Model: D559B-2M-20

Safety Relief Valve

Special Features:

Max operting pressure and temp, 200 lb psi, 280 degrees f; designed for air, alcohol, ammonia, hydrocarbon fuel/oil, helium, hydrogen, and gaseous nitrogen

Properties:

Thread Direction
Right-hand all ends
Flow Control Device
Poppet
Disk Loading Method
Spring
Maximum Operating Temp
-40.0 degrees fahrenheit 1st response
Maximum Operating Temp
250.0 degrees fahrenheit 2nd response
Connection Style
G46b plain (pipe) 1st end
Valve Operation Method
Automatic
Connection Type
Threaded external pipe 1st end
Mounting Facility
Threaded fastener
Adjustable Pressure Range
+0.5/+150.0 pounds per square inch
Maximum Operating Pressure
200.0 pounds per square inch single response
Thread Size
0.250 inches all ends
Opening Pressure Setting
20.0 pounds per square inch
Material
Copper alloy body
Material
Rubber butadiene-acrylonitrile class nbr packing
Media For Which Designed
Refrigerant 12 4th response
Media For Which Designed
Acetylene 2nd response
Media For Which Designed
Air 1st response
Media For Which Designed
Ammonia, gaseous 3rd response
Media For Which Designed
Hydrogen 5th response
Thread Series Designator
Npt 1st end
Furnished Items And Quantity
1 deflector cap
NSN
4820-01-130-0654
Part Number
D559B-2M-20
Description
Valve,safety Relief
CAGE
91816

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 D559B-2M-20 NSN 4820-01-130-0654

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

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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