PartsTable
Technical Data Sheet
PartsTable / COMPONENT / HN
HN ✓ Verified by PartsTable
— · 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 VALVE,SAFETY RELIEF is a the manufacturer industrial component. Key specifications include color: AMBER LENS, material: PLASTIC ACRYLIC LENS, overall_height: 2.000 INCHES NOMINAL IN, mounting_method: PRESS FIT, overall_diameter: 4.250 INCHES NOMINAL IN, style_designator: CONVEX. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4820-00-146-6728, 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
HN
NSN: 4820-00-146-6728
FSC: 4820
CAGE: 15187 — EMERSON AUTOMATION SOLUTIONS FINAL CONTROL US LP DIV NAVY PRODUCT TEAM (USA)
SPECIFICATIONS
colorAMBER LENS
materialPLASTIC ACRYLIC LENS
overall_height2.000 INCHES NOMINAL IN
mounting_methodPRESS FIT
overall_diameter4.250 INCHES NOMINAL IN
style_designatorCONVEX
surface_conditionCONCENTRIC RINGS BACK
mounting_device_quantity1
light_transmission_designTRANSLUCENT LENS
NSN4820-00-146-6728
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS — — SIZE: — · — · — PN: HN · 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
VERIFIED SUBSTITUTES & CROSS-REFERENCES 3
276AInterchangeable
interchangeable cross-reference
interchangeable
A41261Interchangeable
interchangeable cross-reference
interchangeable
47761Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is HN?
HN is a VALVE,SAFETY RELIEF.
What parts can replace HN?
There are 3 known substitutes for HN: 276A, A41261, 47761. Substitute compatibility should be verified for your specific system.
What is the NSN for HN?
HN is cataloged in the Federal Logistics Information System (FLIS) under NSN 4820-00-146-6728. 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: July 2026