PartsTable
Technical Data Sheet
Download PDF

20WR21 — DISK,VALVE

✓ Government record, cited
— · GATE VALVE
PRODUCT OVERVIEW

20WR21: DISK,VALVE.

The DISK,VALVE is a the manufacturer industrial component. Key specifications include material: LEATHER AND RUBBER, overall_height: 0.188 INCHES NOMINAL IN, inside_diameter: 1.094 INCHES NOMINAL IN, outside_diameter: 2.250 INCHES NOMINAL IN, style_designator: PLAIN. This part is cataloged in the U.S.

Government catalog under NSN 4820-00-489-4904, 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
20WR21
NSN: 4820-00-489-4904
FSC: 4820 — Valves, Nonpowered
CAGE: 77653 — ROSS VALVE MANUFACTURING COMPANY, INC. DIV ROSS VALVE MFG CO. (USA)
SPECIFICATIONS
materialLEATHER AND RUBBER
overall_height0.188 INCHES NOMINAL IN
inside_diameter1.094 INCHES NOMINAL IN
outside_diameter2.250 INCHES NOMINAL IN
style_designatorPLAIN
NSN4820-00-489-4904
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS — — SIZE: — · — · — PN: 20WR21 · 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
•
OUTSIDE DIAMETER: 2.250 INCHES NOMINAL IN
•
STYLE DESIGNATOR: PLAIN
•
INSIDE DIAMETER: 1.094 INCHES NOMINAL IN
•
MATERIAL: LEATHER AND RUBBER
TECHNICAL CHARACTERISTICS
OVERALL HEIGHT0.188 INCHES NOMINAL IN
OUTSIDE DIAMETER2.250 INCHES NOMINAL IN
STYLE DESIGNATORPLAIN
INSIDE DIAMETER1.094 INCHES NOMINAL IN
MATERIALLEATHER AND RUBBER
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
No demilitarization required
Ready to buy 20WR21?
Compare prices from verified sellers on eBay
Buy on eBay →
As an eBay Partner, PartsTable may earn a commission. Your price is not affected.
FREQUENTLY ASKED QUESTIONS
What is 20WR21?
20WR21 is a DISK,VALVE.
What is the NSN for 20WR21?
20WR21 is cataloged in the U.S. Government catalog under NSN 4820-00-489-4904. This indicates validated use in U.S. government and defense supply chains.
Community Feedback
Leave a Comment
Comments are reviewed before appearing. You will receive an email to verify before your comment appears.

Request a Quote — 20WR21

✓ 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.