Series 4 TriO Triple Offset

Series 4 TriO Triple Offs...

Product Description


Default firesafe design and NACE versions available.

Body Type Wafer, Lug, Double Flanged, Buttweld
Body CS, SS
Disc WCB, CF8M, CF8
Stem 316 SS, 410 SS, 17-4 PH, XM-19
Seat Stellite Gr.21
Seal Ring S31803+Graphite, XM 19+Graphite, Inconel 625+Graphite, Solid Metal Seat
Size Range Series 4A, 4B, 4C, 4W – 3″ to 48“ (DN 80 to 1200)

Series 4D, 4E, 4F, 4Y, 4G, 4H, 4J, 4K

– 3″ to 24“  (DN 80 to 600)

Pressure Rating Series 4A, 4B, 4C, 4W – Class 150

Series 4D, 4E, 4F, 4Y – Class 300

Series 4G, 4H, 4J, 4K – Class 600

Design Standard API 609 Category B, BS EN 593
Testing Standard API 598, BS EN 12266-1


  • ISO 5211 top plate for direct mounting of a wide range of actuators and gears
  • Seal ring retainer, made of identical metal as the disc, clamps and combines the seal ring rigidly on the disc face into a robust, composite unit
  • Standard hard faced Stellite seat integral to body
  • Robust single piece stem
  • Live-loaded stem seal system by a set of Belleville springs. Rocker shaped gland bridge compensates for uneven adjustment of gland bolts
  • SS316+Nitriding bearings with graphite rings designed to take high radial and axial stem loads, and for ingress protection
  • One piece body
  • Replaceable laminated seal ring is located on the disc, precision machined for bi-directional sealing


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