ITT Engineered Valves
Skotch Trifecta Burner Shut-Off Valve
The Skotch Trifecta is an FM-approved automated gas burner double-block-and-vent shut-off valve system that combines two independent spring-to-close block valves and a normally-open vent valve in a single housing driven by one actuator, ensuring reliable in-sequence operation with no exposed linkage. All ports are soft-seated with metal-to-metal backup seats, providing ANSI/FCI 70-2 Class VI shutoff. Fabricated T4000F bodies cover 2"-6" and cast T4000C bodies cover 1"-2" for burner and igniter fuel-gas service.
Ratings
| Size Range | 1" - 6" (cast T4100C-T4200C 1"-2"; fabricated T4200F-T4600F 2"-6") |
|---|---|
| Pressure Rating | Max. operating pressure 50 PSIG (T4000F, T4100C); 60 PSIG (T4150C / T4200C) |
| Temperature Range | Max operating 180°F (T4000F); T4100C -20°F to 150°F; T4150C/T4200C -20°F to 180°F; ambient standard 140°F (FM), optional 180°F |
| Flow Coefficient | Cv: T4200F 80, T4300F 167, T4400F 245, T4600F 430; T4100C 14 |
Design & Construction
| Body | Fabricated ASTM A105 carbon steel (T4000F); ANSI B16.34-compliant cast carbon steel ASTM A216 Gr. WCB (T4000C) |
|---|---|
| Trim | 6061-T6 aluminum, ASTM A511 Type 316SS (T4000F); ASTM 300-series stainless steel (T4000C) |
| Seat | All ports soft-seated with metal-to-metal backup seats; independent spring-to-close block valves |
| Packing / Seal | Buna-N seals standard; Viton optional |
| End Connections | Inlet/Outlet ANSI B16.5 Cl 150 raised-face flange; Vent ANSI B2.1 female NPT, Sch 40/80 spigot or buttweld |
| Actuation | Electropneumatic single actuator; fail-in-last-position, fail-closed (FM approved) or fail-closed (non-FM); pneumatic supply 70-120 PSIG (60-120 PSIG for T4100C) clean dry air |
Standards & Compliance
| Design Standard | ANSI/FCI 70-2 Class VI shutoff; meets/exceeds FM 7400 for Safety Shutoff Valves (SSOV); Factory Mutual (FM) approved (fail-closed); NFPA and IRI vent-size recommendations; ANSI B16.34 (T4000C body) |
|---|---|
| Electrical | NEMA 1, 3, 4, 13 standard; NEMA 7, 9 (Class I Div 2 Gr B, C, D) optional |
Applications
| Services | Automated safety shut-off of natural gas, propane and other fuel gas (double block and vent) for burners and igniters |
|---|---|
| Industries | Boilers, furnaces and process heating equipment |
