The switch can be opened or closed when the well pressure is lower or higher than the reservoir pressure respectively.
此开关能在井内压力小于油层压力时开启，大于油层压力时关闭。
By the simulation and analysis of different switching mode, it is demonstrated that the pressure is lower with the decentralizing switch than with the centralizing switch.
通过对不同换向方式的模拟分析，得出分散换向比集中换向时加热炉炉压小。
Instruments based on the lower limit of two switch-contact device, the pressure to set a signal or when the value of on-off control circuit for the operating system's automatic control or the use.
仪表设上、下限二位开关型接点装置，在压力达到设定值时发出信号或通断控制电路，供作业系统自动控制或发讯用。
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