PartsTable
Technical Data Sheet
103903-1 ✓ 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

VALVE,REGULATING,FLUID PRESSURE. Key specifications include filter: NOT INCLUDED, body_style: TEE, temp_rating: -65.0 FAHRENHEIT MINIMUM AND 400.0 FAHRENHEIT MAXIMUM DEGF, regulation_type: AUTOMATIC DOUBLE STAGE, valve_stem_design: DOUBLE SEAT, flow_control_device: POPPET. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4820-00-146-1952, 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
103903-1
NSN: 4820-00-146-1952
FSC: 4820
CAGE: 55820 — RTX CORPORATION DIV PRATT & WHITNEY (USA)
SPECIFICATIONS
filterNOT INCLUDED
body_styleTEE
temp_rating-65.0 FAHRENHEIT MINIMUM AND 400.0 FAHRENHEIT MAXIMUM DEGF
regulation_typeAUTOMATIC DOUBLE STAGE
valve_stem_designDOUBLE SEAT
flow_control_devicePOPPET
valve_loading_methodSPRING
first_end_thread_class3A A
third_end_thread_class2B
end_connection_quantity3
second_end_thread_class3A A
first_end_style_designatorFLARED
NSN4820-00-146-1952
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS SIZE: — · — · — PN: 103903-1 · 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
SECOND END SEAT ANGLE IN DEG: 12.0
FIRST END SEAT ANGLE IN DEG: 37.0
THIRD END STYLE DESIGNATOR: GASKET SEAL
SECOND END OUTSIDE DIAMETER TUBE ACCOMMODATED: 0.125 INCHES NOMINAL IN
TEMP RATING: -65.0 FAHRENHEIT MINIMUM AND 400.0 FAHRENHEIT MAXIMUM DEGF
THIRD END THREAD DIRECTION: RIGHT-HAND
THREAD SIZE AND SERIES/TYPE DESIGNATOR: 5/16-24 UNIFIED NATIONAL JOINT FINE (UNJF) MODIFIED SECOND END
FIRST END OUTSIDE DIAMETER TUBE ACCOMMODATED: 0.250 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
SECOND END SEAT ANGLE IN DEG12.0
FIRST END SEAT ANGLE IN DEG37.0
THIRD END STYLE DESIGNATORGASKET SEAL
SECOND END OUTSIDE DIAMETER TUBE ACCOMMODATED0.125 INCHES NOMINAL IN
TEMP RATING-65.0 FAHRENHEIT MINIMUM AND 400.0 FAHRENHEIT MAXIMUM DEGF
THIRD END THREAD DIRECTIONRIGHT-HAND
THREAD SIZE AND SERIES/TYPE DESIGNATOR5/16-24 UNIFIED NATIONAL JOINT FINE (UNJF) MODIFIED SECOND END
FIRST END OUTSIDE DIAMETER TUBE ACCOMMODATED0.250 INCHES NOMINAL IN
FILTERNOT INCLUDED
END CONNECTION QUANTITY3
VERIFIED SUBSTITUTES & CROSS-REFERENCES 10
2-658Interchangeable
interchangeable cross-reference
interchangeable
5130PL0944648Interchangeable
interchangeable cross-reference
interchangeable
GGG-B-001013Interchangeable
interchangeable cross-reference
interchangeable
EX265-8Interchangeable
interchangeable cross-reference
interchangeable
3002Interchangeable
interchangeable cross-reference
interchangeable
5190438Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 103903-1?
103903-1 is a VALVE,REGULATING,FLUID PRESSURE.
What parts can replace 103903-1?
There are 10 known substitutes for 103903-1: 2-658, 5130PL0944648, GGG-B-001013 and 7 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 103903-1?
103903-1 is cataloged in the Federal Logistics Information System (FLIS) under NSN 4820-00-146-1952. This indicates validated use in U.S. government and defense supply chains.
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