Patent ID: 6145753
Filing Date: 2000-11-14
Classification: F25B,Y10S

Abstract:
A thermal expansion valve, comprising:a valve housing having a first refrigerant passage, which is adapted to pass a liquid-phase refrigerant, and a second refrigerant passage, which is adapted to pass a gas-phase refrigerant, the valve housing having a wall that separates the first and second passages, the wall having an opening connecting the first and second passages;a valve that controls flow of the liquid-phase refrigerant entering the first passage;a valve controller mounted on the valve housing, the valve controller having a diaphragm and first and second chambers separated by the diaphragm;a rod operatively extending between the diaphragm and the valve, the rod being movably displaceable through the opening in the wall to open and close the valve to control the amount of the liquid-phase refrigerant entering the first passage; anda seal ring positioned in the opening and engaging the opening surface of the wall and the rod to seal the opening, wherein the seal ring has an X-shaped profile, consisting essentially of four joined sealing portions, two of which engage the opening surface and two of which engage the rod member to seal the opening against the rod and the opening surface of the wall.