in the wrap tip bridges a space between the grooves of the other scroll member this bridging equalizes pressure between two parallel intermediate compression chambers pressure equalization between the chambers improves compressor efficiency application_number US 36175906 A description fig1 shows a scroll compressor 18 having a non orbiting scroll wrap 20 and an orbiting scroll wrap 22 as can be appreciated compression chambers are defined between the wraps as will be disclosed below as shown the compressor 18 delivers a compressed refrigerant to a condenser 15 the refrigerant flows from the condenser 15 to an optional tap line 17 which taps the refrigerant from a main flow line the tapped refrigerant has passed through an optional economizer expansion device 11 and both the tapped refrigerant and a main refrigerant flow line pass through an optional economizer heat exchanger 16 while the two flows are shown in the same direction in this figure this is for illustration simplicity only in practice typically the tapped refrigerant flows in an opposed direction through the economizer heat exchanger 16 from the main refrigerant flow as shown the tapped refrigerant passes back through an optional economizer injection line 101 into ports 100 shown schematically and back into the compression chambers defined between the orbiting and non orbiting scroll wraps 22 and 20 a main expansion device 19 and an evaporator 21 are downstream of the economizer heat exchanger 16 and refrigerant from the evaporator 21 returns to a suction.