Model: 20303

Safety Relief Valve

Properties:

Flow Control Device
Disk
Disk Loading Method
Spring
Bolt Hole Quantity
4 all ends
Maximum Operating Temp
165.0 degrees fahrenheit single response
End Application
Ship, ohio class ss (trident)
Valve Operation Method
Automatic
Flange Shape
Round with holes all ends
Connection Type
Flange all ends
Valve Size
0.500 inches
Maximum Operating Pressure
150.0 pounds per square inch single response
Opening Pressure Setting
72.0 pounds per square inch
Outside Diameter
3.562 inches all ends
Thickness
0.375 inches all ends
First Connection Face To Centerline Distance
3.094 inches
Bolt Hole Diameter
0.500 inches all ends
Second Connection Face To Centerline Distance
3.094 inches
Bolt Circle Diameter
2.375 inches all ends
Flange Face Design
Plain swivel all ends
Material
Copper alloy body
Material
Nickel alloy stem
Material
Nickel alloy flow control device
Material Specification
Astm b164-61 assn standard single material response flow control device
Material Specification
Astm b164-61 assn standard single material response stem
Material Specification
Qq-c-390, alloy d4/d/ federal specification single material response body
Media For Which Designed
Air single response
NSN
4820-01-050-9076
Part Number
20303
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 20303 NSN 4820-01-050-9076

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:
U
ESD:
ESD:
MMAC:
CRITL:
X

Packaging & Shipping

Est. Pack Size
Est. Pack Weight
Est. Item Weight
Est. Item Dim.
Pack Size:
--
Paclk Weight:
13.5000lbs
Item Weight:
--
Item Dim:
--
OPI
SPI No.
SPI Rev.
SPC Mkg.
LVL A
LVL B
OPI:
O
SPI No.:
SPI Rev.:
SPC Mkg:
00
LVL_A:
Q
LVL_B:
Q

Freight Classification

NMFC
UFC
LTL
LCL
WCC
TCC
SHC
ACC
NMFC:
127220
UFC:
64490
LTL:
77.5
LCL:
--
WCC:
576
TCC:
Z
SHC:
9
ACC:
Construction Materials

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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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