LABEL KIT 0784548 - Caterpillar

Illustration 1 g01507883
(1) Orifice tube assembly
(2) Orifice tube
(3) O-ring seal
(4) Tab
(5) Screen The orifice tube assembly (1) contains a plastic body, two screens (5), and a small brass tube. The small brass tube is referred to as an orifice tube (2), and it is located in the center of the body. The O-ring seals (3) are positioned on the body of the orifice tube to seal against leakage around the orifice tube.The orifice tube assembly is contained within the in-line dryer. If there is no in-line dryer, the orifice tube is located in the inlet to the evaporator.The orifice tube (2) restricts the flow of refrigerant. This restriction creates a pressure drop across the orifice tube. This changes the refrigerant from a high temperature high pressure liquid into a liquid vapor mixture that is low temperature low pressure. The flow rate is controlled by the pressure difference across the orifice tube.