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521-0054 — PARTS KIT,DIAPHRAGM REPLACEMENT

✓ Government record, cited
— · GATE VALVE
PRODUCT OVERVIEW

521-0054: PARTS KIT,DIAPHRAGM REPLACEMENT.

PARTS KIT,DIAPHRAGM REPLACEMENT. Key specifications include document_type: CATALOG SHEET, special_features: USED ON GENERATOR AND VARIOUS DIESEL ENGINES,HIGHT:0.85 INCH NOMINAL,OYTSIDE DIAMETER:3.6 INCH NOMINAL IN, component_document_origin: INDUSTRIAL, part_name_assigned_by_controlling_agency: PARTS KIT,DIAPHRAGM. This part is cataloged in the U.S.

Government catalog under NSN 4820-01-696-8627, 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
521-0054
NSN: 4820-01-696-8627
FSC: 4820 — Valves, Nonpowered
CAGE: 11083 — CATERPILLAR INC DIV CATERPILLAR DEFENSE (USA)
SPECIFICATIONS
document_typeCATALOG SHEET
special_featuresUSED ON GENERATOR AND VARIOUS DIESEL ENGINES,HIGHT:0.85 INCH NOMINAL,OYTSIDE DIAMETER:3.6 INCH NOMINAL IN
component_document_originINDUSTRIAL
part_name_assigned_by_controlling_agencyPARTS KIT,DIAPHRAGM
NSN4820-01-696-8627
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS — — SIZE: — · — · — PN: 521-0054 · 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
•
DOCUMENT TYPE: CATALOG SHEET
•
COMPONENT DOCUMENT ORIGIN: INDUSTRIAL
TECHNICAL CHARACTERISTICS
DOCUMENT TYPECATALOG SHEET
COMPONENT DOCUMENT ORIGININDUSTRIAL
SPECIAL FEATURESUSED ON GENERATOR AND VARIOUS DIESEL ENGINES,HIGHT:0.85 INCH NOMINAL,OYTSIDE DIAMETER:3.6 INCH NOMINAL IN
PART NAME ASSIGNED BY CONTROLLING AGENCYPARTS KIT,DIAPHRAGM
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 521-0054?
521-0054 is a PARTS KIT,DIAPHRAGM REPLACEMENT.
What is the NSN for 521-0054?
521-0054 is cataloged in the U.S. Government catalog under NSN 4820-01-696-8627. 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.