IAPMO IGC 337-2017涵盖了用于所有管道系统（包括泵送废物）的带逆压密封和泄漏指示的进气阀，并规定了材料、物理特性、性能测试和标记的要求。本标准涵盖的进气阀符合ASSE 1050或ASSE 1051的要求，增加了泄漏指示器试验、逆压试验、极端1034 kPa（150 psi）背压试验和增加的最小空气流量能力。注:制造商应根据设备在堆叠式或单独支管式卫生排水系统中的预期应用，指定哪种标准（ASSE 1050或ASSE 1051）适用于评估中的进气阀的合规性。 本标准涵盖的进气阀采用逆压密封结构，并包括泄漏指示器。图1显示了本标准涵盖的进气阀的示例部件图。进气阀组件可包括（a）壳体；（b） 密封阀；（c） 泄漏指示器；（d） 垫片密封；和（e）屏幕。

IAPMO IGC 337-2017 covers air admittance valves with adverse pressure seals and leak indication intended for applications in all plumbing systems including pumped waste and specifies requirements for materials, physical characteristics, performance testing, and markings.Air admittance valves covered by this Standard are compliant with the requirements of either ASSE 1050 or ASSE 1051 with the addition of a leak indicator test, an adverse pressure test, an extreme 1034 kPa (150 psi) back pressure test, and increased minimum air-flow rate capability.Note: The manufacturers should specify which standard, ASSE 1050 or ASSE 1051, is applicable for compliance of the air admittance valve under evaluation, based on the intended application of the device for either stacked or individual branch type sanitary drainage systems.Air admittance valves covered by this standard are constructed with adverse pressure seals and include a leak indicator. An example component diagram of air admittance valves covered by this standard is shown in Figure 1. The air admittance valve assembly may include(a) Housing;(b) Sealing Valve;(c) Leak Indicator;(d) Gasket Seals; and(e) Screens.