DelVal Series 4
TriO Triple Offset
Butterfly Valves
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 |
FEATURES
- 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
