Subaru Legacy/Outback

1999-2003 of release

Repair and operation of the car

The K/V broad valve - a design and the principle of functioning

Design of the broad valve

1 — the Thermosensitive element
2 — the Diaphragm
3 — From the evaporator (low pressure)
4 — the Throttle

5 — To the evaporator (low pressure)
6 — the Valvate ball
7 — To the compressor
8 — From a receiver dehumidifier

The design of the broad valve is presented on an illustration.

The broad valve is connected both to inlet, and to final to ports of a dilator. The valve serves for the transformation arriving to it from the receiver dehumidifier which is under a high pressure of liquid coolant in the suspension of low pressure coming to the evaporator. The coolant cooled, being under low pressure easily evaporates, taking away heat from the air filling salon.

The valve carries out the task after transformation of a working body of system due to automatic control of a coolant consumption according to the current thermal loading.

Temperature of coolant is controlled by the special thermosensitive element which is built in the low pressure canal of the broad valve. Management of account characteristics is made by means of the ball valve which is settling down in high-pressure part of assembly.

At increase in thermal load of system coolant temperature at the exit of the evaporator rises that conducts to increase of pressure of P1 around installation of a thermosensitive element. As soon as the size of the effort developed by pressure of P1 becomes higher than the sum of the efforts developed by P2 pressure at the exit of the evaporator and a spring (F) i.e. the condition is satisfied: P1> P2 + F, occurs the push-up down diaphragms leading to rise over the saddle of a valvate ball and corresponding increases in a consumption of coolant.

At decrease in thermal loading the return picture takes place.