N-551 — VALVE,REGULATING,FLUID PRESSURE

✓ Government record, cited

— · GATE VALVE

PRODUCT OVERVIEW

N-551: VALVE,REGULATING,FLUID PRESSURE.

VALVE,REGULATING,FLUID PRESSURE. Key specifications include filter: NOT INCLUDED, material: NICKEL ALLOY AND COPPER ALLOY SEAT, nut_style: SLEEVE, body_style: STRAIGHT THRU, nut_length: 0.250 INCHES NOMINAL IN, temp_rating: 165.0 FAHRENHEIT MAXIMUM DEGF. This part is cataloged in the U.S.

Government catalog under NSN 4820-00-181-8911, 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

NSN: 4820-00-181-8911
NIINs: 001818911, 004297505, 011655892, 014530039, 014590506, 014626077
FSC: 4820 — Valves, Nonpowered
CAGE: 35795 — LESLIE CONTROLS, INC. DBA LESLIE CONTROLS INC (USA)

SPECIFICATIONS

filter	NOT INCLUDED
material	NICKEL ALLOY AND COPPER ALLOY SEAT
nut_style	SLEEVE
body_style	STRAIGHT THRU
nut_length	0.250 INCHES NOMINAL IN
temp_rating	165.0 FAHRENHEIT MAXIMUM DEGF
thread_class	2B
boss_diameter	2.375 INCHES NOMINAL OVERALL IN
thread_series	UNF
boss_thickness	0.125 INCHES NOMINAL OVERALL IN
furnished_items	TAILPIECE AND UNION NUT
inside_diameter	1.187 INCHES NOMINAL IN
NSN	4820-00-181-8911

COMPONENT DIAGRAM

KEY FEATURES

•

FLOW CONTROL DEVICE: DIAPHRAGM

•

VALVE STEM DESIGN: SINGLE SEAT

•

RENEWABLE SEAT RING TYPE: THREADED

•

SECOND END RELATIONSHIP WITH FIRST END: IDENTICAL

•

BODY STYLE: STRAIGHT THRU

•

REGULATION TYPE: AUTOMATIC DOUBLE STAGE

•

FIRST END STYLE DESIGNATOR: SOCKET W/BRAZING RING

•

SPECIAL TEST FEATURES: HIGH-IMPACT SHOCK TESTS ARE REQUIRED AS DIRECTED IN PARAGRAPHS 3.6 AND 4.4.2.3 OF MIL-V-2042 IN PAC TEST ABOVE IN

TECHNICAL CHARACTERISTICS

FLOW CONTROL DEVICE	DIAPHRAGM
VALVE STEM DESIGN	SINGLE SEAT
RENEWABLE SEAT RING TYPE	THREADED
SECOND END RELATIONSHIP WITH FIRST END	IDENTICAL
BODY STYLE	STRAIGHT THRU
REGULATION TYPE	AUTOMATIC DOUBLE STAGE
FIRST END STYLE DESIGNATOR	SOCKET W/BRAZING RING
SPECIAL TEST FEATURES	HIGH-IMPACT SHOCK TESTS ARE REQUIRED AS DIRECTED IN PARAGRAPHS 3.6 AND 4.4.2.3 OF MIL-V-2042 IN PAC TEST ABOVE IN
TEMP RATING	165.0 FAHRENHEIT MAXIMUM DEGF
END CONNECTION QUANTITY	2

SUBSTITUTES & CROSS-REFERENCES 7

E420ALT6Reference document

Same NSN cross-reference

Reference document — Secondary reference

40399-906Reference document

Same NSN cross-reference

Reference document — Advisory reference — outside the item-of-supply concept

40399-01 1IN 25Reference document

Same NSN cross-reference

Reference document — Advisory reference — outside the item-of-supply concept

30806262REVFReference document

Same NSN cross-reference

Reference document — Secondary reference

4820PL1341074Reference document

Same NSN cross-reference

Reference document — Informative reference only

MILV2042Reference 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

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FREQUENTLY ASKED QUESTIONS

What is N-551?

N-551 is a VALVE,REGULATING,FLUID PRESSURE.

What parts can replace N-551?

There are 7 known substitutes for N-551: E420ALT6, 40399-906, 40399-01 1IN 25 and 4 more. Substitute compatibility should be verified for your specific system.

What is the NSN for N-551?

N-551 is cataloged in the U.S. Government catalog under NSN 4820-00-181-8911. This indicates validated use in U.S. government and defense supply chains.

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N-551 — VALVE,REGULATING,FLUID PRESSURE

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