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639AS2988 — HOLDER,VALVE BLEED DOWN FIXTURE

✓ Government record, cited
— · GATE VALVE
PRODUCT OVERVIEW

639AS2988: HOLDER,VALVE BLEED DOWN FIXTURE.

HOLDER,VALVE BLEED DOWN FIXTURE. Key specifications include general_characteristics_item_description: BRASS QQ-B-637 ALLOY 482 1/2 HARD,2 IN. LG,1.500 IN.

W,0.500 IN. H,DESIGNED TO HOLD 2 VALVES IN. This part is cataloged in the U.S.

Government catalog under NSN 4820-01-108-0247, 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
639AS2988
NSN: 4820-01-108-0247
FSC: 4820 — Valves, Nonpowered
CAGE: 30003 — NAVAL AIR SYSTEMS COMMAND MANAGED ORIGINAL DESIGN ACTIVITY NOT MATERIAL/PARTS SUPPLIER (USA)
SPECIFICATIONS
general_characteristics_item_descriptionBRASS QQ-B-637 ALLOY 482 1/2 HARD,2 IN. LG,1.500 IN. W,0.500 IN. H,DESIGNED TO HOLD 2 VALVES IN
NSN4820-01-108-0247
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS — — SIZE: — · — · — PN: 639AS2988 · 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
•
GENERAL CHARACTERISTICS ITEM DESCRIPTION: BRASS QQ-B-637 ALLOY 482 1/2 HARD,2 IN. LG,1.500 IN. W,0.500 IN. H,DESIGNED TO HOLD 2 VALVES IN
TECHNICAL CHARACTERISTICS
GENERAL CHARACTERISTICS ITEM DESCRIPTIONBRASS QQ-B-637 ALLOY 482 1/2 HARD,2 IN. LG,1.500 IN. W,0.500 IN. H,DESIGNED TO HOLD 2 VALVES IN
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 639AS2988?
639AS2988 is a HOLDER,VALVE BLEED DOWN FIXTURE.
What is the NSN for 639AS2988?
639AS2988 is cataloged in the U.S. Government catalog under NSN 4820-01-108-0247. 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.