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639XB2-4-2 — 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,SAFETY RELIEF is a the manufacturer industrial component. Key specifications include material: RUBBER SYNTHETIC SEAT, seat_angle: 37.0 DEGREES ALL ENDS, bonnet_type: INSIDE SPRING, thread_class: 3A ALL ENDS A, connection_type: THREADED EXTERNAL TUBE ALL ENDS, connection_style: FLARED (TUBE) ALL ENDS. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System under NSN 4820-01-011-6156, 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
639XB2-4-2
NSN: 4820-01-011-6156
FSC: 4820
CAGE: 86768 — TELEDYNE INDUSTRIES INC TELEDYNE FLUID SYSTEMS REPUBLIC BUSINESS UNIT (USA)
SPECIFICATIONS
materialRUBBER SYNTHETIC SEAT
seat_angle37.0 DEGREES ALL ENDS
bonnet_typeINSIDE SPRING
thread_class3A ALL ENDS A
connection_typeTHREADED EXTERNAL TUBE ALL ENDS
connection_styleFLARED (TUBE) ALL ENDS
style_designatorANGLE
thread_directionRIGHT-HAND ALL ENDS
operating_pressure50.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS
disk_loading_methodSPRING
flow_control_devicePOPPET
nominal_thread_size0.438 INCHES ALL ENDS IN
NSN4820-01-011-6156
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS — — SIZE: — · — · — PN: 639XB2-4-2 · 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
•
THREAD CLASS: 3A ALL ENDS A
•
BONNET TYPE: INSIDE SPRING
•
FLOW CONTROL DEVICE: POPPET
•
DISK LOADING METHOD: SPRING
•
ADJUSTABLE PRESSURE RANGE: +10.0 TO 50.0 POUNDS PER SQUARE INCH LBS
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-B-626,ALLOY 360 FED SPEC SINGLE MATERIAL RESPONSE BODY
•
CONNECTION STYLE: FLARED (TUBE) ALL ENDS
•
VALVE OPERATION METHOD: AUTOMATIC
TECHNICAL CHARACTERISTICS
THREAD CLASS3A ALL ENDS A
BONNET TYPEINSIDE SPRING
FLOW CONTROL DEVICEPOPPET
DISK LOADING METHODSPRING
ADJUSTABLE PRESSURE RANGE+10.0 TO 50.0 POUNDS PER SQUARE INCH LBS
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-B-626,ALLOY 360 FED SPEC SINGLE MATERIAL RESPONSE BODY
CONNECTION STYLEFLARED (TUBE) ALL ENDS
VALVE OPERATION METHODAUTOMATIC
MATERIALRUBBER SYNTHETIC SEAT
MEDIA FOR WHICH DESIGNEDAIR FIRST RESPONSE
VERIFIED SUBSTITUTES & CROSS-REFERENCES 15
21776InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
50-11170InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
1683-014-7InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
6507InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
BZ-R31InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
127619114InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVEGOVERNMENT REGISTRY
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 639XB2-4-2?
639XB2-4-2 is a VALVE,SAFETY RELIEF.
What parts can replace 639XB2-4-2?
There are 15 known substitutes for 639XB2-4-2: 21776, 50-11170, 1683-014-7 and 12 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 639XB2-4-2?
639XB2-4-2 is cataloged in the Federal Logistics Information System under NSN 4820-01-011-6156. 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: October 2026