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644646-103 — VALVE,VENT

✓ Government record, cited
— · GATE VALVE
PRODUCT OVERVIEW

644646-103: VALVE,VENT.

The VALVE,VENT is a the manufacturer industrial component. Key specifications include material: MAGNESIUM BODY, seat_angle: 37.0 DEGREES FIRST END, thread_class: 3B SECOND END, connection_type: THREADED INTERNAL TUBE FIRST END, connection_style: INVERTED FLARE(TUBE) SECOND END, style_designator: STRAIGHT THRU NOTE: TO BE USED FOR VALVE BODIES OF ONE SECTION ONLY.. This part is cataloged in the U.S.

Government catalog under NSN 4820-01-087-3711, 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
644646-103
NSN: 4820-01-087-3711
FSC: 4820 — Valves, Nonpowered
CAGE: 98897 — LOCKHEED MARTIN CORP (USA)
SPECIFICATIONS
materialMAGNESIUM BODY
seat_angle37.0 DEGREES FIRST END
thread_class3B SECOND END
connection_typeTHREADED INTERNAL TUBE FIRST END
connection_styleINVERTED FLARE(TUBE) SECOND END
style_designatorSTRAIGHT THRU NOTE: TO BE USED FOR VALVE BODIES OF ONE SECTION ONLY.
thread_directionRIGHT-HAND SECOND END
nominal_thread_size0.437 INCHES SECOND END IN
media_for_which_designedAIR SINGLE RESPONSE
thread_series_designatorUNF SECOND END
nominal_outside_diameter_tube_accommodated0.250 INCHES SECOND END IN
NSN4820-01-087-3711
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS — — SIZE: — · — · — PN: 644646-103 · 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
•
CONNECTION STYLE: INVERTED FLARE(TUBE) FIRST END
•
CONNECTION TYPE: THREADED INTERNAL TUBE SECOND END
•
STYLE DESIGNATOR: STRAIGHT THRU NOTE: TO BE USED FOR VALVE BODIES OF ONE SECTION ONLY.
•
NOMINAL OUTSIDE DIAMETER TUBE ACCOMMODATED: 0.250 INCHES SECOND END IN
•
THREAD DIRECTION: RIGHT-HAND SECOND END
•
NOMINAL THREAD SIZE: 0.437 INCHES SECOND END IN
TECHNICAL CHARACTERISTICS
CONNECTION STYLEINVERTED FLARE(TUBE) FIRST END
CONNECTION STYLEINVERTED FLARE(TUBE) SECOND END
CONNECTION TYPETHREADED INTERNAL TUBE SECOND END
CONNECTION TYPETHREADED INTERNAL TUBE FIRST END
STYLE DESIGNATORSTRAIGHT THRU NOTE: TO BE USED FOR VALVE BODIES OF ONE SECTION ONLY.
NOMINAL OUTSIDE DIAMETER TUBE ACCOMMODATED0.250 INCHES SECOND END IN
THREAD DIRECTIONRIGHT-HAND SECOND END
NOMINAL THREAD SIZE0.437 INCHES SECOND END IN
SEAT ANGLE37.0 DEGREES FIRST END
SEAT ANGLE37.0 DEGREES SECOND END
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 1
103140-7-1Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 644646-103?
644646-103 is a VALVE,VENT.
What parts can replace 644646-103?
There is 1 known substitute for 644646-103: 103140-7-1. Substitute compatibility should be verified for your specific system.
What is the NSN for 644646-103?
644646-103 is cataloged in the U.S. Government catalog under NSN 4820-01-087-3711. This indicates validated use in U.S. government and defense supply chains.
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