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Technical Data Sheet
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991-011 — VALVE,CHECK

✓ Government record, cited
— · GATE VALVE
PRODUCT OVERVIEW

991-011: VALVE,CHECK.

The VALVE,CHECK is a the manufacturer industrial component. Key specifications include end_item_identification: HYDRAULIC POWER UNIT, 4330-01-561-7930. This part is cataloged in the U.S.

Government catalog under NSN 4820-00-902-3856, 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
991-011
NSN: 4820-00-902-3856
NIINs: 009023856, 014625413, 016011674
FSC: 4820 — Valves, Nonpowered
CAGE: 81833 — AEROCONTROLEX GROUP, INC. (USA)
SPECIFICATIONS
special_featuresSERVICE KIT USED TO COVERT L OR K ADJUSTMENT TO AN ALUMINUM HANDKNOB ADJUSTMENT; KIT CONTAINS 1 LOCKNUT, 1 KNOB ADJUSTER, 1 INFORMATION SHEET AND 1 SCREW
end_item_identificationHYDRAULIC POWER UNIT, 4330-01-561-7930
NSN4820-00-902-3856
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS — — SIZE: — · — · — PN: 991-011 · 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: DISK
•
CONNECTION STYLE: PLAIN (TUBE) FIRST END
•
MOUNTING POSITION: HORIZONTAL OR VERTICAL
•
CONNECTION TYPE: THREADED EXTERNAL TUBE FIRST END
•
STYLE DESIGNATOR: STRAIGHT THRU
•
OPERATING PRESSURE: 127.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS
•
THREAD DIRECTION: RIGHT-HAND FIRST END
•
NOMINAL THREAD SIZE: 2.000 INCHES FIRST END IN
TECHNICAL CHARACTERISTICS
FLOW CONTROL DEVICEDISK
CONNECTION STYLEPLAIN (TUBE) FIRST END
MOUNTING POSITIONHORIZONTAL OR VERTICAL
CONNECTION TYPETHREADED EXTERNAL TUBE FIRST END
STYLE DESIGNATORSTRAIGHT THRU
OPERATING PRESSURE127.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS
THREAD DIRECTIONRIGHT-HAND FIRST END
NOMINAL THREAD SIZE2.000 INCHES FIRST END IN
MAXIMUM OPERATING TEMP625.0 FAHRENHEIT SINGLE RESPONSE DEGF
DISK LOADING METHODSPRING
SUBSTITUTES & CROSS-REFERENCES 1
HE284-5002-0001Reference 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 991-011?
991-011 is a VALVE,CHECK.
What parts can replace 991-011?
There is 1 known substitute for 991-011: HE284-5002-0001. Substitute compatibility should be verified for your specific system.
What is the NSN for 991-011?
991-011 is cataloged in the U.S. Government catalog under NSN 4820-00-902-3856. 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.