| 摘要 |
An expansion valve (40) includes a valve body (41), an adjusting mechanism (46) for adjusting a flow rate of a refrigerant supplied to an evaporator (5) and a control mechanism (54) for controlling the adjusting mechanism (46) in accordance with a temperature of the refrigerant supplied to a compressor (1) from the evaporator (5). The body (41) has a first passage (42) for introducing the refrigerant to the body (41), a second passage (43) for supplying the refrigerant from the first passage (42) to the evaporator (5) and a third passage (44) for transferring the refrigerant to the compressor (1) from the evaporator (5). The adjusting mechanism (46) has a restriction (47a) for connecting the first passage (42) with the second passage (43) and a valve member (48) for adjusting a degree of the restriction (47a). The control mechanism (54) has a heat sensitive chamber (61) filled with the gas in a sealing manner and a diaphragm (57) movable in accordance with pressure in the sensitive chamber (61). A transmitting member (65) transmits the temperature of the refrigerant flowing in the third passage (44) to the gas in the sensitive chamber (61) and the movement of the diaphragm (57) to the valve member (48). The body (41) is made of a synthetic resin. A metal member (47) is disposed in the body (41) between the first passage (42) and the second passage (43). The metal member (47) has the restriction (47a) and a valve seat (50) for contacting the valve member (48). <IMAGE> |
