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B1988 — STEM,FLUID VALVE

✓ Government record, cited
— · GATE VALVE
PRODUCT OVERVIEW

B1988: 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: 0.188 INCHES NOMINAL IN, valve_size_for_which_designed: 2.0 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 4820-01-615-6556, 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
B1988
NSN: 4820-01-615-6556
FSC: 4820 — Valves, Nonpowered
CAGE: 11859 — HUNT VALVE COMPANY, INC. (USA)
SPECIFICATIONS
materialCOPPER ALLOY UNS C63200
stem_actuating_end_typeSQUARE
largest_outside_diameter0.188 INCHES NOMINAL IN
valve_size_for_which_designed2.0 INCHES IN
valve_type_for_which_designedBALL
material_document_and_classificationMIL-B-24059 MIL SPEC SINGLE MATERIAL RESPONSE
NSN4820-01-615-6556
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS — — SIZE: — · — · — PN: B1988 · 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
•
VALVE TYPE FOR WHICH DESIGNED: BALL
•
LARGEST OUTSIDE DIAMETER: 0.188 INCHES NOMINAL IN
•
STEM ACTUATING END TYPE: SQUARE
•
MATERIAL DOCUMENT AND CLASSIFICATION: MIL-B-24059 MIL SPEC SINGLE MATERIAL RESPONSE
•
VALVE SIZE FOR WHICH DESIGNED: 2.0 INCHES IN
•
MATERIAL: COPPER ALLOY UNS C63200
TECHNICAL CHARACTERISTICS
VALVE TYPE FOR WHICH DESIGNEDBALL
LARGEST OUTSIDE DIAMETER0.188 INCHES NOMINAL IN
STEM ACTUATING END TYPESQUARE
MATERIAL DOCUMENT AND CLASSIFICATIONMIL-B-24059 MIL SPEC SINGLE MATERIAL RESPONSE
VALVE SIZE FOR WHICH DESIGNED2.0 INCHES IN
MATERIALCOPPER ALLOY UNS C63200
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 1
D1976 PC NO 4 2.0INReference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is B1988?
B1988 is a STEM,FLUID VALVE.
What parts can replace B1988?
There is 1 known substitute for B1988: D1976 PC NO 4 2.0IN. Substitute compatibility should be verified for your specific system.
What is the NSN for B1988?
B1988 is cataloged in the U.S. Government catalog under NSN 4820-01-615-6556. 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.