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D49918 — VALVE,SAFETY RELIEF

✓ Government record, cited
— · GATE VALVE
PRODUCT OVERVIEW

D49918: VALVE,SAFETY RELIEF.

The VALVE,SAFETY RELIEF is a the manufacturer industrial component. Key specifications include material: PLASTIC POLYTETRAFLUOROETHYLENE PACKING, valve_size: 3.000 INCHES IN, bonnet_type: INSIDE SPRING, flange_shape: ROUND WITH HOLES ALL ENDS, overall_height: 3.930 INCHES NOMINAL IN, connection_type: FLANGE ALL ENDS. This part is cataloged in the U.S.

Government catalog under NSN 4820-01-169-1977, 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
D49918
NSN: 4820-01-169-1977
NIINs: 011691977, 011714393, 011958424, 013164569
FSC: 4820 — Valves, Nonpowered
CAGE: 34889 — HUNT VALVE COMPANY INC DBA UNION FLONETICS (USA)
SPECIFICATIONS
materialPLASTIC POLYTETRAFLUOROETHYLENE PACKING
valve_size3.000 INCHES IN
bonnet_typeINSIDE SPRING
flange_shapeROUND WITH HOLES ALL ENDS
overall_height3.930 INCHES NOMINAL IN
connection_typeFLANGE ALL ENDS
inside_diameter4.000 INCHES NOMINAL IN
outside_diameter4.370 INCHES NOMINAL IN
style_designatorANGLE FLANGED ENDS
features_providedPRESSURE TIGHT OUTLET SIDE
nominal_thickness0.500 INCHES ALL ENDS IN
bolt_hole_quantity8 ALL ENDS
NSN4820-01-169-1977
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS — — SIZE: — · — · — PN: D49918 · 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
•
OUTSIDE DIAMETER: 4.370 INCHES NOMINAL IN
•
INSIDE DIAMETER: 4.000 INCHES NOMINAL IN
•
MATERIAL: NICKEL ALLOY
TECHNICAL CHARACTERISTICS
OVERALL HEIGHT3.930 INCHES NOMINAL IN
OUTSIDE DIAMETER4.370 INCHES NOMINAL IN
INSIDE DIAMETER4.000 INCHES NOMINAL IN
MATERIALNICKEL ALLOY
SUBSTITUTES & CROSS-REFERENCES 3
D49918 ITEM 5Reference document
Same NSN cross-reference
Reference document — Secondary reference
A49531-2Reference document
Same NSN cross-reference
Reference document — Secondary reference
A49531-2MFDReference document
Same NSN cross-reference
Reference document — Design control — primary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Insurance item — stocked against contingency demandNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is D49918?
D49918 is a VALVE,SAFETY RELIEF.
What parts can replace D49918?
There are 3 known substitutes for D49918: D49918 ITEM 5, A49531-2, A49531-2MFD. Substitute compatibility should be verified for your specific system.
What is the NSN for D49918?
D49918 is cataloged in the U.S. Government catalog under NSN 4820-01-169-1977. 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.