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LL-1552 — VALVE,SAFETY RELIEF

✓ Government record, cited
— · GATE VALVE
PRODUCT OVERVIEW

LL-1552: VALVE,SAFETY RELIEF.

The VALVE,SAFETY RELIEF is a the manufacturer industrial component. Key specifications include material: STEEL BODY, mounting_facility: THREADED FASTENER, flow_control_device: PLUG, valve_operation_method: AUTOMATIC, part_name_assigned_by_controlling_agency: RELIEF CONTROL HEAD VALVE. This part is cataloged in the U.S.

Government catalog under NSN 4820-01-508-4081, 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
LL-1552
NSN: 4820-01-508-4081
FSC: 4820 — Valves, Nonpowered
CAGE: 55107 — OLMSTED PRODUCTS COMPANY LLC (USA)
SPECIFICATIONS
materialSTEEL BODY
special_featuresUSED AS A 2ND STAGE RELIEF VALVE SUB-ASSY ON SV115 PRIMARY RELIEF VALVE; LIKE 4820-01-185-6666 IN ALL WAYS EXCEPT INCLUDES ORIFICE PLUG AND SEAL PLATE. IN
mounting_facilityTHREADED FASTENER
flow_control_devicePLUG
valve_operation_methodAUTOMATIC
part_name_assigned_by_controlling_agencyRELIEF CONTROL HEAD VALVE
NSN4820-01-508-4081
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS — — SIZE: — · — · — PN: LL-1552 · 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: PLUG
•
MOUNTING FACILITY: THREADED FASTENER
•
MATERIAL: STEEL BODY
•
VALVE OPERATION METHOD: AUTOMATIC
TECHNICAL CHARACTERISTICS
FLOW CONTROL DEVICEPLUG
MOUNTING FACILITYTHREADED FASTENER
SPECIAL FEATURESUSED AS A 2ND STAGE RELIEF VALVE SUB-ASSY ON SV115 PRIMARY RELIEF VALVE; LIKE 4820-01-185-6666 IN ALL WAYS EXCEPT INCLUDES ORIFICE PLUG AND SEAL PLATE. IN
PART NAME ASSIGNED BY CONTROLLING AGENCYRELIEF CONTROL HEAD VALVE
MATERIALSTEEL 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 2
M0192AReference document
Same NSN cross-reference
Reference document — Secondary reference
LL-1552 REV B MODEL M0192AReference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Insurance item — stocked against contingency demandNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is LL-1552?
LL-1552 is a VALVE,SAFETY RELIEF.
What parts can replace LL-1552?
There are 2 known substitutes for LL-1552: M0192A, LL-1552 REV B MODEL M0192A. Substitute compatibility should be verified for your specific system.
What is the NSN for LL-1552?
LL-1552 is cataloged in the U.S. Government catalog under NSN 4820-01-508-4081. 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.