| Size | 2 “ - 48 ” |
| Pressure | 150LB-600LB |
| End Connection | Double Flange ,Lug,Wafer, |
| Bore | Standard Bore |
| Body Material | Cast Steel , Stainless Steel, Alloy Steel,Duplex Alloy ,Special Alloy |
| Seat Material | PTFE, RTFE, 316 SS, Inconel,ECT |
| Design | API 609,EN593 |
| Face to Face | API 609 |
| End Connection | ASME B16.5,ASME B16.47 |
| Checking & Test | API 598,en12266 ,ISO 5205 |
| Top Flange | ISO 5211 |
| Operation | By Lever, By Gear, By Electric or Pneumatic Actuator |
| Marking | MSS-SP-25 |
Features
? ISO 5211 top plate for direct mounting of a wide range of actuators, handles, and gears
? Adjustable stem packing features pull down gland with easy access without removal of actuator
? Tangential wedge pins are offset from center of stem putting them in compression rather than shear
? Disc stop designed to prevent disc rotation in wrong direction and potential seat damage
? Retainer clip provides blow-out proof stem
? Live-loaded stem seal system by a set of Belleville springs. Rocker shaped gland bridge compensates for uneven adjustment of gland bolts
? “Bear-X” bearing has excellent thermal, chemical and wear resistance
? One piece body with extended neck
? Self-energizing flexible lip seal soft seat design. Two points of contact on fire-safe metal seat design
Advantage
A double offset butterfly valve, known as a high-performance butterfly valve, has an extensive range of applications nowadays. This type is an improved valve based on the features and structure of the single offset butterfly valve.
First Offset – the axle of the shaft is following behind the center of the sealing point of valve disc to the valve seat.
Second Offset – the axle of the shaft is eccentric to the center-line of the valve.
The double offset structure in the stem center deviates from the centers of the disc and valve itself. Upon these features, the disc can leave the seat quickly. Furthermore, reducing unnecessary squeezing and scraping between the two parts. The wearing process then is decreased, and the valve prolongs its operation life.
Moreover, the seat of double offset butterfly valves made from metal yields the declining rate of scraping. Not to mention the ability to withstand working conditions that involve high temperature. This seat feature expands the application range to industries that require high-temperature butterfly valves in their day to day operations.
