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28891-1 — TRANSFORMER,AUDIO FREQUENCY

✓ Government record, cited
— · GATE VALVE
PRODUCT OVERVIEW

28891-1: TRANSFORMER,AUDIO FREQUENCY.

The TRANSFORMER,AUDIO FREQUENCY is a the manufacturer industrial component. Key specifications include material: NICKEL ALLOY BODY, seat_angle: 37.0 DEGREES ALL ENDS, thread_class: 3A ALL ENDS A, connection_type: THREADED EXTERNAL TUBE ALL ENDS, connection_style: FLARED (TUBE) ALL ENDS, style_designator: ANGLE. This part is cataloged in the U.S.

Government catalog under NSN 4820-00-885-1619, 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
28891-1
NSN: 4820-00-885-1619
FSC: 4820 — Valves, Nonpowered
CAGE: 66195 — SOLAR TURBINES INCORPORATED DBA SOLAR TURBINES INCORPORATED (USA)
SPECIFICATIONS
materialNICKEL ALLOY BODY
seat_angle37.0 DEGREES ALL ENDS
thread_class3A ALL ENDS A
connection_typeTHREADED EXTERNAL TUBE ALL ENDS
connection_styleFLARED (TUBE) ALL ENDS
style_designatorANGLE
thread_directionRIGHT-HAND ALL ENDS
mounting_positionHORIZONTAL
flow_control_deviceBALL
nominal_thread_size0.562 INCHES ALL ENDS IN
valve_operation_methodAUTOMATIC
thread_series_designatorUNF ALL ENDS
NSN4820-00-885-1619
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS — — SIZE: — · — · — PN: 28891-1 · 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
•
FLOW CONTROL DEVICE: BALL
•
CONNECTION STYLE: FLARED (TUBE) ALL ENDS
•
MOUNTING POSITION: HORIZONTAL
•
CONNECTION TYPE: THREADED EXTERNAL TUBE ALL ENDS
•
STYLE DESIGNATOR: ANGLE
•
THREAD DIRECTION: RIGHT-HAND ALL ENDS
•
NOMINAL THREAD SIZE: 0.562 INCHES ALL ENDS IN
•
SEAT ANGLE: 37.0 DEGREES ALL ENDS
TECHNICAL CHARACTERISTICS
FLOW CONTROL DEVICEBALL
CONNECTION STYLEFLARED (TUBE) ALL ENDS
MOUNTING POSITIONHORIZONTAL
CONNECTION TYPETHREADED EXTERNAL TUBE ALL ENDS
STYLE DESIGNATORANGLE
THREAD DIRECTIONRIGHT-HAND ALL ENDS
NOMINAL THREAD SIZE0.562 INCHES ALL ENDS IN
SEAT ANGLE37.0 DEGREES ALL ENDS
THREAD CLASS3A ALL ENDS A
MATERIALNICKEL ALLOY BODY
SUBSTITUTES & CROSS-REFERENCES 1
28891Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 28891-1?
28891-1 is a TRANSFORMER,AUDIO FREQUENCY.
What parts can replace 28891-1?
There is 1 known substitute for 28891-1: 28891. Substitute compatibility should be verified for your specific system.
What is the NSN for 28891-1?
28891-1 is cataloged in the U.S. Government catalog under NSN 4820-00-885-1619. This indicates validated use in U.S. government and defense supply chains.
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✓ PartsTable — the parts reference. Every fact cited to its source.
PartsTable Design LLC · partstable.com
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.
PartsTable commercial catalog: edition Unified commercial catalog snapshot through 2026-09-28, edition date not on file, retrieved 2026-09-28.