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US4085921A Multiple-mode fluid-flow control valve arrangement 失效
多模流体流量控制阀装置

Multiple-mode fluid-flow control valve arrangement
摘要:
A fluid-flow control valve arrangement comprising valve means operable in different conditions including variable-flow, constant-flow and zero-flow mode conditions depending upon predetermined ranges of a prescribed operational parameter, the valve arrangement being useful especially for the control of the flow of fuel in a heating device such as a gas-burning water heating device.
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