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31M-19 — DIAPHRAGM,VALVE,FLAT

✓ Government record, cited
— · GATE VALVE
PRODUCT OVERVIEW

31M-19: DIAPHRAGM,VALVE,FLAT.

The DIAPHRAGM,VALVE,FLAT is a the manufacturer industrial component. Key specifications include material: RUBBER, special_features: COMPONENT OF VALVE,REGULATING FLUID PRESSURE;METREX VALVE CORP,MODEL MDFPM-3120C-3W-TC 3IN. W, end_item_identification: SEAWOLF CLASS SSN, media_for_which_designed: WATER.

This part is cataloged in the U.S. Government catalog under NSN 4820-01-313-5531, 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
31M-19
NSN: 4820-01-313-5531
FSC: 4820 — Valves, Nonpowered
CAGE: 21013 — METREX VALVE CORP. DBA METREX VALVE CORP (USA)
SPECIFICATIONS
materialRUBBER
special_featuresCOMPONENT OF VALVE,REGULATING FLUID PRESSURE;METREX VALVE CORP,MODEL MDFPM-3120C-3W-TC 3IN. W
end_item_identificationSEAWOLF CLASS SSN
media_for_which_designedWATER
NSN4820-01-313-5531
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS — — SIZE: — · — · — PN: 31M-19 · 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: WATER
•
MATERIAL: RUBBER
TECHNICAL CHARACTERISTICS
SPECIAL FEATURESCOMPONENT OF VALVE,REGULATING FLUID PRESSURE;METREX VALVE CORP,MODEL MDFPM-3120C-3W-TC 3IN. W
MEDIA FOR WHICH DESIGNEDWATER
END ITEM IDENTIFICATIONSEAWOLF CLASS SSN
MATERIALRUBBER
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

No substitute or cross-reference records for this part.

LIFECYCLE
NSN statusActive· U.S. Government catalog
Shelf-life managedAcquisition advice: Insurance item — stocked against contingency demandNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 31M-19?
31M-19 is a DIAPHRAGM,VALVE,FLAT.
What is the NSN for 31M-19?
31M-19 is cataloged in the U.S. Government catalog under NSN 4820-01-313-5531. 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.