受侧向荷载作用的金属膜常被用作压力装置的超压防护或实现某些特定的开关操作。
Metallic membranes under lateral pressure are widely used to protect equipments from the danger of overpressure or to accomplish some particular switch operation.
特殊设计的数字式压力显示，精密负压调谐，外置控制脚踏开关和精心选配的低噪声无油膜式泵，使产品更方便操作控制和使用。
The sophisticated designs of digital pressure display, precise negative pressure adjustment, and foot switch control make this mute oil pump more convenient to manipulate.
该阀采用环空外压操作测试阀的开关，不需要保压，而且采用简单的机械压力平衡机构代替了专用计量套。
Without keeping annulus pressure to static and instead of special metering by simple mechanical pressure ba lance structure, this valve is conducted by annulus pressure.
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