PartsTable TECHNICAL DATA SHEET

NSN 4820-01-388-4664Government record, cited

Valve, Safety Relief4820-01-388-4664

NSN 4820-01-388-4664 · NIIN 013884664 · Part number PWA57755-2

Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney · FSC 4820 — Valves, Nonpowered · FSG 48 — Valves · CAGE 77445

Government record, cited

NSN 4820-01-388-4664 — this item is cataloged by the U.S. Government under National Stock Number 4820-01-388-4664. Manufacturer of record part number: PWA57755-2.

Also searched as 4820-01-388-4664 · 4820013884664 · NIIN 013884664 · 01-388-4664 · FSC 4820 Valves, Nonpowered · CAGE 77445 · PWA57755-2 · 628XB-3-6-2 · 628XB-3-6-2

Nearby stock numbers ← 4820-01-388-4663 Parts Kit, Valve · 4820-01-388-4672 Guide, Diaphragm, Valve →

4820-01-388-4664 — Valves, Nonpowered

Features

Valve,safety Relief — FSC 4820
Flow Control Device: DISK
Valve Operation Method: AUTOMATIC
2 manufacturer part numbers on file
Manufacturer of record: Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney

Identification

NSN: 4820-01-388-4664
NIIN: 013884664
FSC: 4820 — Valves, Nonpowered
FSG: 48 — Valves
Primary part number: PWA57755-2
Manufacturer: Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney

General Description

The Valve,safety Relief, cataloged under National Stock Number 4820-01-388-4664, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney. Government technical data includes 2 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.

Technical Specifications

Parameter	Value
NSN	4820-01-388-4664
Primary Part Number	PWA57755-2
Item Name	Valve,safety Relief
FSC / FSG	4820 / 48 — Valves, Nonpowered
Manufacturer	Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney
Status	ACTIVE
Flow Control Device	DISK
Valve Operation Method	AUTOMATIC

Lifecycle & Compliance

Acquisition Status	ACTIVE
DEMIL Code	DEMIL A — No Demilitarization Required
Hazard	No hazard code in the DLA record (HMIC N)
Criticality Code	X

Cross-Reference Index

Part Number	Manufacturer
PWA57755-2 PRIMARY	Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney (USA)
628XB-3-6-2	Parker-Hannifin Corporation Dba Pneutronics Div Hydraulic Valve Division (USA)

Reference documents

Reference	Meaning
628XB-3-6-2	5/9 Secondary reference U.S. Government activity

No interchangeability data on file.

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

4820-00-000-0097 · Item name not on file

4820-00-001-0010

VALVE,ROTARY,SELECTOR

4820-00-001-0020

4820-00-001-0020 · Item name not on file

4820-00-001-0021

4820-00-001-0021 · Item name not on file

4820-00-001-0032

4820-00-001-0032 · Item name not on file

4820-00-001-0037

VALVE,SAFETY RELIEF

4820-00-001-0042

4820-00-001-0042 · Item name not on file

4820-00-001-1230

4820-00-001-1230 · Item name not on file

Frequently Asked Questions

What is NSN 4820-01-388-4664?

NSN 4820-01-388-4664 is a Valve,safety Relief, manufactured by Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney, classified under FSC 4820, Valves, Nonpowered. Status: active.

What part numbers are listed for NSN 4820-01-388-4664?

NSN 4820-01-388-4664 has 2 manufacturer part numbers on file: PWA57755-2 (Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney), 628XB-3-6-2 (Parker-Hannifin Corporation Dba Pneutronics Div Hydraulic Valve Division).

What are the specifications of PWA57755-2?

Key specifications for PWA57755-2: Flow Control Device: DISK; Valve Operation Method: AUTOMATIC. 2 specifications are documented in the U.S. Government catalog.

Is NSN 4820-01-388-4664 hazardous material?

No hazard code in the DLA record (HMIC N). Hazard information on this page is shown exactly as it appears in the DLA record.

Sources

U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-16.

U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.

✓ Data cited from the U.S. Government catalog; commercial cross-references from OEM and certified industry sources.

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