How to test TXVs' capacity

[liujunwei]

see the picture,it is a test method of rating capacity for TXVs used in automobile air-conditioning system.but there is no superheat.i think there must be superheat to open a TXV,am i right?i am so confused and need your help.
could you tell me the test method of TXVs'capacity you know?Thanks!:confused:

[The Viking]

In your picture they are testing the capacity of a TXV, they are keeping it "manually" open by immersing the temp sensing bulb in water of a fixed temperature.

I always found the easiest way to find a TXVs capacity is to take the details of it and look it up in the manufacturer's data book.

[star882]

That would cause the TXV to go "wide open" unless it is MOP type.
That method of testing doesn't look like a very good idea as it would cause floodback.

[The Viking]

Aha,

But if you look at the diagram, it's some sort of test rig and not a "system"...