Model: 20210H51M

Safety Relief Valve

Properties:

Pipe Size Accommodated
0.500 inches 1st end
Flow Control Device
Disk
Bonnet Type
Inside spring
Bonnet Attachment Method
Bolted
Disk Loading Method
Spring
Connection Style
G31 gasket seal (pipe) 1st end
Valve Operation Method
Automatic
Connection Type
Unthreaded internal pipe 1st end
Adjustable Pressure Range
+45.0/+55.0 pounds per square inch
Criticality Code Justification
Zzzy
Material
Copper alloy 922 body
Material
Nickel alloy 400 flow control device or nickel alloy r-405 flow control device
Material
Nickel alloy 400 seat or nickel alloy r-405 seat
Material
Nickel alloy 400 stem or nickel alloy r-405 stem
Reference Number Differentiating Characteristics
Cleaned iaw mil-i-52211
NSN
4820-01-171-4392
Part Number
20210H51M
Description
Valve,safety Relief
CAGE
15187

A valve designed to automatically release excessive pressures. It is actuated by static pressure upstream of the valve and is used as a safety valve or relief valve, and may be set to close at a predetermined pressure. It is not designed for regulation of continuously fluctuating loads. It may be inline or cartridge (manifold) design. Excludes valve (1), relief, pressure and temperature.

Part 20210H51M NSN 4820-01-171-4392

INC
FIIG
Concept No.
App. Key
Cond. Code
Status
INC:
05488
FIIG:
A046B0
Concept No.:
1
App. Key:
AP
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:
A
ESD:
ESD:
MMAC:
CRITL:
X

Packaging & Shipping

Est. Pack Size
Est. Pack Weight
Est. Item Weight
Est. Item Dim.
Pack Size:
--
Paclk Weight:
2.0000lbs
Item Weight:
--
Item Dim:
--
OPI
SPI No.
SPI Rev.
SPC Mkg.
LVL A
LVL B
OPI:
O
SPI No.:
SPI Rev.:
SPC Mkg:
ZZ
LVL_A:
Q
LVL_B:
Q

Freight Classification

NMFC
UFC
LTL
LCL
WCC
TCC
SHC
ACC
NMFC:
127220
UFC:
64490
LTL:
77.5
LCL:
77.5
WCC:
594
TCC:
Z
SHC:
9
ACC:
Trailers/Vehicles

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Schedule B and Export
  • Schedule B: 8481400000
  • SITC: 74740
  • End Use: Industrial machines, other
  • NAICS: 332911
  • USDA: 1

Freight Class: Safety or relief valves

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