Airtight valve / airtight valve, also known as low leakage valve and biological airtight valve, can separate the ventilation system into several zones, which can be used in nuclear power, pharmaceutical plant, petrochemical, food chemical, laboratory and other places. With good air tightness, it can meet the safety of zero leakage at special occasions (zero leakage at specified differential pressure)
Airtight / airtight valves in typical applications: isolation of filters and contaminated components in Bibo systems.
密闭阀/气密阀在典型应用：在BIBO系统中隔离过滤器和受污染的部件。
According to the difference of the mechanism, it can be divided into two kinds: manual and electric. The electric closed valve can automatically control and adjust the air volume with the automatic control system, even if the power is cut off, it can also ensure its tightness.
根据机构的不同分为手动和电动两种，电动密闭阀可以与自控系统配套自动控制调节风量，即使在断电情况下也可以保证其气密性。
阀体的材料和阀的尺寸可根据客户实际需求定制。
符合美国SMEN509或欧盟EN12266-2标准，压差达到10英寸水柱（2500PA）， 零泄漏。并且可满足特殊场合下零泄漏（在指定压差下零泄漏）的安全要求。
