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665-6-6SS1 — VALVE,SAFETY RELIEF

✓ Government record, cited
— · GATE VALVE
PRODUCT OVERVIEW

665-6-6SS1: VALVE,SAFETY RELIEF.

The VALVE,SAFETY RELIEF is a the manufacturer industrial component. Key specifications include material: STEEL COMP 416 FLOW CONTROL DEVICE, connection_type: THREADED INTERNAL TUBE ALL ENDS, style_designator: STRAIGHT THRU NOTE: TO BE USED FOR VALVE BODIES OF ONE SECTION ONLY., disk_loading_method: SPRING, flow_control_device: POPPET, minimum_operating_temp: -40.0 FAHRENHEIT DEGF. This part is cataloged in the U.S.

Government catalog under NSN 4820-01-486-5173, 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
665-6-6SS1
NSN: 4820-01-486-5173
FSC: 4820 — Valves, Nonpowered
CAGE: 09990 — PARKER-HANNIFIN CORPORATION DBA PNEUTRONICS DIV HYDRAULIC VALVE DIVISION (USA)
SPECIFICATIONS
materialSTEEL COMP 416 FLOW CONTROL DEVICE
connection_typeTHREADED INTERNAL TUBE ALL ENDS
style_designatorSTRAIGHT THRU NOTE: TO BE USED FOR VALVE BODIES OF ONE SECTION ONLY.
disk_loading_methodSPRING
flow_control_devicePOPPET
minimum_operating_temp-40.0 FAHRENHEIT DEGF
valve_operation_methodAUTOMATIC
end_item_identificationGENERATOR SET AG9140 RS; W/S DESIGNATOR ARLEIGH BURKE CLASS DDG
media_for_which_designedETHYLENE GLYCOL SINGLE RESPONSE
opening_pressure_setting550.0 POUNDS PER SQUARE INCH LBS
renewable_seat_ring_typePRESSED-IN
adjustable_pressure_range+430.0 TO 650.0 POUNDS PER SQUARE INCH LBS
NSN4820-01-486-5173
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS — — SIZE: — · — · — PN: 665-6-6SS1 · 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
•
RENEWABLE SEAT RING TYPE: PRESSED-IN
•
MINIMUM OPERATING TEMP: -40.0 FAHRENHEIT DEGF
•
CONNECTION TYPE: THREADED INTERNAL TUBE ALL ENDS
•
STYLE DESIGNATOR: STRAIGHT THRU NOTE: TO BE USED FOR VALVE BODIES OF ONE SECTION ONLY.
•
NOMINAL OUTSIDE DIAMETER TUBE ACCOMMODATED: 0.250 INCHES ALL ENDS IN
•
ADJUSTABLE PRESSURE RANGE: +430.0 TO 650.0 POUNDS PER SQUARE INCH LBS
•
DISK LOADING METHOD: SPRING
TECHNICAL CHARACTERISTICS
FLOW CONTROL DEVICEPOPPET
RENEWABLE SEAT RING TYPEPRESSED-IN
MINIMUM OPERATING TEMP-40.0 FAHRENHEIT DEGF
CONNECTION TYPETHREADED INTERNAL TUBE ALL ENDS
STYLE DESIGNATORSTRAIGHT THRU NOTE: TO BE USED FOR VALVE BODIES OF ONE SECTION ONLY.
NOMINAL OUTSIDE DIAMETER TUBE ACCOMMODATED0.250 INCHES ALL ENDS IN
ADJUSTABLE PRESSURE RANGE+430.0 TO 650.0 POUNDS PER SQUARE INCH LBS
DISK LOADING METHODSPRING
SPECIAL FEATURESEND CONNECTIONS ARE IDENTICAL; INTERNAL STRAIT THREADS; GASKET SEAL. O-RING BUNA N IAW MIL-P-5315(B) SUPERSEDED BY QPL-5315-23 FOR USE WITH JP-3, JP-4, JP-5 FUEL. NEXT HIGHER ASSEMBLY FUEL SYSTEM, P/N 23059421.
MEDIA FOR WHICH DESIGNEDETHYLENE GLYCOL SINGLE RESPONSE
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 2
23059486-6Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
23059421 ITEM 80Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
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 665-6-6SS1?
665-6-6SS1 is a VALVE,SAFETY RELIEF.
What parts can replace 665-6-6SS1?
There are 2 known substitutes for 665-6-6SS1: 23059486-6, 23059421 ITEM 80. Substitute compatibility should be verified for your specific system.
What is the NSN for 665-6-6SS1?
665-6-6SS1 is cataloged in the U.S. Government catalog under NSN 4820-01-486-5173. 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.