Gas compressor allows transport of liquid LPG (liquefied petroleum gas) from one place to another with vapour transfer.

Pressure difference should be present for the transfer of liquid LPG. Gas compressors suck LPG in liquid state from one tank and forces it into another tank which causes pressure increase there and with increased pressure LPG  starts flowing into the other tank to fulfill the transfer.

Suitable elevation difference as required by the pumps is not needed; liquid transfer can be made in every circumstance.

Compressor has two pistons where while one piston makes suction action the other piston forces it to the place of transfer; this system is maintained by suction and compression valves.

Piston rings sucking and compressing the gas are made from special Teflon (PTFE) material.

To prevent gas passing into the bottom section, the lubrication part, a set of adjustable with a nut and spring gaskets are placed at the neck of the piston pin for sealing purposes; this gasket is made from special Teflon material.

Movement of the pistons is maintained by cranks, crank is placed inside the crankcase and lies on bearings on two sides, oil pump is activated with one side of the crank and automatic lubrication is maintained with the lubrication pump.  Sufficient lubrication is checked by visual inspection through the inspection cap placed on the side and by oil pressure indicator. A pulley is placed on the other side of the crank and it obtains its movement from electric motor driving the belts.

A safety valve to protect the compressor from the pressure increases that might occur on the output (compression) end is installed.

Suction and compression heads are joined with a four-way valve to interchange the suction and compression directions.

Suction head is connected to a liquid trap through a filter. Liquid trap is a tube with a float inside and prevents entry of liquids into the compressor.