Model: 20B21

Check Valve
Description:

3a all ends thread class, right-hand all ends , disk flow control device, spring disk loading method, flared (tube) all ends connection style.

Special Features:

Bulkhead thd first end

Properties:

Thread Class
3a all ends
Thread Direction
Right-hand all ends
Flow Control Device
Disk
Disk Loading Method
Spring
Connection Style
Flared (tube) all ends
Valve Operation Method
Automatic
Connection Type
Threaded external tube all ends
Mounting Position
Horizontal or vertical
Thready Qty Per Inch (tpi)
16 all ends
Maximum Operating Pressure
500.0 pounds per square inch single response
Thread Size
0.750 inches all ends
Seat Angle
37.0 degrees all ends
Outside Diameter Tube Accommodated
0.500 inches all ends
Material
Aluminum alloy body
Material
Aluminum alloy seat
Material
Stainless steel flow control device
Surface Treatment
Anodize
Style Designator
Straight thru
Thread Series Designator
Unf all ends
NSN
4820-00-013-1292
Part Number
20B21
Description
Valve,check
CAGE

A valve permitting flow in one direction only. It does not have a stem, except when equipped with a lever and weight and has no pressure adjustment. It may be inline or cartridge (manifold) design.

Part 20B21 NSN 4820-00-013-1292

INC
FIIG
Concept No.
App. Key
Cond. Code
Status
INC:
05487
FIIG:
A530B0
Concept No.:
1
App. Key:
Cond. Code:
1
Status:
A

Material Classification

Hazardous material, precious metals, criticality, enviroment, and electrostatic discharge indicators
HMIC
PMIC
ESD/EMI
ENAC
MMAC
CRITL
HMIC:
N
PMIC:
U
ESD:
ESD:
MMAC:
CRITL:
X

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Schedule B and Export
  • Schedule B: 8481309000
  • SITC: 74730
  • End Use: Industrial machines, other
  • NAICS: 332911
  • USDA: 1

Freight Class: Check valves of materials other than copper, iron or steel

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