PartsTable
Technical Data Sheet

FV-4M1 1/2 — VALVE,SAFETY RELIEF

✓ Government record, cited
— · GATE VALVE
PRODUCT OVERVIEW

FV-4M1 1/2: VALVE,SAFETY RELIEF.

The VALVE,SAFETY RELIEF is a the manufacturer industrial component. Key specifications include special_features: BODY MATERIAL: BRASS; INLET CONNECTION SIZE: 0.5 INCHES IN, operating_pressure: 150.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS, maximum_operating_temp: 240.0 FAHRENHEIT SINGLE RESPONSE DEGF, minimum_operating_temp: 33.0 FAHRENHEIT DEGF, valve_operation_method: AUTOMATIC, thread_series_designator: NPT ALL ENDS. This part is cataloged in the U.S.

Government catalog under NSN 4820-01-715-7274, 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
FV-4M1 1/2
NSN: 4820-01-715-7274
FSC: 4820 — Valves, Nonpowered
CAGE: 79227 — WATTS REGULATOR COMPANY (USA)
SPECIFICATIONS
special_featuresBODY MATERIAL: BRASS; INLET CONNECTION SIZE: 0.5 INCHES IN
operating_pressure150.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS
maximum_operating_temp240.0 FAHRENHEIT SINGLE RESPONSE DEGF
minimum_operating_temp33.0 FAHRENHEIT DEGF
valve_operation_methodAUTOMATIC
thread_series_designatorNPT ALL ENDS
part_name_assigned_by_controlling_agencyVENT VALVE
NSN4820-01-715-7274
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS — — SIZE: — · — · — PN: FV-4M1 1/2 · 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
•
MINIMUM OPERATING TEMP: 33.0 FAHRENHEIT DEGF
•
OPERATING PRESSURE: 150.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS
•
MAXIMUM OPERATING TEMP: 240.0 FAHRENHEIT SINGLE RESPONSE DEGF
•
THREAD SERIES DESIGNATOR: NPT ALL ENDS
•
VALVE OPERATION METHOD: AUTOMATIC
TECHNICAL CHARACTERISTICS
MINIMUM OPERATING TEMP33.0 FAHRENHEIT DEGF
OPERATING PRESSURE150.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS
MAXIMUM OPERATING TEMP240.0 FAHRENHEIT SINGLE RESPONSE DEGF
SPECIAL FEATURESBODY MATERIAL: BRASS; INLET CONNECTION SIZE: 0.5 INCHES IN
PART NAME ASSIGNED BY CONTROLLING AGENCYVENT VALVE
THREAD SERIES DESIGNATORNPT ALL ENDS
VALVE OPERATION METHODAUTOMATIC
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 FV-4M1 1/2?
FV-4M1 1/2 is a VALVE,SAFETY RELIEF.
What is the NSN for FV-4M1 1/2?
FV-4M1 1/2 is cataloged in the U.S. Government catalog under NSN 4820-01-715-7274. 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.