Model: D537A4D25

Safety Relief Valve

Properties:

Thread Class
3a 1st end
Thread Direction
Right-hand 1st end
Flow Control Device
Poppet
Disk Loading Method
Spring
Maximum Operating Temp
250.0 degrees fahrenheit single response
Connection Style
External seat for gasket seal (boss) 1st end
Valve Operation Method
Automatic
Connection Type
Threaded external boss 1st end
Adjustable Pressure Range
+10.0/+30.0 pounds per square inch
Maximum Operating Pressure
200.0 pounds per square inch single response
Thread Size
0.437 inches 1st end
Opening Pressure Setting
25.0 pounds per square inch
Outside Diameter Tube Accommodated
0.250 inches 1st end
Material
Aluminum alloy 2024 body
Material
Aluminum alloy 2024 flow control device and rubber butadiene-acrylonitrile class nbr flow control device
Material
Aluminum alloy 2024 seat
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 flow control device
Material Specification
Qq-a-225/6, alloy 2024, t4 federal specification single material response seat
Media For Which Designed
Fuel/oil, hydrocarbon 2nd response
Media For Which Designed
Helium 3rd response
Media For Which Designed
Hydrogen 4th response
Media For Which Designed
Air 1st response
Media For Which Designed
Ammonia, gaseous 5th response
Surface Treatment
Anodize
Style Designator
Straight through w/baffle
Thread Series Designator
Unf 1st end
NSN
4820-00-420-5485
Part Number
D537A4D25
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 D537A4D25 NSN 4820-00-420-5485

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

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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