TTF gate valve has three types of bonnet. One is bolted bonnet, which the body is connected with bonnet by bolts and sealed by spiral gasket with advantages of convenient maintenance; one is welded bonnet, which the body is fully welded with sealing bonnet of no leakage; another is pressure-in bonnet, which the body is screwed into the bonnet and sealed by inner pressure-in ring with better sealing ability for higher pressure.

 

Design Structure and Features: A. Design and Manufacturing: As per ANSI B 16.34, API 602, BS 5352 B. Ends Connection: 1) SW Dimensions as per ANSI B16.11; JISB2306 2) Screwed Dimensions as per ANSI B1.20.1 BS21; Structure and Features: Full Bore or reduced bore   Outside Screwed and Yoke                                                           Bushing Type   Bolted, fully welded and pressure-in bonnet ISO7/1; JISB0203 C. Valve Inspection and Test: As per API 598 D. Material: According to AISI/ASTM E. Body Material: A105; F5; F11; F22; 304; 304L; 316; 316L; LF2¡­    F.  Markings as per MSS-SP-25