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66859 PIECE 7 — DIAPHRAGM,VALVE,FLAT

✓ Government record, cited
— · GATE VALVE
PRODUCT OVERVIEW

66859 PIECE 7: DIAPHRAGM,VALVE,FLAT.

The DIAPHRAGM,VALVE,FLAT is a the manufacturer industrial component. Key specifications include material: RUBBER SYNTHETIC, hole_diameter: 0.200 INCHES NOMINAL IN, outside_diameter: 3.135 INCHES NOMINAL IN, style_designator: FLAT, material_thickness: 0.035 INCHES NOMINAL IN, bolt_circle_diameter: 2.650 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 4820-00-689-1902, 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
66859 PIECE 7
NSN: 4820-00-689-1902
FSC: 4820 — Valves, Nonpowered
CAGE: 86184 — GRISWOLD INDUSTRIES DBA CLA-VAL CO (USA)
SPECIFICATIONS
materialRUBBER SYNTHETIC
hole_diameter0.200 INCHES NOMINAL IN
outside_diameter3.135 INCHES NOMINAL IN
style_designatorFLAT
bolt_hole_quantity8
material_thickness0.035 INCHES NOMINAL IN
bolt_circle_diameter2.650 INCHES NOMINAL IN
center_hole_diameter0.250 INCHES NOMINAL IN
NSN4820-00-689-1902
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS — — SIZE: — · — · — PN: 66859 PIECE 7 · 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: 3.135 INCHES NOMINAL IN
•
STYLE DESIGNATOR: FLAT
•
MATERIAL THICKNESS: 0.035 INCHES NOMINAL IN
•
BOLT HOLE QUANTITY: 8
•
BOLT CIRCLE DIAMETER: 2.650 INCHES NOMINAL IN
•
CENTER HOLE DIAMETER: 0.250 INCHES NOMINAL IN
•
MATERIAL: RUBBER SYNTHETIC
•
HOLE DIAMETER: 0.200 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
OUTSIDE DIAMETER3.135 INCHES NOMINAL IN
STYLE DESIGNATORFLAT
MATERIAL THICKNESS0.035 INCHES NOMINAL IN
BOLT HOLE QUANTITY8
BOLT CIRCLE DIAMETER2.650 INCHES NOMINAL IN
CENTER HOLE DIAMETER0.250 INCHES NOMINAL IN
MATERIALRUBBER SYNTHETIC
HOLE DIAMETER0.200 INCHES NOMINAL IN
SUBSTITUTES & CROSS-REFERENCES 2
66859Reference document
Same NSN cross-reference
Reference document — Drawing number reference only
67377Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
LIFECYCLE
NSN statusCancelled· U.S. Government catalog
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 66859 PIECE 7?
66859 PIECE 7 is a DIAPHRAGM,VALVE,FLAT.
What parts can replace 66859 PIECE 7?
There are 2 known substitutes for 66859 PIECE 7: 66859, 67377. Substitute compatibility should be verified for your specific system.
What is the NSN for 66859 PIECE 7?
66859 PIECE 7 is cataloged in the U.S. Government catalog under NSN 4820-00-689-1902. 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.