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F88 (Balanced): Gas / Liquid / 2-Phase Service
Brand: Flow Safe, IncBalanced style SRV’s for gas, liquid, or mixed phase service. Balanced against the effects of backpressure without bellows.
Made in accordance with ASME Section VIII or “CE” mark. Pop action on gas; initial modulation on liquid with fixed blowdown. Available in carbon or stainless steel materials as standard.
Special alloy construction available upon request. Plastic seat/seals with various connection styles available.
Features- Spring-operated, modulating at low flow
- Soft seated with backup metal-to-metal seat
- Fully balanced against backpressure without bellows
- Spring energizing V-seal for smooth operation
- Full lift: Gas = Set pressure, Liquid = 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
Brand
Connection Sizes
- 1/2" x 1/2" - 2" x 3" (13 mm x 13 mm - 50 mm x 75 mm)
Set Pressure Ranges
- 30 - 8,382 psig (2.1 - 578 barg)
Temperature Ranges
- -423° to 400° F (-252° to 204° C)
Orifice Area Range
- .065 - 1.689 in² (41.9 - 1089 mm²)
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 (Plastic): Spring-energized Teflon V-Seal
Certifications & Compliance
- 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 MR-0175 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)
- ASME Sec VIII, Div. 1 (NB-18 Cert. No. 28044, 28055, 28077, 28088, 28101, 28112, 28134, 28145)
- US Patent No. 7,513,270
- Variable Gas or Liquid Service
- Mixed Phase Applications
- Cryogenic Fluids
- Chemical Processing
- All Plastic Seat & Seals for Process Compatibility
- Installations with High Outlet Backpressures