Compressi on systems
FLeXiBLe FUeL HeADer
This simple design just makes good sense and saves money. By providing easy access, our new
flexible fuel header lets you maintain fuel valves, and even replace them, in a matter of minutes,
rather than hours. As an added benefit, the system relieves much of the assembly stress from the
gas injection valves.
Gas Engine Compressors
Exciting New Ajax Engineering Evolutions
eLeCtroniC GoVerninG system
Ajax engineering comes through in another big way with our Integrated Governor Throttle Body,
now standard equipment. The IGTB provides excellent speed stability and quick response to load
changes. The governor measures engine speed with a magnetic pickup and automatically adjusts
fuel gas header pressure as required to maintain desired speed. The IGTB offers the features of
simplicity without the requirement for on-site tuning.
oXiDiZinG CAtALytiC ConVerter
Many have tried, but only Ajax delivers a highly successful, field-proven catalytic converter to meet
the new environmental guidelines for two-stroke low-emission gas engines. Designed to alleviate the
potential worries of oil contamination and pressure spikes, this new product improvement virtually
eliminates CO and VOC emissions and greatly reduces formaldehyde emissions. Add this to our
patented expansion chamber, and it’s possible to achieve any combination of these benefits, including
reduced NOx and/or increased site horsepower ratings.
tUneD eXHAUst eXpAnsion CHAmBer
Because ever-tightening environmental requirements pose such difficult, constant challenges,
our goal is to help you comply without giving up performance. Our patented exhaust expansion
chamber provides perfect proof. Its ingenious design allows you to recover up to 50% BHP
derating, reduce NOx by 60%, or both, depending on your needs. Even better, there are no moving
parts, no computers and no air-fuel ratio controllers, and no maintenance is required.
For even better reliability, we’ve made a sophisticated divider block system standard issue for our
power and compressor cylinders across the line. A solid-state flow monitor provides automatic
low- and no-flow shutdown to prevent damage to the engine in the case of pump failure. With
fewer moving parts, less tubing and only a few pumps required, the system is a model of user-
Integral Gas Engine - Compressors
Hydraulic Fuel injection
For optimum fuel efficiency.
Babbitt sleeve and/or Double row tapered
For maximum horsepower load and
Two-cycle, low-BMEP, chrome-plated with fewer parts
for less maintenance. Port-scavenged, requires neither
inlet nor exhaust valves.
Absorb thrust stresses and prevent contamination of
crankcase lube oil.
splash Lubrication system
No oil pump, filter or cooler required for main
and connecting rod bearings. Sealed from
Solid-state, high-energy capacitor discharge
Standard divider block, force-fed lubrication system
for power and compression cylinders.
Crankshaft and Connecting rods
Closed-die forged in precision dies.
Ribbed, cast-iron construction for durability.
API-Type II extra-length design for ease of
High rod Load and Cylinder
Full-load operation through a variety of
compression ratios up to 6:1 per stage.
Highly efficient Compressor Cylinders
Large gas passages and valve flow areas for high
efficiency. Bores range from 3 to 28 inches (7.62 to
71.1cm) diameter. Pressures to 5500 psig (379 BAR).
Low Valve Velocity
Longer life, high performance and high efficiency.
High-differential poppet valves standard.
Clearance / Loading
Manual, wheelhand-type, variable volume
clearance pocket with indicator allows cylinder
unloading without de-pressurizing.
Compressi on systems
Simplicity reigns supreme with Ajax integral technology.
And improvements are made with one very critical
parameter in mind — never compromise the strength and
simplicity of the original design. That explains why our
integral engine-compressors simply last longer, cost
less to maintain and come standard with features that
meet all the BACT emissions requirements. They also con
sistently maintain an impressive 98% or better availability.
For a life cycle that can easily span 50 years or more, all
that’s required of you is an annual oil change and very few
special tools; as proof, our very first two DPC models,
built in 1958, are still running strong.
Aj ax I nt egr al
Common crankshaft – no coupling
Alignment not required
Lowest mechanical losses
Smooth-running balance – opposed design
Hi gh- Speed Separ abl e
Critical alignment with close tolerances
Higher mechanical losses
Potential engine / compressor mismatch
C O N S I D E R T H E D I F F E R E N C E S
total Cost of ownership
Total Cost (Thousands)
Comparison of a DPC-2802LE Vs. CAT 3408 - Ariel JGA HSSP to the following factors:
1) Initial cost 2) Annual maintenance cost and downtime 3) Natural gas price at $10 MMBtu
Ajax Integral Versus High-speed
Ajax integral engine-compressors are
available from 147 to 845 Hp (110-630 kw)
and are ideally suited for:
• Gas gathering
• Gas transmission
• Gas re-injection
• Gas processing
• Propane processing
• Helium processing
• Coal Bed Methane
A J A X A P P L I C A T I O N S
Less is better when it comes to replace
ment and maintenance of engine parts.
With an AJAX two-cycle engine, you
• Cam, camshafts
• Valve stems and
valve stem bushings
• Valve covers
• Push rods
• Timing gears
• Valve springs
• Rocker arms
• Intake and
T W O - C Y C L E S I M P L I C I T Y
The Ajax Competitive
After nearly 50 years of reliable, efficient, long-lasting
service, Ajax integral engine-compressors continue to earn their
distinguished reputation for being as close to worry-free as any
compressor product in the world. Our product line, from 147 to 845
horsepower (110-630 kw), and a cylinder line-up capable of handling
a wide range of pressures, from vacuum to 5500 psi (379 BAR), offers
up to six ratios capability and the lowest BHP per million flows for a
wider range of applications, including sour gas. Thanks to its unique
two-stroke design, the Ajax integral engine-compressor virtually eliminates
problems typically caused by the presence of sour gas, handling
S content up to 3.0 mol%.
As an Ajax customer, you’re working with pros who
are not only the best in the business, but sincerely devoted to your success.
Our manufacturing team averages 17 years of experience and our Ajax
technical support team, 20. Out of our facility in Oklahoma City, we offer a
complete package designed to all of our customer specifications, including
The smart choice for gas compression service is
Ajax, where top products and services are backed by one of the strongest war
ranty programs in the industry.
pUt tHe eDGe to WorK For yoU.
Top-quality OEM products. Expert advice.
Proven experience. Superior technology. They’re all yours the minute you
choose to put Ajax on your team. If the idea of simplifying your operation
and obtaining greater efficiency sounds good to you, give us a call and let us
show you how to get the edge up on your competition.