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1977621 ITEM 11 — VALVE,SAFETY RELIEF

✓ Government record, cited
— · GATE VALVE
PRODUCT OVERVIEW

1977621 ITEM 11: VALVE,SAFETY RELIEF.

The VALVE,SAFETY RELIEF is a the manufacturer industrial component. Key specifications include valve_operation_method: AUTOMATIC, media_for_which_designed: WATER, FRESH SINGLE RESPONSE. This part is cataloged in the U.S.

Government catalog under NSN 4820-01-326-0796, 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
1977621 ITEM 11
NSN: 4820-01-326-0796
FSC: 4820 — Valves, Nonpowered
CAGE: 03956 — NORTHROP GRUMMAN SYSTEMS CORPORATION (USA)
SPECIFICATIONS
valve_operation_methodAUTOMATIC
media_for_which_designedWATER, FRESH SINGLE RESPONSE
NSN4820-01-326-0796
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS — — SIZE: — · — · — PN: 1977621 ITEM 11 · 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
•
MEDIA FOR WHICH DESIGNED: WATER, FRESH SINGLE RESPONSE
•
VALVE OPERATION METHOD: AUTOMATIC
TECHNICAL CHARACTERISTICS
MEDIA FOR WHICH DESIGNEDWATER, FRESH SINGLE RESPONSE
VALVE OPERATION METHODAUTOMATIC
SUBSTITUTES & CROSS-REFERENCES 2
1808480Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
1977621Reference document
Same NSN cross-reference
Reference document — Secondary 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 1977621 ITEM 11?
1977621 ITEM 11 is a VALVE,SAFETY RELIEF.
What parts can replace 1977621 ITEM 11?
There are 2 known substitutes for 1977621 ITEM 11: 1808480, 1977621. Substitute compatibility should be verified for your specific system.
What is the NSN for 1977621 ITEM 11?
1977621 ITEM 11 is cataloged in the U.S. Government catalog under NSN 4820-01-326-0796. 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.