The Block,relief Valve, cataloged under National Stock Number 2835-00-343-9985, is classified within Federal Supply Class 2835 (Gas Turbines and Jet Engines; Non-aircraft Prime Mover, Aircraft Non-prime Mover, and Components) of the Engines, Turbines, and Components group. The manufacturer of record is Rtx Corporation Div Pratt & Whitney. Government technical data includes 1 specification, 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 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 | 2835-00-343-9985 |
| Primary Part Number | 13078 |
| Item Name | Block,relief Valve |
| FSC / FSG | 2835 / 28 — Gas Turbines and Jet Engines; Non-aircraft Prime Mover, Aircraft Non-prime Mover, and Components |
| Manufacturer | Rtx Corporation Div Pratt & Whitney |
| Status | ACTIVE |
| General Characteristics Item Description | MATL: ALUMINUM ALLOY PER QQ-A-355 TEMP T3; DIM.:2.38 IN. NOM LG,2.12 IN. NOM W,0.422 IN. NOM THK,0.196 IN. MIN AND 0.202 IN. MAX DIA DRILLED THRU 2 HOLES FOR HELI-COIL TAP IN |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
NSN 2835-00-343-9985 is a Block,relief Valve, manufactured by Rtx Corporation Div Pratt & Whitney, classified under FSC 2835, Gas Turbines and Jet Engines; Non-aircraft Prime Mover, Aircraft Non-prime Mover, and Components. Status: active.
NSN 2835-00-343-9985 has 2 manufacturer part numbers on file: 13078 (Rtx Corporation Div Pratt & Whitney), 13078 (Alamo Aircraft, Ltd.).
1 possible match (shared part number, not a government interchangeability claim): 6240-01-074-4599. Verify interchangeability with system specifications before substitution.
Key specifications for 13078: General Characteristics Item Description: MATL: ALUMINUM ALLOY PER QQ-A-355 TEMP T3; DIM.:2.38 IN. NOM LG,2.12 IN. NOM W,0.422 IN. NOM THK,0.196 IN. MIN AND 0.202 IN. MAX DIA DRILLED THRU 2 HOLES FOR HELI-COIL TAP IN. 1 specification is 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.
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.