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128SCEC603-1 — VALVE,CHECK

✓ Government record, cited
— · GATE VALVE
PRODUCT OVERVIEW

128SCEC603-1: VALVE,CHECK.

The VALVE,CHECK is a the manufacturer industrial component. Key specifications include material: ALUMINUM SEAT, special_features: FLIGHT SAFETY CRITICAL, style_designator: STRAIGHT THRU, disk_loading_method: SPRING, flow_control_device: POPPET, maximum_operating_temp: 250.0 FAHRENHEIT SINGLE RESPONSE DEGF. This part is cataloged in the U.S.

Government catalog under NSN 4820-00-006-9929, 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
128SCEC603-1
NSN: 4820-00-006-9929
FSC: 4820 — Valves, Nonpowered
CAGE: 26512 — NORTHROP GRUMMAN SYSTEMS CORPORATION (USA)
SPECIFICATIONS
materialALUMINUM SEAT
special_featuresFLIGHT SAFETY CRITICAL
style_designatorSTRAIGHT THRU
disk_loading_methodSPRING
flow_control_devicePOPPET
maximum_operating_temp250.0 FAHRENHEIT SINGLE RESPONSE DEGF
valve_operation_methodAUTOMATIC
media_for_which_designedAIR SINGLE RESPONSE
criticality_code_justificationFEAT
NSN4820-00-006-9929
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS — — SIZE: — · — · — PN: 128SCEC603-1 · 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: POPPET
•
CRITICALITY CODE JUSTIFICATION: FEAT
•
STYLE DESIGNATOR: STRAIGHT THRU
•
MAXIMUM OPERATING TEMP: 250.0 FAHRENHEIT SINGLE RESPONSE DEGF
•
DISK LOADING METHOD: SPRING
•
MEDIA FOR WHICH DESIGNED: AIR SINGLE RESPONSE
•
MATERIAL: ALUMINUM SEAT
TECHNICAL CHARACTERISTICS
FLOW CONTROL DEVICEPOPPET
CRITICALITY CODE JUSTIFICATIONFEAT
STYLE DESIGNATORSTRAIGHT THRU
MAXIMUM OPERATING TEMP250.0 FAHRENHEIT SINGLE RESPONSE DEGF
DISK LOADING METHODSPRING
SPECIAL FEATURESFLIGHT SAFETY CRITICAL
MEDIA FOR WHICH DESIGNEDAIR SINGLE RESPONSE
MATERIALALUMINUM SEAT
MATERIALALUMINUM BODY
VALVE OPERATION METHODAUTOMATIC
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
CYLB50098Reference 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 128SCEC603-1?
128SCEC603-1 is a VALVE,CHECK.
What parts can replace 128SCEC603-1?
There is 1 known substitute for 128SCEC603-1: CYLB50098. Substitute compatibility should be verified for your specific system.
What is the NSN for 128SCEC603-1?
128SCEC603-1 is cataloged in the U.S. Government catalog under NSN 4820-00-006-9929. 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.