本标准规定了消防系统抗水锤止回阀的认证要求。本标准规定了单水道或多水道抗水锤止回阀的要求。本认证标准中涵盖的抗水锤止回阀配有法兰、沟槽、螺纹或对夹式端部连接。如果其他类型的抗水锤止回阀符合本标准的要求和意图，则可通过FM认证。特殊设计的抗水锤止回阀可能会经过特殊测试，以确定其适用性。 本标准涵盖了消防泵排放管线中预期可能导致压力波动或水锤的防水锤止回阀的设计和性能要求。

This standard states Approval requirements for anti-water hammer check valves for fire protection systemsThis standard defines the requirements for anti-water hammer check valves with single or multiple waterways. Anti-water hammer check valves covered in this Approval standard are supplied with flanged, grooved, threaded or wafer style end connections. Other types of anti-water hammer check valves may be FM Approved if they meet the requirements and intent of this standard. Anti-water hammer check valves of unusual design may be subjected to special tests to determine their suitability.This standard encompasses the design and performance requirements for anti-water hammer check valves for their intended installation in the discharge line of a fire pump where conditions may be expected to cause pressure surges or water hammer.