Model: 3R1558

Safety Relief Valve

Properties:

Thread Class
3a 1st end
Thread Direction
Right-hand 1st end
Flow Control Device
Poppet
Bonnet Type
Packing retaining
Disk Loading Method
Spring
Maximum Operating Temp
225.0 degrees fahrenheit 2nd response
Maximum Operating Temp
65.0 degrees fahrenheit 1st response
Connection Style
G42 flared (tube) 1st end
Valve Operation Method
Automatic
Connection Type
Threaded external tube 1st end
Thread Size
0.562 inches 1st end
Seat Angle
37.0 degrees 1st end
Outside Diameter Tube Accommodated
0.969 inches 1st end
Material
Rubber isobutylene-isoprene class iir packing
Material
Steel comp 303 flow control device
Material
Steel comp 630 body
Material Specification
Ams 5643 assn standard single material response body
Material Specification
Mil-s-7720 military specification single material response seat
Material Specification
Nas 1613 assn standard single material response packing
Media For Which Designed
Air 1st response
Media For Which Designed
Hydraulic fluid, phosphate-ester base 2nd response
Thread Series Designator
Unf 1st end
NSN
4820-01-110-3273
Part Number
3R1558
Description
Valve,safety Relief
CAGE
99240

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 3R1558 NSN 4820-01-110-3273

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

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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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