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STANDARD FEATURES TYPE 59 TYPE 58 COMMENTS
Size range 1.5"FB up to 6"RB 6"FB up tp 60" Special Sizes
Pressure ANSI 150-2500 ANSI 150-2500
Fully welded body design Yes Yes
Anti-static device Yes Yes
Self relieving seats Yes No 58- optional features (no extra costs)
Double Piston Effect seats No Yes
Primary metal to metal seal,
secondary protection with o-ring
No Yes
Plastic polymer insert on seating sealing Yes Yes
Lubricated stem Yes Yes
Lubricated seat No Yes 59- optional features
Double block and bleed Yes Yes
Metal to metal seats Yes* Yes*
Trunnion mounted ball Yes Yes
Full or reduced bore Yes Yes
Bi-directional Yes Yes
Stem anti-blow out proof design
Stem extension
N.D.T verification on body weld joints
(ultrasonic examination)
N.D.T verification on welding ends
(dye penetrant)
Minimum thickness ASME B16.34
RF or RTJ flanges to ASME B16.5