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H539 — VALVE,CHECK

✓ Government record, cited
— · GATE VALVE
PRODUCT OVERVIEW

H539: VALVE,CHECK.

The VALVE,CHECK is a the manufacturer industrial component. Key specifications include material: ALUMINUM ALLOY 2024 SEATALUMINUM ALLOY 2024 BODY, seat_angle: 37.0 DEGREES FIRST END, thread_class: 3A SECOND END3A SECOND END A, connection_type: THREADED EXTERNAL TUBE FIRST ENDTHREADED EXTERNAL TUBE FIRST END, connection_style: FLARED (TUBE) FIRST ENDFLARED (TUBE) FIRST END, style_designator: STRAIGHT THRU. This part is cataloged in the U.S.

Government catalog under NSN 4820-00-494-1332, 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
H539
NSN: 4820-00-494-1332
FSC: 4820 — Valves, Nonpowered
CAGE: 06239 — AUSCO INC (USA)
SPECIFICATIONS
materialALUMINUM ALLOY 2024 SEATALUMINUM ALLOY 2024 BODY
seat_angle37.0 DEGREES FIRST END
thread_class3A SECOND END3A SECOND END A
connection_typeTHREADED EXTERNAL TUBE FIRST ENDTHREADED EXTERNAL TUBE FIRST END
connection_styleFLARED (TUBE) FIRST ENDFLARED (TUBE) FIRST END
style_designatorSTRAIGHT THRU
thread_directionRIGHT-HAND SECOND ENDRIGHT-HAND SECOND END
mounting_positionHORIZONTALHORIZONTAL
operating_pressure4000.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS
disk_loading_methodSPRINGSPRING
flow_control_devicePOPPETPOPPET
nominal_thread_size0.562 INCHES SECOND END0.562 INCHES SECOND END IN
NSN4820-00-494-1332
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS — — SIZE: — · — · — PN: H539 · 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: POPPETPOPPET
•
CONNECTION STYLE: EXTERNAL SEAT FOR GASKET SEAL (BOSS) SECOND ENDEXTERNAL SEAT FOR GASKET SEAL (BOSS) SECOND END
•
MOUNTING POSITION: HORIZONTALHORIZONTAL
•
CONNECTION TYPE: THREADED EXTERNAL TUBE FIRST ENDTHREADED EXTERNAL TUBE FIRST END
•
STYLE DESIGNATOR: STRAIGHT THRU
•
MATERIAL DOCUMENT AND CLASSIFICATION: AMS 5643 ASSN STD SINGLE MATERIAL RESPONSE FLOW CONTROL DEVICE
TECHNICAL CHARACTERISTICS
FLOW CONTROL DEVICEPOPPETPOPPET
CONNECTION STYLEEXTERNAL SEAT FOR GASKET SEAL (BOSS) SECOND ENDEXTERNAL SEAT FOR GASKET SEAL (BOSS) SECOND END
CONNECTION STYLEFLARED (TUBE) FIRST ENDFLARED (TUBE) FIRST END
MOUNTING POSITIONHORIZONTALHORIZONTAL
CONNECTION TYPETHREADED EXTERNAL TUBE FIRST ENDTHREADED EXTERNAL TUBE FIRST END
CONNECTION TYPETHREADED EXTERNAL BOSS SECOND ENDTHREADED EXTERNAL BOSS SECOND END
STYLE DESIGNATORSTRAIGHT THRU
MATERIAL DOCUMENT AND CLASSIFICATIONAMS 5643 ASSN STD SINGLE MATERIAL RESPONSE FLOW CONTROL DEVICE
MATERIAL DOCUMENT AND CLASSIFICATIONAMS 5643 ASSN STD SINGLE MATERIAL RESPONSE FLOW CONTROL DEVICEQQ-A-225/6,ALLOY 2024 FED SPEC SINGLE MATERIAL RESPONSE SEAT
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-A-225/6,ALLOY 2024 FED SPEC SINGLE MATERIAL RESPONSE SEATQQ-A-225/6,ALLOY 2024 FED SPEC SINGLE MATERIAL RESPONSE BODY
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
991722-1Reference document
Same NSN cross-reference
Reference document — Vendor item drawing reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Terminal item — stock exhausted; no further procurementNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is H539?
H539 is a VALVE,CHECK.
What parts can replace H539?
There is 1 known substitute for H539: 991722-1. Substitute compatibility should be verified for your specific system.
What is the NSN for H539?
H539 is cataloged in the U.S. Government catalog under NSN 4820-00-494-1332. 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.