Solenoid valves can be installed in suction lines, return lines (liquidvapor), pressure-equalizing lines, or bypass lines. -Direct or servo-operated valves (EVRA) -Servo-operated for hot gas defrost (EVRAT) -Direct operated, servo-operated, forced servo-operated with stainless steel bodies (EVRSEVRST) -Pilot operated (PM) -Gas powered (PML), Gas powered stop valves (GPLX) -Gas powered two-stop solenoid valve (PMLX)