负压压力表 » Vacuum pressure gauges 我觉得便宜的物品未必质量一定不好。 » I feel that the quality of cheap goods may not be necessarily bad.
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Designed to test pressure vacuum breakers, reduced pressure backflow preventers or double check valve assemblies, allowing you to eliminate both pressure and differential test gauges.
适用于检测压力真空断路阀，减压防回流阀或双止回阀总成，不再需要压力表和压差表。
The constant pressure flowmeters (CPFMs) were used to calibrate vacuum leaks and vacuum gauges in some national laboratories.
恒压式气体微流量计(CPFM)被多个国家级实验室选作为计量学设备，用来校准真空规和真空漏孔。
Security: Our equipments have ant-blocking device, also have pressure gauges, alarms, safety valves and vacuum equipment. Normal operation are going on under negative pressure or ordinary pressure.
答：(1)安全：我们的设备有防堵塞装置，还配有压力表、报警器、安全阀、负压设备，正常运行都是负压或常压下工作。
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