UB series are stainless steel butterfly valves with a double eccentric structure.
All-stainless steel and PTFE seats are used in the main parts.
It has high corrosion resistance and can be used in fields such as chemical plants.
Double eccentric stainless steel with PTFE seat Butterfly valves (UB series)
Specification
| Maximum service pressure | 10UB | 1.4MPa |
|---|---|---|
| 16UB (size 1½” to 12″) | 2.0MPa | |
| 16UB (size 14″ to 24″) | 1.4MPa | |
| 150UB | 1.9MPa | |
| Service temperature range | PTFE seat | -29℃ to +160℃ |
| Carbon filled PTFE seat | -29℃ to +200℃ | |
| Wall thickness | ASME B 16.34 Class 150 | |
| Face to face dimensions | 6″ and smaller | ISO5752 Short |
| 8″ and larger | ISO5752 Medium | |
| Coupling flanges | 10UB | JIS 10K |
| 16UB | JIS 16K | |
| 150UB | ASME Class 150 | |
Standard Materials
| Parts | ASTM Materials | JIS Materials |
|---|---|---|
| Body | A351 Gr.CF8*1 | SCS13A*1 |
| Stem | 304SS | |
| Disc | A351 Gr.CF8*1 | SCS13A*1 |
| Gland | A351 Gr.CF8*1 | SCS13A*1 |
| Seat ring | PTFE*2 | |
| Seat retainer | 304SS | |
| Gland packing | PTFE | |
| Gasket | PTFE | |
| Set bold | Stainless Steel | |
| Taper pin | 316SS | |
| Stem bearing | METAL BACKED PTFE | |
| Gland bolts | Stainless Steel | |
| Thrust washer | PTFE | |
| End plate | A351 Gr.CF8 | SCS13A |
| End plate bolts | 304SS | |
*1.CF8M(316)/SCS14A(SUS316) is available as an option.
*2.Carbon filled PTFE seat rings are optionally available.
Feature
Double eccentric Kinematics
The valve’s stem is designed eccentric to both the center of the seat ring (by X) and the center of the valve bocy (by Y), which makes the clearance C between the seat ring and the disc seat surface on its fully open position (Fig. 1). Disc seating surface is spherically machined and contacts PTFE seat tightly through 360℃ for leak-free service. All these help minimize frictional wear of seat rings and reduce the valve operating torque considerably.
Durable Seat Rings
Seat rings are made of PTFE with stainless steel supporter. Furthermore, double-eccentric kinematics relieve seat ring from damage or wear which is a rather usual problem of conventional butterfly valves. This makes the service life twice as long as rubber seated butterfly valves.
Retightening of Gland Packing
There is a room between the gland and the level or gear to allow retightening of gland boltings without trouble of disassembly of the level or gear during plan operation (Fig. 2).
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