Expansion Engine

Expansion Engine

Product Details:


Product Description

With a rich experience in this industry, we are affianced in manufacturing, exporting and supplying Expansion Engine. The offered engine is manufactured under the surveillance of our deft technocrats using the quality checked components with the implication of advanced techniques. This engine is highly demanded in various industries like mechanical, automotive industry, etc. for cooling down the temperature of plant. In addition to this, the provided Expansion Engine can be availed from us at the cost effective rates.

Features of Expansion Engine:


  • Robust construction
  • Extended service life
  • Efficient functionality
  • Dimensional accuracy
  • Extended Crankshaft
  • High quality ball valves provided 


Expansion Engine provided by our company, is mainly used for cooling down the plant in a better way. This engine finds its application in mechanical, automotive and other industry. Our provided engine is preferred for its high strength, easy installation, hassle free operation, and excellent long lasting service life. Expansion Engine is that type of engine which is vertical, single acting, reciprocating in nature. Using dry and carbon dioxide free air helps in reducing the cause of having any kind of mal-function, during the working of engine. This engine has three major units: drive unit, cylinder unit and hydraulic system. 

Expansion Engine:

The Expansion Engine is vertical, single acting, reciprocating type. This produces the cold required for the plant. High pressure air enters through inlet valve at the start of downward stroke of the piston  On further downward motion, the inlet valve closes and entrapped Air expands. During upward stroke, outlet valve remains open and inlet valve remains closed.

Therefore, in downward stroke Air enters the cylinder and expands. In the upward stroke the expanded air is pushed outside. The electric motor is used to start the machine. Thereafter the engine is moved by the Air pressure itself and during which time the engine motor retains the speed by acting as a brake. Since work is done by Air in rotating the flywheel, it loses it heat content (enthalpy), thus the Air gets cooled. This cooling is more than that of an expansion in an expansion valve.

An elementary factor for the function of an expansion engine is to use dry and carbon dioxide free air, as otherwise, ice and dry ice will form on valve seats, causing mal-function.

The approx. temperature drop across expansion engine is 50 to 70oC, depending on inlet air pressure, temperature and inlet cam position.

The Expansion Engine consists of three major units:


  • The drive unit
  • The cylinder unit for Air expansion
  • The Hydraulic system for operating the valves


The drive unit is similar to any reciprocating machine with usual parts. Such as crank case, crankshaft, connecting rod, crosshead, etc. The Expansion Engine has an extended crankshaft enabling the accommodation of the cam box. The moving parts are lubricated through a hole in crankshaft. Oil scrapper rings are provided to prevent oil escape to cylinder unit.

The cylinder unit handling the process Air consists of cylinder, piston, inlet and outlet Isolation Valve Assemblies. The Ball valves are actuated mechanically by a Push Rod as per the timing transmitted by the cam. The Push Rods are housed in a stuffing box to avoid Air leakage and are actuated by the Hydraulic system.


  • The Hydraulic system is the control system. The Hydraulic oil is fed by a pump to:
  • Pressurized oil container for valve actuation
  • Lubricate crankshaft and drive and drive unit parts
  • Lubricate the rolled holders


Technical Specifications:
80/100/130 M3/Hr Oxygen Plant
170/200 M3/Hr Oxygen Plant
Type of Expansion Engine
Vertical Single Acting
Vertical Single Acting
Diameter of cylinder bore
90 mm
80 mm each
No. of cylinders
Piston stroke
150 mm
125 mm
Speed of Engine
200 RPM
200 RPM
Inlet valve opening time cam setting
8 positions
8 positions
Electric Motor
10 HP / 1000 RPM (TEFC)
20 HP / 1000 RPM (TEFC)
Piston head clearance
1.2 +/- 0.2 mm
1.2 +/- 0.2 mm
Inlet valve pastel clearance
0.4 to 0.5 mm
0.4 to 0.5 mm
Inlet air pressure
60 kgs/cm2g
60 kgs/cm2g
Outlet air pressure
5 kgs/cm2g
5 kgs/cm2g
Throughput volume at 40 kgs/cm2
400 Nm3/hr.
700-800 Nm3/hr.
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