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HL4056PC128 — SEAT,VALVE

✓ Government record, cited
— · GATE VALVE
PRODUCT OVERVIEW

HL4056PC128: SEAT,VALVE.

The SEAT,VALVE is a the manufacturer industrial component. Key specifications include material: ALUMINUM ALLOY OVERALL, flange_diameter: 3.938 INCHES NOMINAL IN, style_designator: PLAIN FLANGED, under_flange_height: 0.406 INCHES NOMINAL IN, body_outside_diameter: 3.094 INCHES NOMINAL IN, seating_surface_shape: FLAT. This part is cataloged in the U.S.

Government catalog under NSN 4820-00-148-5553, 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
HL4056PC128
NSN: 4820-00-148-5553
FSC: 4820 — Valves, Nonpowered
CAGE: 93236 — DRESSER-RAND CO WORTHINGTON COMPRESSOR OPN A JOINT VENTURE (USA)
SPECIFICATIONS
materialALUMINUM ALLOY OVERALL
flange_diameter3.938 INCHES NOMINAL IN
style_designatorPLAIN FLANGED
under_flange_height0.406 INCHES NOMINAL IN
body_outside_diameter3.094 INCHES NOMINAL IN
seating_surface_shapeFLAT
flange_seat_to_disk_end_height0.125 INCHES NOMINAL IN
NSN4820-00-148-5553
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS — — SIZE: — · — · — PN: HL4056PC128 · 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
•
FLANGE SEAT TO DISK END HEIGHT: 0.125 INCHES NOMINAL IN
•
FLANGE DIAMETER: 3.938 INCHES NOMINAL IN
•
BODY OUTSIDE DIAMETER: 3.094 INCHES NOMINAL IN
•
STYLE DESIGNATOR: PLAIN FLANGED
•
UNDER FLANGE HEIGHT: 0.406 INCHES NOMINAL IN
•
MATERIAL: ALUMINUM ALLOY OVERALL
•
SEATING SURFACE SHAPE: FLAT
TECHNICAL CHARACTERISTICS
FLANGE SEAT TO DISK END HEIGHT0.125 INCHES NOMINAL IN
FLANGE DIAMETER3.938 INCHES NOMINAL IN
BODY OUTSIDE DIAMETER3.094 INCHES NOMINAL IN
STYLE DESIGNATORPLAIN FLANGED
UNDER FLANGE HEIGHT0.406 INCHES NOMINAL IN
MATERIALALUMINUM ALLOY OVERALL
SEATING SURFACE SHAPEFLAT
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 9
HL6022PC118Reference document
Same NSN cross-reference
Reference document — Secondary reference
HL4043PC128Reference document
Same NSN cross-reference
Reference document — Secondary reference
HL6017PC118Reference document
Same NSN cross-reference
Reference document — Secondary reference
HL4042PC128Reference document
Same NSN cross-reference
Reference document — Secondary reference
3107NReference document
Same NSN cross-reference
Reference document — Design control — primary reference
HL4057PC128Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
Demilitarization required — mutilation
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FREQUENTLY ASKED QUESTIONS
What is HL4056PC128?
HL4056PC128 is a SEAT,VALVE.
What parts can replace HL4056PC128?
There are 9 known substitutes for HL4056PC128: HL6022PC118, HL4043PC128, HL6017PC118 and 6 more. Substitute compatibility should be verified for your specific system.
What is the NSN for HL4056PC128?
HL4056PC128 is cataloged in the U.S. Government catalog under NSN 4820-00-148-5553. 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.