The Valve,check, cataloged under National Stock Number 4820-01-537-1532, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Flowserve Inc. Government technical data includes 10 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 4820-01-537-1532 |
| Primary Part Number | SWS701-08 1.50IN |
| Item Name | Valve,check |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Flowserve Inc |
| Status | ACTIVE |
| Furnished Items and Quantity | 1 GASKET |
| Nominal Pipe Size Accommodated | 1.250 INCHES ALL ENDS IN |
| Connection Style | SOCKET (PIPE) ALL ENDS |
| Connection Type | BUTT WELD PIPE ALL ENDS |
| Style Designator | STRAIGHT THRU |
| Material Document and Classification | ASTM A105 ASSN STD SINGLE MATERIAL RESPONSE BODY |
| Valve Size | 1.500 INCHES IN |
| Face to Face Distance | 5.440 INCHES IN |
| Material | STEEL BODY |
| Valve Operation Method | AUTOMATIC |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| 59439-2,R 01 ASY SWS701-08 1.5IN | Flowserve Inc (USA) |
| SWS701-08 1.50IN PRIMARY | Flowserve Inc (USA) |
| Reference | Meaning |
|---|---|
| 59439-2 | D/9 Drawing number reference only Flowserve Inc |
NSN 4820-01-537-1532 is a Valve,check, manufactured by Flowserve Inc, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-537-1532 has 2 manufacturer part numbers on file: 59439-2,R 01 ASY SWS701-08 1.5IN (Flowserve Inc), SWS701-08 1.50IN (Flowserve Inc).
1 possible match (shared part number, not a government interchangeability claim): 4820-01-537-1537. Verify interchangeability with system specifications before substitution.
Key specifications for SWS701-08 1.50IN: Furnished Items and Quantity: 1 GASKET; Nominal Pipe Size Accommodated: 1.250 INCHES ALL ENDS IN; Connection Style: SOCKET (PIPE) ALL ENDS; Connection Type: BUTT WELD PIPE ALL ENDS. 10 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.
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.