PartsTable
Technical Data Sheet

81PS1F68-8/1320 — VALVE,SAFETY RELIEF

✓ Government record, cited
— · GATE VALVE
PRODUCT OVERVIEW

81PS1F68-8/1320: VALVE,SAFETY RELIEF.

The VALVE,SAFETY RELIEF is a the manufacturer industrial component. Key specifications include material: PLASTIC POLYPROPYLENE SEAT, bonnet_type: INSIDE SPRING, style_designator: ANGLE W/OFFSET, operating_pressure: 6.3 KILOGRAMS PER SQUARE CENTIMETER NOMINAL POWER DRIVE KG, valve_operation_method: AIR, bonnet_attachment_method: THREADED. This part is cataloged in the U.S.

Government catalog under NSN 4820-01-646-3618, 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
81PS1F68-8/1320
NSN: 4820-01-646-3618
FSC: 4820 — Valves, Nonpowered
CAGE: 15187 — EMERSON AUTOMATION SOLUTIONS FINAL CONTROL US LP DIV NAVY PRODUCT TEAM (USA)
SPECIFICATIONS
materialPLASTIC POLYPROPYLENE SEAT
bonnet_typeINSIDE SPRING
style_designatorANGLE W/OFFSET
operating_pressure6.3 KILOGRAMS PER SQUARE CENTIMETER NOMINAL POWER DRIVE KG
valve_operation_methodAIR
bonnet_attachment_methodTHREADED
NSN4820-01-646-3618
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS — — SIZE: — · — · — PN: 81PS1F68-8/1320 · 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
•
STYLE DESIGNATOR: ANGLE W/OFFSET
•
OPERATING PRESSURE: 6.3 KILOGRAMS PER SQUARE CENTIMETER NOMINAL POWER DRIVE KG
•
BONNET TYPE: INSIDE SPRING
•
BONNET ATTACHMENT METHOD: THREADED
•
MATERIAL: PLASTIC POLYPROPYLENE SEAT
•
VALVE OPERATION METHOD: AIR
TECHNICAL CHARACTERISTICS
STYLE DESIGNATORANGLE W/OFFSET
OPERATING PRESSURE6.3 KILOGRAMS PER SQUARE CENTIMETER NOMINAL POWER DRIVE KG
BONNET TYPEINSIDE SPRING
BONNET ATTACHMENT METHODTHREADED
MATERIALPLASTIC POLYPROPYLENE SEAT
VALVE OPERATION METHODAIR
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
3/4 X 1IN NPT F&F,1320PSIG,CSSame NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 81PS1F68-8/1320?
81PS1F68-8/1320 is a VALVE,SAFETY RELIEF.
What parts can replace 81PS1F68-8/1320?
There is 1 known substitute for 81PS1F68-8/1320: 3/4 X 1IN NPT F&F,1320PSIG,CS. Substitute compatibility should be verified for your specific system.
What is the NSN for 81PS1F68-8/1320?
81PS1F68-8/1320 is cataloged in the U.S. Government catalog under NSN 4820-01-646-3618. 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.