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產品資訊
Velan
Gate, globe, and check valves
Quarter-turn Valves
Velflex Cryogenic High Performance Flanged Butterfly Valve
Velflex Cryogenic High Performance Flanged Butterfly Valve
Size Range
NPS 6 - 48 (DN 150 - 1200)
Pressure Class
ASME classes 150 - 300
Standard Connections
Flanged
Features & Benefits
- Stem seal: Viton O-rings; Expanded graphite ring for fire safe
- No cavity: There is no cavity to allow build-upof solids
- Double offset: Ensures a progressive smooth and low friction seat-disc closing. Hardened sealing surface to provide high level of tightness and long lifetime
- Fire safe design: All metal construction providing inherent fire safe
- Unique sealing system: Combined with the eccentric disc rotation, the patented flexible metallic seat provides an exceptional tight shutoff even with high temperature fluctuations
- Actuators: Pneumatic, hydraulic, electric or manual gear; fast acting actuators for Emergency Shut Down (ESD) function
- Extended Bonnet: With a sufficient gas column to keep the stem packing away from the cold fluid
- High quality castings: With X-ray and PT examinations from approved foundries
- Stainless steel shaft bearings: Coated with nickel-reinforced PTFE for high cycle and smooth operation
- Reliability: Reliability of valve operation affects service life and ease of inspection and maintenance. In order to predict reliability, a sound valve design must be backed up by a stress analysis and functional qualification testing under critical operating conditions.