Abstract: This refrigerant distributor (20) is used in a refrigeration system (10) for delivering refrigerant from a thermostatic expansion valve (18) to a multi-circuit evaporator (22). The distributor (20) includes a body (30) having an inlet (32) providing a nozzle (40), an outlet (34) providing a plurality of discharge passages (52) and a head space (48) disposed between the nozzle (40) and the discharge passages (52). A member (56) is movable in the head space (48) to vary the flow from the nozzle passage (40) into the discharge passages (52) to suit normal load and pulldown load.

Abstract: This expansion valve (10) can be used for a refrigeration system (1) having a compressor (2), an evaporator (3) and a condenser (4). The valve (10) comprises a body (12) including an inlet passage (26), an outlet passage (38), a piston passage (28) defining a piston port (30) and valve chamber (32), the piston passage (28) defining a piston chamber (46) communicating with valve chamber (32). A piston (40) is movably mounted in the piston passage (28) and selectively controls flow through the piston port (30), the piston (40) having an interior passage (60) communicating with the inlet passage (26) and having a pin port (62) communicating with the valve chamber (32), the piston (40) having a biasing spring (52) biasing the piston (40) into a closed position. A valve pin (70) is movably mounted in the valve chamber (32) and controls flow through the valve pin port (62), the valve pin (70) having a spring (74) biasing the pin (70) into the closed position.

Abstract: This refrigeration system expansion valve (10) includes a body (12) having an inlet (20) and an outlet (22) and a valve assembly (24) within the body (12). The valve assembly (24) includes a first port (28) communicating with the inlet (20) and a second, larger port (30) communicating with the outlet (22) and further includes a pin (32) having a first pin portion (34) received by the first port (28) and a second pin portion (36) received by the second port (30). A stepper motor (100) attached to the valve body (12) cooperates with an actuator assembly (60) attached to the pin (32) to induce longitudinal movement into the pin and thereby control refrigerant flow through the valve.

Abstract: This expansion valve (10 ) can be used for a refrigeration system (1) having a compressor (2), an evaporator (3) and a condenser (4). The valve (10) comprises a body (12) including an inlet passage (26), an outlet passage (38), a piston passage (28) defining a piston port (30) and valve chamber (32), the piston passage (28) defining a piston chamber (46) communicating with valve chamber (32). A piston (40) is movably mounted in the piston passage (28) and selectively controls flow through the piston port (30), the piston (40) having an interior passage (60) communicating with the inlet passage (26) and having a pin port (62) communicating with the valve chamber (32), the piston (40) having a biasing spring (52) biasing the piston (40) into a closed position. A valve pin (70) is movably mounted in the valve chamber (32) and controls flow through the valve pin port (62), the valve pin (70) having a spring (74) biasing the pin (70) into the closed position.

Abstract: This refrigeration system expansion valve assembly (10) includes a valve body (12) having an upper portion (14) an intermediate portion (15) providing a valve chamber (17) and a valve port (18), and a lower portion (16). A valve inlet (20) and outlet (22) communicate with the valve chamber (17) on each side of the valve port (18). A piston assembly (24) is mounted in the body (12) for closing the valve port (18). The piston assembly (24) is actuated by a push rod assembly (26) driven by a stepper motor 28. The push rod assembly (26) includes a threaded member (102) slidingly and non-rotatively mounted in the body (12) and linearly driven by the motor shaft (30) which is threadedly received by said threaded member (102). The piston assembly (24) is urged into engagement with the push rod assembly (26) by a return spring (36) and includes a fluted nose portion (80) and a bleed passage (90, 92) communicating valve chamber (17) and the spring compartment (75).