Butterfly valve

manualshut-offfor gas

Features and 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.