Fisher Posi – Seal A31A rotary control butterfly valve – Emerson feature eccentrically mounted discs and are known for their wide range of applications and excellent shutoff performance. They are suitable for a variety of control and isolation conditions, from low to high temperature, with pressure ratings to ASME CL2500 and sizes from NPS 2 to 72. Fisher Posi – Seal A31A rotary control butterfly valve – Emerson is a high performance butterfly valve with a flat key shaft for switching applications. The A31A is available in sizes from NPS 14 to 24 and in pressure classes CL150 and CL300. Valves are available in either clip design or single flanged (lug) body. Low temperature versions of the valves are available in sizes from NPS 3 to 24.
Fisher Posi – Seal A31A rotary control butterfly valve – Emerson is a high performance butterfly valve with a flat key shaft for switching applications. The A31A is available in sizes from NPS 14 to 24 and in pressure classes CL150 and CL300. Valves are available in either clip design or single flanged (lug) body. Low temperature versions of the valves are available in sizes from NPS 3 to 24.
Fisher Posi – Seal A31A rotary control butterfly valve – Emerson have following features:
1.Economical tight closure
The pressure-assisted seal design ensures tight closure, allowing for economical actuators in closing applications that meet ASME B16.34 requirements
2.Good closure of oneness
The concentric rotation allows the disc to remain in a closed position in the event of sudden pressure increase or actuator failure
3.True two-way shutdown
The torque required to open and close the valve is the same regardless of the direction of differential pressure
4.Simple installation
Fisher Posi – Seal A31A rotary control butterfly valve – Emerson body is self – positioned on the pipe flange bolt for fast and accurate valve alignment
5.Maintenance is simple
All the parts, including the shaft and the butterfly plate, can be used interchangeably, which makes after-sales service simple and can reduce maintenance costs.
| Model | Fisher A31A |
| Valve Body | Carbon Steel (WCC or SA 516-70) (5) |
| CF8M (316 SST) CL150 | |
| CF8M FMS 20B16 (0.04% min. carbon) CL300 | |
| Disc | CF8M (316 SST) w/ or w/o Hard coating |
| CF8M with CoCr-A edge (Alloy 6) | |
| Shaft | S20910 |
| S17400 (17-4 PH 1025) | |
| S17400 (17-4 PH H1150M) | |
| Bearings | PEEK (2) (standard) |
| S31600 (3) | |
| Packing | PTFE Packing and PTFE ENVIRO-SEAL Packing |
| Graphite packing | |
| Graphite packing with oxidizing media | |
| Seal Ring and Backup Ring |
PTFE Seal Ring |
| UHMWPE (4) Seal Ring (CL150 Only) | |
| Phoenix III and/or FireTested Construction | |
| Seal Ring | NOVEX S31600 Seal (3) Ring (CL150) |
| NOVEX S31600 Seal (3) Ring (CL300) | |
| NOVEX S21800 Seal Ring (CL300) |
Application of Fisher Posi – Seal A31A rotary control butterfly valve – Emerson
1. Coal gasification project
2. Clean energy gasification unit
3. Electricity
4. Hydrocarbons
5. Chemicals
6.Pulp and paper
After-sales service
Online support and Video technical support.
