During suction strokes of {TAIL ~ the pistons} 11, the refrigerant gas in the suction chambers 115, 115 is sucked into {HEAD ~ the pump working chambers} 14, 14, respectively, through the suction openings 17, 17 
During suction strokes of { TAIL ~ the pistons } 11 , the refrigerant gas in the suction chambers 115 , 115 is sucked into { HEAD ~ the pump working chambers } 14 , 14 , respectively , through the suction openings 17 , 17
OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH