The INVALCO Series 455 is a diaphragm-operated, two-way, double-port, full-open valve for low to moderate pressure service that must discharge large volumes of fluid quickly, such as large treaters, separators and free water knockouts. Ductile iron body and cover, double-port construction for maximum discharge, and a replaceable soft Buna-N plug for tight shutoff. NACE adaptable (RNCE available) for sour service.
Key specifications
Body / cover: Ductile iron A-395
End connections: 2", 3", 4" and 6" 150# flanges
Diaphragm operator: Steel (topworks size per model), nylon-reinforced Buna-N diaphragm; 70 psi max. recommended operating, 100 psi max. containment
Maximum working pressure: 275 psi @ -20 to 150 °F; 150 psi @ 250 °F
Temperature: -20 to 250 °F
Trim: 303 SS stem, 304 SS seat/cage, replaceable Buna-N plug (optional trims per the bulletin's trim section)
Packing: Non-lubricated Buna-N
How to specify / order
Globe body: 2" DFG-201-455 (P/N 80003636, topworks 20, Cv 44.0, Cg 1,450, 44 lb); 3" DFG-301-455 (80003637, topworks 50, Cv 81.6, Cg 2,690, 90 lb); 4" DFG-401-455 (80003638, topworks 50, Cv 89.8, Cg 2,780, 111 lb); 6" DFG-601-455 (80003639, topworks 80, Cv 540, Cg 16,700, 218 lb)
Angle body: 2" DFA-201-455 (80003631, Cv 44.0, 42 lb); 3" DFA-301-455 (80003632, Cv 81.6, 88 lb); 4" DFA-401-455 (80003633, Cv 89.8, 109 lb); 6" DFA-601-455 (80003634, Cv 550, Cg 17,050, 218 lb)
Per the bulletin, specify model number, part number and trim description; part numbers apply only to the exact configuration described
State if NACE (RNCE) construction or an optional trim is required
Only pages 1-2 of the bulletin (specifications, ordering and dimensions) were used; the parts and trim pages were not reviewed for this listing. Bulletin error to confirm with the factory: several millimetre conversions in the dimension table do not match the inch values (for example DFG-201 A = 4.4" printed as 85 mm, DFA-401 A = 4.4" printed as 163 mm, DFA-601 A = 4.8" printed as 198 mm).
Pricing and lead time are quoted per configuration. Send the model code (or your application details), product, flow range, and pressure/temperature to Flow Measurement Services for a quote. Specifications summarized from Smith Meter (INVALCO) bulletin SSIN051 Rev 0.1 (1/19) - pages 1-2 read; confirm current data with the factory before ordering.
Smith Meter (formerly FMC Technologies / TechnipFMC Measurement Solutions), now manufactured by Guidant. Flow Measurement Services supplies and services Smith Meter equipment.