Cartridge, control valve and plate heat exchanger

Abstract

The application discloses a connecting pipe, which comprises a pipe base body made of stainless steel, and a composite layer, wherein the composite layer comprises a nickel alloy layer and a copper layer, the nickel alloy layer is arranged between the pipe base body and the copper layer, and the inner circumferential side and / or the outer circumferential side of the pipe base body is provided with the composite layer. The connecting pipe of the application can ensure that the connecting pipe and the external component have good welding reliability when the external component is a copper component, reduce the cost of the connecting pipe, improve the welding efficiency, and the application also discloses a control valve and a plate heat exchanger using the connecting pipe.

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