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N-551 PIECE 3 — Technical Data Sheet

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— · GATE VALVE
WHAT YOU NEED TO KNOW
Full open or full close only — never throttle Rising stem shows position visually
Throttling a gate valve erodes seats
PRODUCT OVERVIEW

The RETAINER,DISK,VALVE is a the manufacturer industrial component. Key specifications include inside_diameter: 1.187 INCHES NOMINAL IN, outside_diameter: 1.625 INCHES NOMINAL IN, special_features: DISC HOLDER;PRESSURE REDUCING VALVE; MATERIAL IS NICKEL COPPER ALLOY; PLAIN STYLE. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System under NSN 4820-01-459-0506, 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
N-551 PIECE 3
NSN: 4820-01-459-0506
FSC: 4820
CAGE: 35795 — LESLIE CONTROLS, INC. DBA LESLIE CONTROLS INC (USA)
SPECIFICATIONS
inside_diameter1.187 INCHES NOMINAL IN
outside_diameter1.625 INCHES NOMINAL IN
special_featuresDISC HOLDER;PRESSURE REDUCING VALVE; MATERIAL IS NICKEL COPPER ALLOY; PLAIN STYLE
NSN4820-01-459-0506
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS — — SIZE: — · — · — PN: N-551 PIECE 3 · 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
•
INSIDE DIAMETER: 1.187 INCHES NOMINAL IN
•
OUTSIDE DIAMETER: 1.625 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
INSIDE DIAMETER1.187 INCHES NOMINAL IN
SPECIAL FEATURESDISC HOLDER;PRESSURE REDUCING VALVE; MATERIAL IS NICKEL COPPER ALLOY; PLAIN STYLE
OUTSIDE DIAMETER1.625 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 8
E420ALT6InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
40399-906InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
40399-01 1IN 25InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
N551InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
30 1IN25T60PSI N551XN667InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
YB2310E292 - CD N667InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVEGOVERNMENT REGISTRY
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is N-551 PIECE 3?
N-551 PIECE 3 is a RETAINER,DISK,VALVE.
What parts can replace N-551 PIECE 3?
There are 8 known substitutes for N-551 PIECE 3: E420ALT6, 40399-906, 40399-01 1IN 25 and 5 more. Substitute compatibility should be verified for your specific system.
What is the NSN for N-551 PIECE 3?
N-551 PIECE 3 is cataloged in the Federal Logistics Information System under NSN 4820-01-459-0506. This indicates validated use in U.S. government and defense supply chains.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: October 2026