Direct Spring, Balanced

Direct Spring, Balanced

Spring Operated Safety Relief Valves (ASME)

F84L (Balanced): Liquid Service

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 seatedFully 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

APPLICATIONS

  • Lube oil systems
  • Water systems
  • Chemical processing
  • Thermal relief
  • High-pressure temper quench systems
  • Installations with high outlet backpressures
  • Positive displacement pumps

Service Envelope

Connection Sizes
Larger sizes available on request		½” x 1” - 2” x 3”
(13mm x 25mm - 50mm x 75 mm)
Set Pressure Ranges
See F84L Catalog for orifice specific ratings		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
(9.7 – 1089 mm2)
End Connections
Custom types available on request		Threaded: NPT, SAE, MS33649/AS5202, AN 37° Flare
Welded: ASME / DIN / API / SAE flanged, Grayloc
Specialty: Swagelok® Tube / VCR, Threaded & Coned
Materials of Construction
Custom available for service or on request		Carbon Steel, Stainless Steel, Monel, Hastelloy C / C22 / C276, Duplex 22% or 25% Cr
Seat/Seal Materials
Custom available for service or on request		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)

Spring Operated Safety Relief Valves (ASME)

F88 (Balanced): Gas / Liquid / 2-Phase Service

Balanced 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, snap-acting (gas) or modulating (liquid, low flow)
  • Soft seated w/ 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

APPLICATIONS

  • Variable gas or liquid service
  • Mixed phase applications
  • Cryogenic fluids
  • Chemical processing
  • All plastic seat & seals for process compatibility
  • Installations with high outlet backpressures

Service Envelope

Connection Sizes
Custom sizes available on request		½” x ½” - 2” x 3”
(13mm x 13mm - 50mm x 75 mm)
Set Pressure Ranges
See F88 Gas or Liquid Catalog for orifice specific ratings		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
Custom types available on request		Threaded: NPT, SAE, MS33649/AS5202, AN 37° Flare
Welded: ASME / DIN / API / SAE flanged, Grayloc
Specialty: Swagelok® Tube / VCR, Threaded & Coned
Materials of Construction
Custom available for service or on request		Carbon Steel, Stainless Steel, Monel, Hastelloy C / C22 / C276, Duplex 22% or 25% Cr
Seat/Seal Materials
Custom available for service or on request		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

  • ASME Sec VIII Div. 1 (NB-18 Cert. No. 28044, 28055,28077, 28088, 28101, 28112, 28134, 28145)
  • 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)
  • US Patent No. 7,513,270