Diaphragm
Sensing Bulb
Spring
Needle and Seat
Review
100
Where is the diaphragm located?
What is inside the valve body
100
At what part of a refrigeration system should the sensing bulb be mounted?
What is outlet of the evaporator(suction line).
100
What is another term that the spring is referred to?
What is 'super heat adjustment spring'
100
The needle and seat controls what?
What is flow of refrigerant.
100
What would an undersized TX valve cause?
What would cause high superheat, due to not enough liquid refrigerant being dispersed into the evaporator.
200
What is the pressure that opens the TX valve?
What is sensing bulb pressure.
200
At what position should you not mount the sensing bulb?
What is on the bottom of the piping.
200
Adjusting the spring clockwise would do what?
What is increase the super heat.
200
The downward force acting on the needle is what?
What is diaphragm.
200
A R-134A system with an evaporator outlet temperature of 45 F, and a suction pressure of 35 PSIG. What would the super heat be? *use p/t chart*
what is 5 F super heat.
300
What is the diaphragm typically made of?
What is thin stainless steel metal.
300
What is the sensing bulb responsible for?
What is reading the temperature coming out of the suction line, will adjust valve depending on pressure, temperature correlation.
300
The less of tension on the spring, the less?
What is super heat.
300
The downward force acting on the needle does what?
What is opens the needle and seat, and allows more liquid refrigerant through the evaporator.
300
The TX valve balancing equation is?
Bulb Pressure + Liquid Pressure = Spring Pressure + Evaporator Pressure.
400
What are the three acting pressures on the diaphragm?
What is sensing bulb pressure, evaporator pressure, and the spring pressure.
400
If the sensing bulb loses its charge, what will occur?
What is TX valve will remain open.
400
What would occur if the spring lost its tension?
What is system would not have enough super heat.
400
What are the two acting forces that would cause the needle and seat to close?
What is evaporator pressure and the spring pressure.
400
What would happen if you used a TX valve, with a liquid charged sensing bulb on a low temp application, after the defrost termination?
The bulb pressure will be excessive, causing the valve to stay open. This will over feed the evaporator, and cause liquid to flood to the compressor upon termination of the defrost.
500
With an evaporator pressure of 35 PSIG, a spring pressure of 15 PSIG and a sensing bulb pressure of 52.5PSIG, will the TX valve be open, or closed?
What is open, as the sensing bulb pressure is greater than the evaporator and spring pressure combined.
500
What are the four types of bulb charges?
What is liquid charge, cross liquid charge, vapor charge, and cross vapor charge.
500
If the spring pressure is 15 PSIG, the evaporator pressure is 22 PSIG and the bulb pressure is 37 PSIG, does the system have a high superheat, low superheat, or is the system at a proper superheat?
What is proper superheat.
500
A R-404a system with the sensing bulb pressure of 40 PSIG, a evaporator pressure 32 PSIG and a spring pressure of 14 PSIG, what would occur in the TX valve?
What is the valve would be closed, which would increase the superheat.
500
Tony has ten ton unit at home, how many t's are in there?
1, there is one 't' in there.
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