Expansion Valve fitting and Valve expansion Adjustment

Expansion valve fitting and Adjustment

We all know the what is Expansion valve and it's operation, If you want know about it click on following link https://lavate456.blogspot.com/2019/10/expansion-valves-expansion-valve-is.html .

Now we are going to discuss about the Fitting of New Expansion valve and it's expansion setting adjustment.

Before starting the Fitting procedure of expansion valve we have to check the refrigerant pressure in the system it should be zero as shown in below link.

The valve orientation should like that the head of valve should not be on down side. It should be on top side or horizontal side as shown in below image.

While the soldering do not place open flame on the capillary bulb or near the capillary bulb.

After fitting the expansion valve we have to connect the capillary bulb or external equalizer with the expansion valve.The location of the bulb and equalizer should not be on a vertical line. It should be on a horizontal line after the evaporator or chilling coil connected with expansion valve as shown in below image.

The capillary bulb location on horizontal line should not be on a top or bottom side of line. The location of bulb is shown in below image.

While the soldering we have take some precautions that the flame should not be reach to expansion valve body. The body of expansion valve should remain cold. For that we have to take wet clothe and keep it on expansion valve while soldering as shown in below image.

After the all fitting of expansion valve we have to check the expansion valve superheat or expansion adjustment knob.We have to adjust the knob as per the refrigerant we are using and temperature that required.Some it already adjusted by company for specific refrigerant and temperature but some time we have to adjust. How to rotate that knob shown in below image.

The approximate superheat or expansion changes per turn of knob for different gases shown in below image.

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