Model: 581R855H01

Safety Relief Valve

Properties:

Thread Class
3a 1st end
Thread Direction
Right-hand 1st end
Flow Control Device
Poppet
Disk Loading Method
Spring
Valve Discharge Flow Rate
40.0 cubic feet per minute
Maximum Operating Temp
-40.0 degrees fahrenheit 1st response280.0 degrees fahrenheit 2nd response
Connection Style
G46a plain (tube) 1st end
Valve Operation Method
Automatic
Connection Type
Threaded external tube 1st end
Thready Qty Per Inch (tpi)
16 1st end
Maximum Operating Pressure
200.0 pounds per square inch single response
Thread Size
0.750 inches 1st end
Opening Pressure Setting
45.0 pounds per square inch
Material
Aluminum alloy 2024 seat
Material
Aluminum alloy 2024 body
Material
Steel comp 303 flow control device
Material Specification
Qq-a-225/6, alloy 2024, t4 federal specification single material response body
Material Specification
Qq-a-225/6, alloy 2024, t4 federal specification single material response seat
Material Specification
Qq-s-764, type 303-canceled federal specification single material response flow control device
Media For Which Designed
Air 1st response
Media For Which Designed
Alcohol, ethyl 2nd response
Media For Which Designed
Ammonia, gaseous 3rd response
Media For Which Designed
Fuel/oil, hydrocarbon 4th response
Media For Which Designed
Helium 5th response
Surface Treatment
Anodize
Surface Treatment Specification
Mil-a-8625, type 1, class 1 military specification single treatment response
Thread Series Designator
Unjf 1st end
Furnished Items And Quantity
1 deflector cap
NSN
4820-01-088-2874
Part Number
581R855H01
Description
Valve,safety Relief
CAGE
97942

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 581R855H01 NSN 4820-01-088-2874

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:
SX
CRITL:
X

Packaging & Shipping

Est. Pack Size
Est. Pack Weight
Est. Item Weight
Est. Item Dim.
Pack Size:
--
Paclk Weight:
0.1000lbs
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:
594
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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