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Technical Data Sheet
PartsTable / COMPONENT / C1951
C1951 ✓ Verified by PartsTable
— · GATE VALVE
WHAT YOU NEED TO KNOW
Full open or full close only — never throttle Rising stem shows position visually
Throttling a gate valve erodes seats
PRODUCT OVERVIEW

The DIAPHRAGM,VALVE,FLAT is a the manufacturer industrial component. Key specifications include material: RUBBER CHLOROPRENE CLASS CR, hole_diameter: 0.312 INCHES NOMINAL IN, outside_diameter: 5.022 INCHES NOMINAL IN, style_designator: FLAT, material_thickness: 0.050 INCHES NOMINAL IN, bolt_circle_diameter: 4.719 INCHES NOMINAL IN. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4820-00-306-1213, 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
C1951
NSN: 4820-00-306-1213
FSC: 4820
CAGE: 86184 — GRISWOLD INDUSTRIES DBA CLA-VAL CO (USA)
SPECIFICATIONS
materialRUBBER CHLOROPRENE CLASS CR
hole_diameter0.312 INCHES NOMINAL IN
outside_diameter5.022 INCHES NOMINAL IN
style_designatorFLAT
bolt_hole_quantity9
material_thickness0.050 INCHES NOMINAL IN
bolt_circle_diameter4.719 INCHES NOMINAL IN
center_hole_diameter0.563 INCHES NOMINAL IN
criticality_code_justificationZZZY
reference_number_differentiating_characteristicsMATERIAL WILL BE IN ACCORDANCE WITH NAVICP MECH; ACTIVITY HX QUALITY CONTROL, MANUFACTURING AND TESTING SPECIFICATIONS.
NSN4820-00-306-1213
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS — — SIZE: — · — · — PN: C1951 · 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
•
STYLE DESIGNATOR: FLAT
•
BOLT HOLE QUANTITY: 8
•
MATERIAL THICKNESS: 0.050 INCHES NOMINAL IN
•
MATERIAL: RUBBER SYNTHETIC AND PLASTIC POLYAMIDE NYLON
•
OUTSIDE DIAMETER: 5.219 INCHES NOMINAL IN
•
HOLE DIAMETER: 0.312 INCHES NOMINAL IN
•
CENTER HOLE DIAMETER: 0.438 INCHES NOMINAL IN
•
BOLT CIRCLE DIAMETER: 4.719 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
STYLE DESIGNATORFLAT
BOLT HOLE QUANTITY8
MATERIAL THICKNESS0.050 INCHES NOMINAL IN
MATERIALRUBBER SYNTHETIC AND PLASTIC POLYAMIDE NYLON
OUTSIDE DIAMETER5.219 INCHES NOMINAL IN
HOLE DIAMETER0.312 INCHES NOMINAL IN
CENTER HOLE DIAMETER0.438 INCHES NOMINAL IN
BOLT CIRCLE DIAMETER4.719 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 7
C1951Interchangeable
interchangeable cross-reference
interchangeable
4C-1951HInterchangeable
interchangeable cross-reference
interchangeable
73201PC4Interchangeable
interchangeable cross-reference
interchangeable
C1951H 1 1-4INInterchangeable
interchangeable cross-reference
interchangeable
81110Interchangeable
interchangeable cross-reference
interchangeable
81110 FIND NO. 7Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is C1951?
C1951 is a DIAPHRAGM,VALVE,FLAT.
What parts can replace C1951?
There are 7 known substitutes for C1951: C1951, 4C-1951H, 73201PC4 and 4 more. Substitute compatibility should be verified for your specific system.
What is the NSN for C1951?
C1951 is cataloged in the Federal Logistics Information System (FLIS) under NSN 4820-00-306-1213. This indicates validated use in U.S. government and defense supply chains.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026