PartsTable
Technical Data Sheet
Download PDF

255770PC18 — SEAT,VALVE

✓ Government record, cited
— · GATE VALVE
PRODUCT OVERVIEW

255770PC18: SEAT,VALVE.

The SEAT,VALVE is a the manufacturer industrial component. Key specifications include material: PLASTIC OVERALL, overall_height: 0.875 INCHES NOMINAL IN, style_designator: PLAIN, seat_angle_in_deg: 43.000 MINIMUM AND 47.000 MAXIMUM, body_inside_diameter: 5.875 INCHES NOMINAL IN, body_outside_diameter: 8.500 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 4820-00-360-8823, 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
255770PC18
NSN: 4820-00-360-8823
FSC: 4820 — Valves, Nonpowered
CAGE: 43689 — HUNTINGTON INGALLS INC DIV NEWPORT NEWS SHIPBUILDING (USA)
SPECIFICATIONS
materialPLASTIC OVERALL
overall_height0.875 INCHES NOMINAL IN
style_designatorPLAIN
seat_angle_in_deg43.000 MINIMUM AND 47.000 MAXIMUM
body_inside_diameter5.875 INCHES NOMINAL IN
body_outside_diameter8.500 INCHES NOMINAL IN
seating_surface_shapeANGULAR
NSN4820-00-360-8823
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS — — SIZE: — · — · — PN: 255770PC18 · 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
•
BODY OUTSIDE DIAMETER: 8.500 INCHES NOMINAL IN
•
STYLE DESIGNATOR: PLAIN
•
BODY INSIDE DIAMETER: 5.875 INCHES NOMINAL IN
•
MATERIAL: PLASTIC OVERALL
•
SEAT ANGLE IN DEG: 43.000 MINIMUM AND 47.000 MAXIMUM
•
SEATING SURFACE SHAPE: ANGULAR
TECHNICAL CHARACTERISTICS
OVERALL HEIGHT0.875 INCHES NOMINAL IN
BODY OUTSIDE DIAMETER8.500 INCHES NOMINAL IN
STYLE DESIGNATORPLAIN
BODY INSIDE DIAMETER5.875 INCHES NOMINAL IN
MATERIALPLASTIC OVERALL
SEAT ANGLE IN DEG43.000 MINIMUM AND 47.000 MAXIMUM
SEATING SURFACE SHAPEANGULAR
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
255584PC30Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Insurance item — stocked against contingency demandNo demilitarization required
Ready to buy 255770PC18?
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 255770PC18?
255770PC18 is a SEAT,VALVE.
What parts can replace 255770PC18?
There is 1 known substitute for 255770PC18: 255584PC30. Substitute compatibility should be verified for your specific system.
What is the NSN for 255770PC18?
255770PC18 is cataloged in the U.S. Government catalog under NSN 4820-00-360-8823. 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 — 255770PC18

✓ 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.