The INVALCO Series 418 (ductile A-395) and Series 420 (steel WCB) are diaphragm-operated two-way valves for high-pressure separators, dehydrators and any application that must control fluid output. Hammer union construction cuts repair downtime, a wide range of trim sizes covers most operating conditions, globe or angle bodies ease piping, and the valves are NACE adaptable for sour service.
Key specifications
End connections: 1" and 2" FNPT; steel union body cover
Diaphragm operator: Steel, 65 sq. in., nylon-reinforced Buna-N diaphragm; 70 psi max recommended operating, 100 psi max containment; standard topworks direct action (normally closed)
Stem: 303 SS; taper plug and seat in 416 hardened SS
Temperature: -20 to 250 °F; packing non-lubricated Buna-N
Trim / full-open Cv: 1/4" 1.8; 3/8" 4.0; 1/2" 6.4-6.5; 3/4" 14.1; 1" 20.5 (2" valves). 3/4" trim in a 1" valve is limited to 3000 psi differential
How to specify / order (part numbers by trim size, smallest first)
DSG-160-418 1" globe, ductile, 6000 psi: 80004316 / 80004320 / 80004312 / 80004330 (1/4"-3/4"; 45 lb)
DSG-240-418 2" globe, ductile, 4000 psi: 80004416 / 80004441 / 80004445 / 80004421 / 80004429 (1/4"-1"; 65 lb)
DSG-160-420 1" globe, steel, 6000 psi: 80004338 / 80004343 / 80004348 / 80004356 (50 lb)
DSG-260-420 2" globe, steel, 6000 psi: 80004456 / 80004461 / 80004466 / 80004476 / 80004480 (65 lb)
DSA-160-420 1" angle, steel, 6000 psi: 80004242 / 80004246 / 80004207 / 80004257 (45 lb)
DSA-230-420 2" angle, steel, 3000 psi: 80004270 / 80004275 / 80004280 / 80004290 / 80004294 (54 lb)
Specify model number, part number and trim description
Bulletin note: for the 2" models the Cg column lists only four values (52, 116, 409, 549) against five trim sizes, so the 1/2" Cg is missing and the column is misaligned; use Cv values and confirm Cg with the factory.
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 SSIN046 Rev 0.1 (11/18), pages 1-2; 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.