Model: 639XB2-4-2

Safety Relief Valve

Properties:

Thread Class
3a all ends
Thread Direction
Right-hand all ends
Flow Control Device
Poppet
Bonnet Type
Inside spring
Bonnet Attachment Method
Threaded
Disk Loading Method
Spring
Maximum Operating Temp
225.0 degrees fahrenheit single response
Connection Style
G42 flared (tube) all ends
Valve Operation Method
Automatic
Connection Type
Threaded external tube all ends
Adjustable Pressure Range
+10.0/+50.0 pounds per square inch
Maximum Operating Pressure
50.0 pounds per square inch single response
Thread Size
0.438 inches all ends
Seat Angle
37.0 degrees all ends
Opening Pressure Setting
35.0 pounds per square inch
Outside Diameter Tube Accommodated
0.250 inches all ends
Material
Copper alloy body
Material
Rubber synthetic seat
Material
Steel comp 303 flow control device
Material Specification
Fed standard 66, aisi 303/sae 30303 federal standard single material response flow control device
Material Specification
Qq-b-626, alloy 360 federal specification single material response body
Media For Which Designed
Water-oil-gas 2nd response
Media For Which Designed
Air 1st response
Thread Series Designator
Unjf all ends
NSN
4820-01-011-6156
Part Number
639XB2-4-2
Description
Valve,safety Relief
CAGE
86768

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 639XB2-4-2 NSN 4820-01-011-6156

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:
--
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

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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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