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51310B91 — DISK,VALVE

✓ Government record, cited
— · GATE VALVE
PRODUCT OVERVIEW

51310B91: DISK,VALVE.

The DISK,VALVE is a the manufacturer industrial component. Key specifications include material: STEEL CORROSION RESISTING, pressure_rating: 150.0 POUNDS PER SQUARE INCH (PSI) NOMINAL LBS, outside_diameter: 7.810 INCHES NOMINAL IN, style_designator: BUTTERFLY, end_item_identification: NORRIS/O'BANNON 8.000 IN. BUTTERFLY VALVE MODEL NO.

285A A. This part is cataloged in the U.S. Government catalog under NSN 4820-01-353-7678, 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
51310B91
NSN: 4820-01-353-7678
FSC: 4820 — Valves, Nonpowered
CAGE: 1NB39 — DOVER RESOURCES, INC. DIV NORRISEAL (USA)
SPECIFICATIONS
materialSTEEL CORROSION RESISTING
pressure_rating150.0 POUNDS PER SQUARE INCH (PSI) NOMINAL LBS
outside_diameter7.810 INCHES NOMINAL IN
style_designatorBUTTERFLY
end_item_identificationNORRIS/O'BANNON 8.000 IN. BUTTERFLY VALVE MODEL NO. 285A A
NSN4820-01-353-7678
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS — — SIZE: — · — · — PN: 51310B91 · 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
•
PRESSURE RATING: 150.0 POUNDS PER SQUARE INCH (PSI) NOMINAL LBS
•
OUTSIDE DIAMETER: 7.810 INCHES NOMINAL IN
•
STYLE DESIGNATOR: BUTTERFLY
•
MATERIAL: STEEL CORROSION RESISTING
TECHNICAL CHARACTERISTICS
PRESSURE RATING150.0 POUNDS PER SQUARE INCH (PSI) NOMINAL LBS
OUTSIDE DIAMETER7.810 INCHES NOMINAL IN
STYLE DESIGNATORBUTTERFLY
END ITEM IDENTIFICATIONNORRIS/O'BANNON 8.000 IN. BUTTERFLY VALVE MODEL NO. 285A A
MATERIALSTEEL CORROSION RESISTING
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 2
51310B391Reference document
Same NSN cross-reference
Reference document — Advisory reference — outside the item-of-supply concept
920-219 ITEM 2Reference 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 51310B91?
51310B91 is a DISK,VALVE.
What parts can replace 51310B91?
There are 2 known substitutes for 51310B91: 51310B391, 920-219 ITEM 2. Substitute compatibility should be verified for your specific system.
What is the NSN for 51310B91?
51310B91 is cataloged in the U.S. Government catalog under NSN 4820-01-353-7678. 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.