F84L (Balanced) Liquid Service

Brand: Flow Safe, Inc

Balanced style SRV’s for liquid service. Balanced against the effects of backpressure without bellows. Made in accordance with ASME Section VIII or “CE” mark. Initial modulation at low flow with fixed blowdown.

Available in carbon or stainless steel materials as standard. Special alloy construction available upon request. Plastic seated with a variety of elastomer seal materials and connection styles available.
Features
  • Spring-operated, modulating at low flow
  • Soft seated fully balanced against backpressure without bellows
  • Pressure assisted drag seal for smooth operation
  • Full lift at 7.5% overpressure
  • Leak tight seating and re-seating
  • Fixed blowdown
  • Integral / full nozzle, 316/316L corrosion resistant trim
  • Packed lift lever available on most sizes

Specifications

Connection Sizes

  • 1/2" × 1" - 2" × 3" (13 mm × 25 mm - 50 mm × 75 mm)

Set Pressure Ranges

  • 30 - 24,277 psig (2.1 - 1674 barg)

Temperature Ranges

  • -65° to 525° F (-54° to 274° C)

Orifice Area Range

  • .015 - 1.689 in²

End Connections

  • Threaded: NPT, SAE, MS33649/AS5202, AN 37° Flare
  • Welded: ASME / DIN / API / SAE flanged, Grayloc
  • Specialty: Swagelok Tube / VCR, Threaded & Coned

Materials of Construction

  • Carbon Steel, Stainless Steel, Monel, Hastelloy C / C22 / C-276, Duplex 22 % or 25 % Cr

Seat/Seal Materials

  • Seat Material (Plastic): Teflon, Ekonol-filled PTFE, Kel-F (PCTFE), PI/PAI (Vespel, Duratron, or equal), PEEK
  • Spindle Seal Material (Elastomer): Buna-N, Viton (FKM) or equal, EPR/EPDM, FFKM (Chemraz, Kalrez, etc), Polyurethane, HNBR

Certifications & Compliance

  • ASME Sec VIII Div. 1 (NB-18 Cert. No. 28044, 28055, 28123, 28145, 28167)
  • API 520 (Sizing & Selection of PRV’s) / API 527 (Seat tightness of PRV’s)
  • Superior flow capability (KA factor) vs. equivalent API 526 orifice
  • API 526 center-to-face dimensions available on most sizes
  • NACE MR0175 H₂S compliant materials available on request
  • PED / CE (2014/68/EU) compliant on request
  • Canadian CRN (All Provinces per CSA B51)
  • ABS Product Design Assessment (Cert. No. 15-HS1393800-PDA)

  • Lube Oil Systems
  • Water Systems
  • Chemical Processing
  • Thermal Relief
  • High-Pressure Temper Quench Systems
  • Installations with High Outlet Backpressures
  • Positive Displacement Pumps
Show More