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

Spring Operated Safety Relief Valves (ASME)

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
Al plastic seat & seals for process compatibility
nstallations 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