Valve,check

3. REQUIREMENTS

3.1 ;Complete 4 inch swing check valve assembly must be in accordance with Emerson Crosby Drawing DS-B-90380, except as amplified or modified herein.; 3.2 ;^ Emerson drawing DS-B-90380 must be Revision E, Interim Change 3;

3.3 Material for Parts Requiring Certification - Quantitative chemical and mechanical analysis is required for the parts listed below unless specifically stated otherwise: Part - ;Body, Item 1 and Cover, Item 12; Material - ;ASTM-B369, UNS C96400; Part - ;Stud, Item 2; Material - ;QQ-N-286 in accordance with MIL-DTL-1222; Part - ;Self-locking Nut, Item 3; Material - ;QQ-N-281, Class B SELF-LOCKING ELEMENT- ASTM-D4066, Group 01, Class 1, Grade 1;