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255551 ASSY A — 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 VALVE,BALL is a the manufacturer industrial component. Key specifications include material: PLASTIC POLYAMIDE NYLON SEAT, connection_type: BUTT WELD PIPE ALL ENDS, connection_style: BEVELED (PIPE) ALL ENDS, style_designator: STRAIGHT THRU, operating_pressure: 4500.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS, valve_operation_method: MANUAL. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System under NSN 4820-01-265-0415, 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
255551 ASSY A
NSN: 4820-01-265-0415
FSC: 4820
CAGE: 43689 — HUNTINGTON INGALLS INC DIV NEWPORT NEWS SHIPBUILDING (USA)
SPECIFICATIONS
materialPLASTIC POLYAMIDE NYLON SEAT
connection_typeBUTT WELD PIPE ALL ENDS
connection_styleBEVELED (PIPE) ALL ENDS
style_designatorSTRAIGHT THRU
operating_pressure4500.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS
valve_operation_methodMANUAL
media_for_which_designedWATER, FRESH SINGLE RESPONSE
criticality_code_justificationZZZY
nominal_pipe_size_accommodated2.000 INCHES ALL ENDS IN
reference_number_differentiating_characteristicsQUALITY CONTROL IAW NAVSHIPS 0948-045-7010 MATERIAL IDENTIFICATION AND CONTROL INSTRUCTION FOR LEVEL 1 ITEMS
NSN4820-01-265-0415
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS — — SIZE: — · — · — PN: 255551 ASSY A · 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
•
REFERENCE NUMBER DIFFERENTIATING CHARACTERISTICS: QUALITY CONTROL IAW NAVSHIPS 0948-045-7010 MATERIAL IDENTIFICATION AND CONTROL INSTRUCTION FOR LEVEL 1 ITEMS
•
NOMINAL PIPE SIZE ACCOMMODATED: 2.000 INCHES ALL ENDS IN
•
CONNECTION TYPE: BUTT WELD PIPE ALL ENDS
•
MATERIAL: PLASTIC POLYAMIDE NYLON SEAT
•
OPERATING PRESSURE: 4500.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS
•
VALVE OPERATION METHOD: MANUAL
•
STYLE DESIGNATOR: STRAIGHT THRU
•
CRITICALITY CODE JUSTIFICATION: ZZZY
TECHNICAL CHARACTERISTICS
REFERENCE NUMBER DIFFERENTIATING CHARACTERISTICSQUALITY CONTROL IAW NAVSHIPS 0948-045-7010 MATERIAL IDENTIFICATION AND CONTROL INSTRUCTION FOR LEVEL 1 ITEMS
NOMINAL PIPE SIZE ACCOMMODATED2.000 INCHES ALL ENDS IN
CONNECTION TYPEBUTT WELD PIPE ALL ENDS
MATERIALPLASTIC POLYAMIDE NYLON SEAT
OPERATING PRESSURE4500.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS
VALVE OPERATION METHODMANUAL
STYLE DESIGNATORSTRAIGHT THRU
CRITICALITY CODE JUSTIFICATIONZZZY
MEDIA FOR WHICH DESIGNEDWATER, FRESH SINGLE RESPONSE
CONNECTION STYLEBEVELED (PIPE) ALL ENDS
VERIFIED SUBSTITUTES & CROSS-REFERENCES 7
145636InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
5-32BALLGRADE3InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
NDC43598-0811-12InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
NDC00904-6717-60InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
96-0186InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
255551InterchangeableGOVERNMENT REGISTRY
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusACTIVEGOVERNMENT REGISTRY
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 255551 ASSY A?
255551 ASSY A is a VALVE,BALL.
What parts can replace 255551 ASSY A?
There are 7 known substitutes for 255551 ASSY A: 145636, 5-32BALLGRADE3, NDC43598-0811-12 and 4 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 255551 ASSY A?
255551 ASSY A is cataloged in the Federal Logistics Information System under NSN 4820-01-265-0415. 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.
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Last verified: September 2026