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The industry standard for common process flow stream pressures.

Series SF

Available in NPT threaded-end and flanged designs, these sight flow indicators meet most standard installation requirements. Made from single-piece cast-construction bodies, these SFIs are available with all four styles of Penberthy indication.

Models:

  • SF: NPT SFI (plain)
  • ​SFF: NPT SFI (Flapper)
  • SFR: NPT SFI (rotator)
  • SFD: NPT SFI (drip tube)
  • SF-F: Flanged SFI (plain)
  • SFR-F: Flanged SFI (rotator)
  • SFD-F: Flanged SFI (drip tube)

Materials of construction for body:

Standard:
  • ASTM A395 Gr. 60 – 40 – 18 Ductile Iron
  • ASTM B61 Bronze
  • ASTM A216 steel gr. WCB
  • ASTM A351 316L/316 STS gr. CF3M/CF8M
Optional:
  • ​ASTM 494 Monel® gr. M-30C
  • ASTM A494 Hastelloy ® C CW12MW
  • ASTM A734 Alloy 20 CN7M
  • Consult factory for other materials.

Series STW

A slender body with easy access windows is a popular alternative to traditional slight flow indicators.

Threaded window sight flow indicators are labelled with the company logo as well as pressure and temperature ratings. Available in NPT threaded-end designs, all threaded window sight flow indicator sizes meet ANSI 150 pressure class standards. They are available with all four styles of Penberthy indication.​

The threaded window design in an alternative style that is interchangeable with most applications using ANSI 150 pressure class sight flow indicators with bolt-on covers. Instead of unbolting the outer glass covers, these threaded windows are removed for cleaning or replacement with a spanner wrench. Spanner wrenches for removing windows are available. The spanner wrenches have a ½” drive socket to be used with a torque wrench.

Models:

STW: NPT threaded window SFI (plain)
STWF: NPT threaded window SFI (flapper)
STWR: NPT threaded window SFI (rotator)
STWD: NPT threaded window SFI (drip tube)

The windows are screwed into the single-piece cast sight flow body.

Materials of Construction for Body:

Standard: 
  • ASTM Bronze B61
  • ASTM A216 steel gr. WCB
  • ASTM A351 316/316L STS gr. CF3M/CF8M
Optional: 
  • ASTM 494 Monel gr. M-30C
  • ASTM A494 Hastelloy C CW12MW
  • ASTM A734 Alloy 20 CN7M
  • Consult factory for other materials.

Materials of Construction for Covers:

Brass and 316 stainless bar stock. All bodies are ANSI 150 pressure class regardless of size.