Model: 51-391PC580

Safety Relief Valve

Properties:

Pipe Size Accommodated
1.250 inches 1st end
Thread Direction
Right-hand all ends
Flow Control Device
Disk
Bonnet Type
Exposed spring
Bonnet Attachment Method
Union
Disk Loading Method
Spring
Maximum Operating Temp
350.0 degrees fahrenheit 2nd response
Maximum Operating Temp
425.0 degrees fahrenheit 1st response
Connection Style
G9 plain, optional en (pipe) all ends
Connection Style
Plain, optional en (pipe) all ends
Valve Operation Method
Automatic or manual
Connection Type
Threaded internal pipe all ends
Features Provided
Valve stem lock shield
Adjustable Pressure Range
+4.0/+9.0 pounds per square inch
Maximum Operating Pressure
200.0 pounds per square inch 1st response
Maximum Operating Pressure
300.0 pounds per square inch 2nd response
Thread Size
1.250 inches all ends
Material
Copper alloy flow control device
Material
Copper alloy stem
Material
Copper alloy body
Material
Nickel alloy seat
Media For Which Designed
Steam 1st response
Media For Which Designed
Air 2nd response
Style Designator
Angle
Thread Series Designator
Npt all ends
NSN
4820-00-287-4105
Part Number
51-391PC580
Description
Valve,safety Relief
CAGE
70876

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 51-391PC580 NSN 4820-00-287-4105

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:
5.0000lbs
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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