping.


Z-Series Z3500 Stationary and Truck Pump

 Z4500 Overview

Z4500 Overview

Higher capacities shorten fill times for transports and multiple bobtail loading

The Z4500 is a four-inch stationary pump designed for transport loading and multiple bobtail loading applications. If you have two or more bulkheads to load bobtails and transports and would like to shorten your fill times, then the Z4500 is the stationary pump for you. The Z4500 can fill two 3,000 gallon bobtails in 20 minutes or less at typical operating RPMs.

SC-Series Side Channel Pumps are typically used for cylinder filling, vaporizer feeding, pumping from underground storage and bulk filling operations.

For those LPG applications where high-differential pressure is necessary or low NPSH conditions exist, such as pumping from underground tanks, the SC-Series multistage side-channel is the pump of choice.

The side channel pump is offered in six different sizes, each ranging from one to eight stages. This provides for a wide range of pressures, capacities, and liquid transfer rates.

The Corken SC-Series pump line utilizes an integral centrifugal and side channel design to create flow characteristics which enable the pump to handle up to 50% vapor and low NPSH conditions. The multi-stage modular side channel design which features one to eight open radial-vane impellers is capable of building differential pressures of over 200 psi (14 bar).

Side Channel Pump

Corken Coro-Vane® pumps are positive displacement pumps. They produce a maximum differential pressure of 125 psig (8.6 bar g). Corken manufactures four sizes of Coro-Vane pumps, ranging from 1gpm to 350 gpm (0.2–79.5 m3/hr). Corken offers these pumps with v-belt or direct-drive mounting options.Coro-Vane Pump

Typical applications for the Coro-Vane® pump include cylinder filling, loading and unloading of bulk trucks and transport trailers.

Long Life and Ease of Maintenance
The pump housing and rotors are constructed of ductile iron for extra strength and long life. The sliding vanes are self-adjusting which allows for longer life and higher efficiencies throughout the life of the pump. The pump design includes removable pump casing cams (liners) which when worn can be replaced in minutes. The seal and bearings can be replaced in minutes by simply removing four bolts. Some of the models are equipped with an internal relief valve.

Coro-Vane Pump with V-Belt Drive and MotorMounting Options
Corken offers the option of belt drive or gear drive with reducer. The Coro-Vane® stationary pumps are designed to run up to 950 RPM. The C51/F51 bottle filling Coro-Vane pumps are designed to run at 1800 RPM.

The Coro-Flo® pump is offered in three different model drive configurations. The C-Model configuration has the pump close coupled to a motor (shown below). The F-Model has a separate pump body and is directly driven through a coupling. And finally, the DS/DL Model pumps are mounted on a special bracket which will accept standard C-face motors.

C-Model Coro-FloDesigned specifically for LPG, the
C-Modelpump is extremely quiet and free of vibration and pulsation and provides trouble free service and long life for volatile liquids such as LPG. The one moving part, the impeller, floats on the shaft without contacting adjacent surfaces, thus extending pump life. All Coro-Flo® pumps are listed by Underwriters’ Laboratories, Inc. for LP-Gas and anhydrous ammonia service.

F-Model Pump Mounted with Coupling and Motor
The F-Modelpump is the base plate mounted version. Coro-Flo® pumps are design to operate at shaft speeds between 2880—3600 rpm. The F-Model provides the flexibility of motor selection.


DS-DL-Direct Mounted Pump with Motor

The DS/DL Model pumps are designed to eliminate the need for a baseplate, coupling guard, and coupling alignment which makes the DS/DL series pumps compact and easy to install. The special bracket supports both the pump and the motor so they can be directly coupled.


Flanged Pump Model
The Coro-Flo® pumps have an option of ANSI flange connectionson all of the various sizes and model types.

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