The Diaphragm,actuator Valve,special, cataloged under National Stock Number 4820-00-341-9475, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is John Crane, Inc. Government technical data includes 4 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-00-341-9475 |
| Primary Part Number | R1344 |
| Item Name | Diaphragm,actuator Valve,special |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | John Crane, Inc |
| Status | ACTIVE |
| FSC Application Data | AIRCRAFT HYDRAULIC,VACUUM,DEICING SYSTEMS |
| Material Document and Classification | AMS 3651 ASSN STD SINGLE MATERIAL RESPONSE |
| Media for Which Designed | HYDRAULIC FLUID |
| Material | PLASTIC POLYTETRAFLUOROETHYLENE |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL B — Remove Demilitarization Key Points |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| R1344 PRIMARY | John Crane, Inc (USA) |
| Reference | Meaning |
|---|---|
| B605-1 | 5/9 Secondary reference Performance Plastics Products Inc |
| 750346-3 | 7/2 Vendor item drawing reference U.S. Government activity |
NSN 4820-00-341-9475 is a Diaphragm,actuator Valve,special, manufactured by John Crane, Inc, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-00-341-9475 has 1 manufacturer part number on file: R1344 (John Crane, Inc).
1 possible match (shared part number, not a government interchangeability claim): 5910-00-780-8216. Verify interchangeability with system specifications before substitution.
Key specifications for R1344: FSC Application Data: AIRCRAFT HYDRAULIC,VACUUM,DEICING SYSTEMS; Material Document and Classification: AMS 3651 ASSN STD SINGLE MATERIAL RESPONSE; Special Features: DIMENSIONS IN INCHES: 4.070 EXTENDED LENGTH,1.820 CONTRACTED LENGTH,FLANGE BASE PROVIDED,12 MOUNTING HOLES0.2635 DIAMETER EQUALLY SPACED ON 7.840 DIAMETER BOLT CIRCLE; Media for Which Designed: HYDRAULIC FLUID. 4 specifications are documented in the U.S. Government catalog.
No hazard code in the DLA record (HMIC N). Hazard information on this page is shown exactly as it appears in the DLA record.
NSN 4820-00-341-9475 has DEMIL Code B. Demilitarization may be required before disposal or transfer to non-military entities.
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.