F1 - Temperature sensing
This is a sealed diaphragm and sensor
containing refrigerant. As refrigerant leaving
the evaporator coil outlet passes over
sensing element (12) the refrigerant (9)
above the diaphragm (11) expands moving
pin (8) downwards pushing ball valve (6)
away from the metering orifice (5).
F2 - Pressure compensation
This is a passage (10) in the block valve
outlet side where refrigerant can build up
under the diaphragm (11) to act as an
opposing pressure to help regulate the
amount of refrigerant into the evaporator coil
inlet side.
F3 -
liquid
Automotive
bulb (3) is attached to the evaporator
outlet tube surface.
F2 - Pressure compensation tube
This is a hollow tube connected to the
evaporator outlet tube and senses the
pressure of the R134a refrigerant leaving
the evaporator coil. (Other TX valves may
not use this tube as pressure is provided
internally within the valve).
F3 - Pressure spring
This spring (6) is located under the ball
valve (5).