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Pipe-Lok Vales & Fittings Company delivers precision-engineered instrumentation fittings and valves trusted for reliability, safety, and performance in industrial applications with a strong focus on engineering excellence and quality control.

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Pressure Relief Valves

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Technical Specifications for Pressure Relief Valves

Design & Body Configuration
DESIGN TYPE: ANGLE TYPE & STRAIGHT BODY TYPE: FORGED, BAR STOCK SPRING: COLOURED SPRING FOR DIFFERENT SET PRESSURES EQUIVALENT BRAND: SWAGELOK, PARKER
Pressure & Temperature Ratings
PRESSURE RATING: UPTO 10,000 PSI (700 BAR) SET PRESSURES: 15 PSI TO 10,000 PSI / 1 BAR TO 700 BAR TEMPERATURE RATING: (-30) DEG C TO +350 DEG CELCIUS
Size & End Connections
SIZE RANGE: 1/8" TO 2" & 3 MM TO 50 MM CONNECTION TYPE: THREADED, TUBE FITTING, FLANGE END, BUTTWELD & SOCKETWELD THREAD TYPE: NPT, BSPP, BSPT, METRIC & OTHER
Materials & Seals
MATERIALS: DUPLEX, SUPER DUPLEX, HASTELLOY, INCONEL, MONEL, ALLOY 20, TITANIUM, 6MO, PTFE, PP, TANTALUM, ZIRCONIUM, NIOBIUM, ALLOY 28, ALUMINUM, BRONZE, BRASS, COPPER, CUPRO NICKEL, SS 304, SS 316, SS 316TI, SS 310, SS904L & MANY OTHER GRADES SEAL MATERIAL: VITON (FKM), PTFE, NITRILE (NBR), EPDM, SILICONE, PEEK, METAL SEAT, NEOPRENE, FFKM
Finish & Testing Compliance
SURFACE FINISH: ELECTROPLATED, SHOT BLASTED TRACEABILITY: MATERIAL GRADE, SET PRESSURE, CONNECTION SIZE, LOT NUMBER NACE CERTIFICATION: ON REQUEST
Drawing / Datasheet
ON REQUEST
Performance Categories

Pressure Relief Valve Ranges

Operational Classifications
High Pressure Pressure Relief Valve
Low Pressure Pressure Relief Valve
Bar Rated Specifications
1 Bar to 1000 Bar Pressure Relief Valve
400 Bar Pressure Relief Valve
1000 Bar Pressure Relief Valve
PSI Rated Specifications
10 PSI to 15000 PSI Pressure Relief Valve
6000 PSI Pressure Relief Valve
15000 PSI Pressure Relief Valve

Types of Pressure Relief Valves

High-Performance Flow & Safety Instrumentation Solutions

Male x Female Pressure Relief Valve
Male x Female Pressure Relief Valve
Tube End Pressure Relief Valve
Tube End Pressure Relief Valve
Female x Female Pressure Relief Valve
Female x Female Pressure Relief Valve
Flanged Pressure Relief Valve
Flanged Pressure Relief Valve

Pressure Relief Valve Grade Index

High-performance material specifications for our complete Pressure Relief Valve range.

Duplex 2205 Super Duplex 2507 Super Duplex 2506 Hastelloy C276 Hastelloy C22 Hastelloy B2 Monel 400 Monel K500 Inconel 600 Inconel 625 Inconel 718 Inconel 800 Inconel 825 Titanium Grade 2 Titanium Grade 5 Cupro Nickel 90/10 Cupro Nickel 70/30 Alloy 20 6Mo Alloy PTFE PP Tantalum Zirconium Niobium Alloy 28 Aluminum Bronze Brass Copper SS 304 SS 316 SS 316Ti SS 310 SS 904L

Technical Ordering Configuration

Follow the Pipe-Lok Vales & Fittings Standard Format to build your specific pressure relief valve part number

Standard Ordering Format
PL
—
PRV
—
6
—
SS316
—
M/FNPT
—
1000
—
VITON

Example: 3/8" Pressure Relief Valve, SS316, 3/8" M/FNPT, 1000 PSI Set Pressure, Viton

Type & Port Size
Valve Type:
  • PRV: Pressure Relief Valve
Tube OD / Port Size:
2 = 1/8"
4 = 1/4"
6 = 3/8"
8 = 1/2"
12 = 3/4"
16 = 1"
Material & Connection
Body Material:

SS304, SS316, SS316Ti, 6MO, DUPLEX, SOUPLEX, INCONEL, MONEL, HASTELLOY, ALLOY20 OR ANY OTHER

Connection Type:
TF (Tube Fitting) FNPT MNPT BSPP BSPT BW (Butt Weld) SW (Socket Weld) VCR
Pressure & Seat
Factory Set Pressure (PSI):
50 100 500 1000 3000 6000 10000
*OR ANY OTHER
Seat Material:
SOFT METAL PTFE PEEK VITON
Example Orders:
Standard Pressure Relief Valve: PL-PRV-6-SS316-6FNPT-1000-SOFT = 3/8" Pressure Relief Valve, SS316, 3/8" M/FNPT, 1000 PSI Set Pressure, Viton
Engineering Guide

Seal Material Selection According to Media

Optimize pressure relief valve performance and lifespan by matching recommended soft or metal seal substrates to your specific process environments.

Media / Application Recommended Seal Material Remarks / Engineering Notes
Air NBR, EPDM General industrial use
Compressor Air NBR, Viton High pressure systems
Water EPDM, NBR EPDM preferred for hot water
Hot Water EPDM Excellent heat & steam resistance
Steam EPDM, Graphite, Metal Seat Avoid NBR/PTFE at very high steam temp
Hydraulic Oil NBR, Viton Most common selection
Petroleum Oil Viton, NBR Viton better for high temperature
Diesel Viton Excellent fuel resistance
Petrol / Gasoline Viton Hydrocarbon resistant
LPG Viton, PTFE Gas compatibility
Natural Gas Viton, PTFE Common in gas PRVs
Oxygen Service PTFE Oxygen-clean service required
Nitrogen NBR, PTFE Inert gas application
Hydrogen PTFE, Viton High permeation resistance needed
Ammonia EPDM Avoid Viton in ammonia
Chlorine PTFE, Kalrez Highly corrosive media
Acidic Chemicals PTFE, Kalrez Excellent chemical resistance
Caustic Chemicals PTFE, EPDM Depends on concentration
Solvents PTFE, Kalrez Broad chemical compatibility
Food & Beverage Silicone, PTFE FDA grade materials preferred
Pharmaceutical PTFE, Silicone Hygienic applications
Cryogenic Service PTFE, PCTFE Low-temperature flexibility
High Temperature Gas Metal Seat, Graphite Above soft seal limits
High Pressure Service PEEK, PTFE Better mechanical strength

Swagelok® Equivalent Pressure Relief Valve Part Numbers

Pipe-Lok Vales & Fittings manufactures high-quality alternatives to the following standard industry part numbers

Swagelok Part No. Pipe-Lok Vales & Fittings Equivalent Availability
SS-4R3AAvailable Ready to Ship
SS-4R3A1Available Ready to Ship
SS-4R3A5Available Ready to Ship
SS-4R3A5-BUAvailable Ready to Ship
SS-4R3A5-EPAvailable Ready to Ship
SS-4R3A5-KZAvailable Ready to Ship
SS-4R3A5-NEAvailable Ready to Ship
SS-4R3A5-RTAvailable Ready to Ship
SS-4R3A-BUAvailable Ready to Ship
SS-4R3A-EPAvailable Ready to Ship
SS-4R3A-KZAvailable Ready to Ship
SS-6R3A-MMAvailable Ready to Ship
SS-8R3A-MMAvailable Ready to Ship
SS-R4M8F8Available Ready to Ship
SS-R4M8S8Available Ready to Ship
SS-R4S8Available Ready to Ship
SS-R4S12MMAvailable Ready to Ship
SS-RL3M4-F4Available Ready to Ship
SS-RL3M4F4-RTAvailable Ready to Ship
SS-RL3M4-S4Available Ready to Ship
SS-RL3S4Available Ready to Ship
SS-RL3S4-SC11Available Ready to Ship
SS-RL3S4-EPAvailable Ready to Ship
SS-RL3S4-MOAvailable Ready to Ship
SS-RL3S4-KZ-11002Available Ready to Ship
SS-RL3S6MMAvailable Ready to Ship
SS-RL3S8MMAvailable Ready to Ship
SS-RL4M8F8Available Ready to Ship
SS-RL4MR8Available Ready to Ship
SS-RL4S8Available Ready to Ship
SS-RL4S12MMAvailable Ready to Ship
*Swagelok is a registered trademark. Pipe-Lok Vales & Fittings is not affiliated with Swagelok but provides compatible, high-performance equivalents.

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