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MC21787 — SLEEVE AND SLIDE,DIRECTIONAL CON

✓ Government record, cited
— · GATE VALVE
PRODUCT OVERVIEW

MC21787: SLEEVE AND SLIDE,DIRECTIONAL CON.

SLEEVE AND SLIDE,DIRECTIONAL CON. Key specifications include special_features: INAVY) SLEEVE AND SLIDE,, end_item_identification: DIRECTIONAL CONTROL LINEAR VALVE, valve_design_control_activity: 76050, criticality_code_justification: AGAV, valve_model_number_for_which_designed: MC21878. This part is cataloged in the U.S.

Government catalog under NSN 4810-01-505-9878, 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
MC21787
NSN: 4810-01-505-9878
FSC: 4810 — Valves, Powered
CAGE: 76050 — EATON AEROSPACE LLC DBA STERER ENGINEERING DIV M.C.AEROSPACE (USA)
SPECIFICATIONS
special_featuresINAVY) SLEEVE AND SLIDE,
end_item_identificationDIRECTIONAL CONTROL LINEAR VALVE
valve_design_control_activity76050
criticality_code_justificationAGAV
valve_model_number_for_which_designedMC21878
NSN4810-01-505-9878
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS — — SIZE: — · — · — PN: MC21787 · 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 MODEL NUMBER FOR WHICH DESIGNED: MC21878
•
CRITICALITY CODE JUSTIFICATION: AGAV
•
VALVE DESIGN CONTROL ACTIVITY: 76050
TECHNICAL CHARACTERISTICS
VALVE MODEL NUMBER FOR WHICH DESIGNEDMC21878
CRITICALITY CODE JUSTIFICATIONAGAV
SPECIAL FEATURESINAVY) SLEEVE AND SLIDE,
VALVE DESIGN CONTROL ACTIVITY76050
END ITEM IDENTIFICATIONDIRECTIONAL CONTROL LINEAR VALVE
OTHER ITEMS IN FSC 4810 — Valves, Powered
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
4810-00-001-1247 4810-00-001-4499 4810-00-001-4531 4810-00-001-4532 4810-00-001-4554 4810-00-001-4555 4810-00-001-4556 4810-00-001-4611
SUBSTITUTES & CROSS-REFERENCES

No substitute or cross-reference records for this part.

LIFECYCLE
NSN statusActive· U.S. Government catalog
Demilitarization required — critical (Q)
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FREQUENTLY ASKED QUESTIONS
What is MC21787?
MC21787 is a SLEEVE AND SLIDE,DIRECTIONAL CON.
What is the NSN for MC21787?
MC21787 is cataloged in the U.S. Government catalog under NSN 4810-01-505-9878. 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.