Saturday, October 18, 2008

schematic of reciprocating compressor

Suction:
When the piston moves towards BDC (backward stroke), the pressure within cylinder on the top of the piston drops below suction pressure in the header, thereby forcing suction valve to open and allows gas in the cylinder.

Compression:
When the piston moves from BDC towards TDC (forward stroke) pressure on the top side of the piston start increasing, thereby closing the suction valve.

Discharge:
As the piston approaches TDC, the discharge valve opens as the pressure inside the cylinder on top side of the piston is higher than that in the discharge pipeline. Thus gas is discharged in to the header.

Expansion:
During backward stroke the trapped gas (between piston & cylinder end cover) called clearance volume, expands.

No comments: