| 摘要 |
PURPOSE: A bellows-type expansion valve, which can conveniently replaces valves by adjusting the distance between a valve body and a conduit line, is provided to prevent the leakage of the conduit line by absorbing the expansion and contraction of the conduit line. CONSTITUTION: A bellows-type expansion valve comprises a valve body(3), an expansion pipe(7), a packing ring(8) and a pressing ring(11). The valve body has connection flanges(1,2). The expansion pipe is composed of a moving pipe(4), a flow flange(5) and bellows(6). The flow tube is inserted into the connection flange of the valve body. The packing ring is installed between the connection flange and the flow tube of the valve body.
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