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A31999 — VALVE CORE

✓ Government record, cited
— · GATE VALVE
PRODUCT OVERVIEW

A31999: VALVE CORE.

The VALVE CORE is a the manufacturer industrial component. Key specifications include special_features: TO BE USED ON 0.25 INCH ACCESS VALVES IN, core_environmental_protection: OIL RESISTANT, commercial_core_length_designator: STANDARD, part_name_assigned_by_controlling_agency: REPLACEMENT VALVE CORE. This part is cataloged in the U.S.

Government catalog under NSN 4820-01-592-6253, 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
A31999
NSN: 4820-01-592-6253
FSC: 4820 — Valves, Nonpowered
CAGE: 7S444 — JB INDUSTRIES, INC. (USA)
SPECIFICATIONS
special_featuresTO BE USED ON 0.25 INCH ACCESS VALVES IN
unit_package_quantity5
core_environmental_protectionOIL RESISTANT
commercial_core_length_designatorSTANDARD
part_name_assigned_by_controlling_agencyREPLACEMENT VALVE CORE
NSN4820-01-592-6253
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS — — SIZE: — · — · — PN: A31999 · 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
•
CORE ENVIRONMENTAL PROTECTION: OIL RESISTANT
•
UNIT PACKAGE QUANTITY: 5
•
COMMERCIAL CORE LENGTH DESIGNATOR: STANDARD
TECHNICAL CHARACTERISTICS
CORE ENVIRONMENTAL PROTECTIONOIL RESISTANT
UNIT PACKAGE QUANTITY5
SPECIAL FEATURESTO BE USED ON 0.25 INCH ACCESS VALVES IN
PART NAME ASSIGNED BY CONTROLLING AGENCYREPLACEMENT VALVE CORE
COMMERCIAL CORE LENGTH DESIGNATORSTANDARD
SUBSTITUTES & CROSS-REFERENCES 2
500K3645Reference document
Same NSN cross-reference
Reference document — Design control — primary reference
207161Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
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 A31999?
A31999 is a VALVE CORE.
What parts can replace A31999?
There are 2 known substitutes for A31999: 500K3645, 207161. Substitute compatibility should be verified for your specific system.
What is the NSN for A31999?
A31999 is cataloged in the U.S. Government catalog under NSN 4820-01-592-6253. 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.