Series 4 Triple Offset


Default firesafe design and NACE versions available.

Body Type

Wafer, Lug, Double Flanged, Buttweld






316 SS, 410 SS, 17-4 PH, XM-19


13% Chrome, Stellite Gr.21

Seal Ring

316 SS+Graphite, 316 SS+PTFE, 

Inconel 625+Graphite, 316 SS 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 

Leakage Class

Class VI

Design Standard

API 609 Category B, BS EN 593

Testing Standard

API 598, BS EN 12266-1

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  • ISO 5211 top plate for direct mounting of a wide range of actuators, handles, 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. Thrust plate fixed to the bottom of shaft with two screws retain the stem against blowout
  • 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