VANESSA SERIES 30,000 TRIPLE OFFSET VALVES
Vanessa triple offset valves perform bidirectional zero leakage tightness.
according to ‘Leakage Rate A’ of ISO 5208 and EN 12266-1 standards
and the ‘Resilient Seat Valves’ requirement of API 598
A blue and silver valve with a blue pipe
Description automatically generated
Valve construction
Series 30,000 is a robust valve capable of performing bidirectional zero leakage notwithstanding extreme temperature conditions. Indeed, its all-metal construction, inherently fire resistant, is unaffected by temperature changes and a fully integrated long bonnet keeps packing protected from extreme service temperatures (from -60 °C to 450 °C - from -76 °F to +842 °F).
Furthermore, the flange spot facing ensures flange bolting nut and washer planarity, increases reliability and safety of flanged joints with long term tightness and no re-tightening requirements.
Sealing components
The materials chosen for sealing, coupled with precise machining, significantly contribute to extending the life of the valve. Every Vanessa Series 30,000 valve in basic configuration features a smoothly grinded seat with Stellite® grade 21 weld overlay highly resistant to galling, abrasion, erosion and corrosion.
The Vanessa seal ring is the key flexible component necessary to perform sealing and may be laminated in Duplex (as a minimum) or manufactured as a one-piece solid. Seal rings are easily interchangeable thanks to their self-centering ability and the presence of reference pins that simplify assembly. In addition, a dynamic spiral wound gasket ensures an adequate expansion and contraction of the seal ring during opening and closing.
Trim
Vanessa valves all share the same trim – a combination of optimized angles, and robust bearings and shafts. Our engineers have developed over four decades each and every component to maximize safety while keeping an extremely streamlined and functional design:
- The one-piece shaft maximizes robustness to a level which is not reachable with stub shafts commonly used with low pressure butterfly valves.
- Two-piece packing glands enhance safety and reliability in terms of fugitive emissions over time.
- The shaft to disc connection is secured by keys (no pins) to optimize torque transmission without compromising shaft integrity.
- The disc is not a sealing element, only a carrier. Being consistent with body material, the disc can be exposed to the same level of abrasion and corrosion of the valve body without negative effects on tightness and operability.
- Heavy duty bearings and thrust bearing are designed to withstand high pressure loads and wear.
- Internal and external retaining devices ensure Vanessa blowout-proof one-piece shaft is safe to operate and provide complete compliance with API 609.
- Standard reinforced, braided and flexible graphite bearing protectors eliminate the risk of particle intrusion, ensure constant torque demand and increase overall reliability.
- Standard reinforced, braided and flexible graphite bearing protectors eliminate the risk of particle intrusion, ensure constant torque demand and increase overall reliability.
- Open/closed disc references and an external disc position indicator simplify installation/removal procedures and are in compliance with API 609.
