exp valve

[bernard]

Hello all

Can you use an externally equalised exp valve as an internally equalised one if you blank off the 1/4 port with cap ?

regards

Bernard

[chemi-cool]

NO!


Chemi

[bernard]

What do you think would happen if it was fitted

bernard

[Dan]

You can, however use an externally equalized TEV to replace an internally equalized TEV. Simply connect the equalizing line to the evaporator outlet and it will operate fine.

[shogun7]

The constant pressure or automatic expansion valve responds to outlet pressure. It meters liquid refrigerant to the evaporator, maintaining a constant evaporator pressure. Refrigerant flows at a rate that exactly matches compressor capacity, and the valve incorporates a diaphragm that separates atmospheric pressure and system pressure with a range spring with an adjustable pressure setting is located above the diaphragm.
Beneath the diaphragm is a stainless steel push rod and ball assembly backed by a closing spring with an o-ring located on the push rod creates a balanced port. This feature balances out the effect of increasing or decreasing inlet pressure, and aids in maintaining a constant outlet pressure. IMPORTANT..An equalizer passageway is incorporated into the valve body and this is what you don’t have on a TXV. So if you insist on using a TXV you need to drill an equilizing passageway. This can be done but you need to talk to the mfg for the right size drill

[Blueboy]

I'm with Chemi

NO

Just get the right valve I mean £20 !!!???

There are three main forces in an ext equ. TEV the spring and the equalising line pressure to shut it and the bulb pressure to open it. The main closing force is the equalising line pressure.

GET THE RIGHT VALVE