KVK Corporation

expansion engine

triple expansion engine

expansion engine manufacturer

expansion engine

triple expansion engine


The Expansion Engine is vertical, single acting, triple expansion engine, 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 its
expansion engine manufacturer

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 70°C, depending on inlet air pressure, temperature and inlet cam position.

The Expansion Engine manufacturer 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 Data
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 1 2
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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