| 摘要 |
The thermostatic expansion valve has a valve controlling flow from the inlet to the outlet and is biased to seated position by the compressed spring adustably mounted in the outlet. The valve is actuated by a push pin extending from the underside of the diaphragm pad. The diaphragm is mounted between upper and lower stampings welded together at their periphery. The space above the diaphragm is connected via a capillary tube to a feeler bulb and is part of a charged system the pressure of which varies with temperature at the bulb. The lower head stamping is connected to the valve body by novel means. The upper end of the body is provided with a groove receiving an O-ring. Inside this groove the body is provided with an annular extension outside the push pin hole. The lower head stamping is placed on the body and the annular extension is crimped over the stamping to firmly fix the head on the body while devloping high unit pressure on the O-ring to provide an effective seal at low cost. This also allows use of different metals in the head and body. |
