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SS-4R3A-BU — VALVE,SAFETY RELIEF

✓ Government record, cited
— · GATE VALVE
PRODUCT OVERVIEW

SS-4R3A-BU: VALVE,SAFETY RELIEF.

The VALVE,SAFETY RELIEF is a the manufacturer industrial component. Key specifications include material: STEEL COMP 316 BODY, special_features: CONNECTION 1 SIZE 1/4IN, CONNECTION 2 SIZE 1/4IN, SWAGELOK TUBE FITTING, BUNA N SEAL, IN, operating_pressure: 6000.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS, nominal_thread_size: 0.250 INCHES ALL ENDS IN, maximum_operating_temp: 250.0 FAHRENHEIT SINGLE RESPONSE DEGF, part_name_assigned_by_controlling_agency: PROPORTIONAL RELIEF VALVE, HIGH PRESSURE. This part is cataloged in the U.S.

Government catalog under NSN 4820-01-672-7865, indicating validated use in U.S. government and defense logistics supply chains. Available through authorized enterprise resellers and TPM (Third Party Maintenance) channels.

Verify compatibility with your specific system configuration before ordering.

WHERE IT FITS
SS-4R3A-BU
NSN: 4820-01-672-7865
FSC: 4820 — Valves, Nonpowered
CAGE: 3T9T9 — SWAGELOK CO (USA)
SPECIFICATIONS
materialSTEEL COMP 316 BODY
special_featuresCONNECTION 1 SIZE 1/4IN, CONNECTION 2 SIZE 1/4IN, SWAGELOK TUBE FITTING, BUNA N SEAL, IN
operating_pressure6000.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS
nominal_thread_size0.250 INCHES ALL ENDS IN
maximum_operating_temp250.0 FAHRENHEIT SINGLE RESPONSE DEGF
part_name_assigned_by_controlling_agencyPROPORTIONAL RELIEF VALVE, HIGH PRESSURE
NSN4820-01-672-7865
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS — — SIZE: — · — · — PN: SS-4R3A-BU · OEM ⚠ VERIFY BEFORE ORDERING Gate valves = FULL OPEN or FULL CLOSE only — never throttle. Partial opening causes seat erosion and vibration. ✓ BROKER TIP Rising stem shows valve position visually — easier maintenance. Non-rising stem saves headroom. PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
•
OPERATING PRESSURE: 6000.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS
•
NOMINAL THREAD SIZE: 0.250 INCHES ALL ENDS IN
•
MAXIMUM OPERATING TEMP: 250.0 FAHRENHEIT SINGLE RESPONSE DEGF
•
MATERIAL: STEEL COMP 316 BODY
TECHNICAL CHARACTERISTICS
OPERATING PRESSURE6000.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS
NOMINAL THREAD SIZE0.250 INCHES ALL ENDS IN
MAXIMUM OPERATING TEMP250.0 FAHRENHEIT SINGLE RESPONSE DEGF
SPECIAL FEATURESCONNECTION 1 SIZE 1/4IN, CONNECTION 2 SIZE 1/4IN, SWAGELOK TUBE FITTING, BUNA N SEAL, IN
PART NAME ASSIGNED BY CONTROLLING AGENCYPROPORTIONAL RELIEF VALVE, HIGH PRESSURE
MATERIALSTEEL COMP 316 BODY
OTHER ITEMS IN FSC 4820 — Valves, Nonpowered
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
4820-00-000-0097 4820-00-001-0010 4820-00-001-0020 4820-00-001-0021 4820-00-001-0032 4820-00-001-0037 4820-00-001-0042 4820-00-001-1230
SUBSTITUTES & CROSS-REFERENCES

No substitute or cross-reference records for this part.

LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is SS-4R3A-BU?
SS-4R3A-BU is a VALVE,SAFETY RELIEF.
What is the NSN for SS-4R3A-BU?
SS-4R3A-BU is cataloged in the U.S. Government catalog under NSN 4820-01-672-7865. This indicates validated use in U.S. government and defense supply chains.
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✓ PartsTable — the parts reference. Every fact cited to its source.
PartsTable Design LLC · partstable.com
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.
PartsTable commercial catalog: edition Unified commercial catalog snapshot through 2026-09-28, edition date not on file, retrieved 2026-09-28.