Actuators & Accessories

Series 4 Triple Offset


  • Default firesafe design and NACE versions available.
  • Body Type

    Wafer, Lug, Double Flanged, Buttweld


    CS, SS


    WCB, CF8M, CF8


    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


    • 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