Diaphragm Principle

COMPTON Compressors and Gas Circulating Pumps fall into two main categories-machines designed to deliver oil-free compressed air, and machines to compress, evacuate or circulate gas. 

Figure 1 shows a cross-section of a typical air compressor. The machine is actually our D 189 but the same principle applies to all our units 
(Note- the part numbers apply only to the D189) 

The pump operates as follows: 
An eccentric (15-4) mounted on the motor shaft carries a grease packed and sealed ball-bearing (20).As the shaft rotates reciprocating motion is transmitted via the connecting rod (13G) to the bottom washer, (5-4, 84-5 and 8) diaphragm and top washer assembly. 

This motion (see figures 2 and 3) provides a pumping action inside valve plate (10-4) and actuates the valves (506) and (29), thus admitting air into the pump and discharging it into the surge chamber. The incoming air is filtered by inlet filter (275S) and is discharged through outlet connections (71 or 2850).