| 摘要 |
The control has more than one outlet valve (1a,1b), where one valve is opened earlier than the other. The first valve to be opened may have a smaller diameter than the others. Two of the outlet valves preferably are opened by a common bridge, with an operating unit acting on the bridge in the middle between the outlet valves. Alternatively, the valves may have equal diameters and the operation unit may be non-central.
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