PartsTable
Technical Data Sheet
Download PDF

B1990 — STEM,FLUID VALVE

✓ Government record, cited
— · GATE VALVE
PRODUCT OVERVIEW

B1990: STEM,FLUID VALVE.

The STEM,FLUID VALVE is a the manufacturer industrial component. Key specifications include material: COPPER ALLOY UNS C63200, stem_actuating_end_type: SQUARE, largest_outside_diameter: 0.688 INCHES NOMINAL IN, valve_size_for_which_designed: 3.0 INCHES IN, valve_type_for_which_designed: BALL, material_document_and_classification: MIL-B-24059 MIL SPEC SINGLE MATERIAL RESPONSE. This part is cataloged in the U.S.

Government catalog under NSN 4820-01-241-1321, 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
B1990
NSN: 4820-01-241-1321
NIINs: 012411321, 016156548
FSC: 4820 — Valves, Nonpowered
CAGE: 17062 — P J VALVES INC (USA)
SPECIFICATIONS
materialCOPPER ALLOY UNS C63200
stem_actuating_end_typeSQUARE
largest_outside_diameter0.688 INCHES NOMINAL IN
valve_size_for_which_designed3.0 INCHES IN
valve_type_for_which_designedBALL
material_document_and_classificationMIL-B-24059 MIL SPEC SINGLE MATERIAL RESPONSE
NSN4820-01-241-1321
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS — — SIZE: — · — · — PN: B1990 · 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
SUBSTITUTES & CROSS-REFERENCES 2
D1976PC4,3INReference document
Same NSN cross-reference
Reference document — Secondary reference
D1976Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
Demilitarization required (F)
Ready to buy B1990?
Compare prices from verified sellers on eBay
Buy on eBay →
As an eBay Partner, PartsTable may earn a commission. Your price is not affected.
FREQUENTLY ASKED QUESTIONS
What is B1990?
B1990 is a STEM,FLUID VALVE.
What parts can replace B1990?
There are 2 known substitutes for B1990: D1976PC4,3IN, D1976. Substitute compatibility should be verified for your specific system.
What is the NSN for B1990?
B1990 is cataloged in the U.S. Government catalog under NSN 4820-01-241-1321. This indicates validated use in U.S. government and defense supply chains.
Community Feedback
Leave a Comment
Comments are reviewed before appearing. You will receive an email to verify before your comment appears.

Request a Quote — B1990

✓ 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.