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B43813-1 — DIAPHRAGM,VALVE,FLAT

✓ Government record, cited
— · GATE VALVE
PRODUCT OVERVIEW

B43813-1: DIAPHRAGM,VALVE,FLAT.

The DIAPHRAGM,VALVE,FLAT is a the manufacturer industrial component. Key specifications include material: RUBBER CHLOROPRENE CLASS CR, end_item_identification: 4820-01-520-4351 SAFETY RELIEF VALVE, 2 INCH IN, media_for_which_designed: REFRIGERANT. This part is cataloged in the U.S.

Government catalog under NSN 4820-01-520-4420, 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
B43813-1
NSN: 4820-01-520-4420
FSC: 4820 — Valves, Nonpowered
CAGE: 04577 — MISSION SYSTEMS ORCHARD PARK INC (USA)
SPECIFICATIONS
materialRUBBER CHLOROPRENE CLASS CR
end_item_identification4820-01-520-4351 SAFETY RELIEF VALVE, 2 INCH IN
media_for_which_designedREFRIGERANT
NSN4820-01-520-4420
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS — — SIZE: — · — · — PN: B43813-1 · 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
•
MEDIA FOR WHICH DESIGNED: REFRIGERANT
•
MATERIAL: RUBBER CHLOROPRENE CLASS CR
TECHNICAL CHARACTERISTICS
MEDIA FOR WHICH DESIGNEDREFRIGERANT
END ITEM IDENTIFICATION4820-01-520-4351 SAFETY RELIEF VALVE, 2 INCH IN
MATERIALRUBBER CHLOROPRENE CLASS CR
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 1
B16511-3 ITEM 4Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
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 B43813-1?
B43813-1 is a DIAPHRAGM,VALVE,FLAT.
What parts can replace B43813-1?
There is 1 known substitute for B43813-1: B16511-3 ITEM 4. Substitute compatibility should be verified for your specific system.
What is the NSN for B43813-1?
B43813-1 is cataloged in the U.S. Government catalog under NSN 4820-01-520-4420. 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.