Model: 20274K51M

Safety Relief Valve

Properties:

Pipe Size Accommodated
0.500 inches all ends
Flow Control Device
Disk
Bonnet Type
Inside spring
Bonnet Attachment Method
Threaded
Disk Loading Method
Spring
Valve Discharge Flow Rate
101.0 cubic feet per minute
Maximum Operating Temp
400.0 degrees fahrenheit single response
Connection Style
Socket all ends
Valve Operation Method
Automatic
Connection Type
Unthreaded internal pipe all ends
Features Provided
Pressure tight outlet side
Adjustable Pressure Range
+46.0/+72.0 pounds per square inch
Maximum Operating Pressure
400.0 pounds per square inch single response
Opening Pressure Setting
72.0 pounds per square inch
Material
Nickel alloy seat
Material
Nickel alloy stem
Material
Nickel alloy body
Material
Nickel alloy flow control device and plastic polytetrafluoroethylene flow control device
Material Specification
Qq-n-281 federal specification 1st material response body or qq-n-288 federal specification 2nd material response body
Material Specification
Qq-n-281 federal specification 1st material response seat or qq-n-288 federal specification 2nd material response seat
Material Specification
Qq-n-281 federal specification 1st material response stem or qq-n-288 federal specification 2nd material response stem
Media For Which Designed
Air single response
Style Designator
Angle
Test Data Document
81349-mil-s-901 specification (includes engineering type bulletins, brochures, etc., that reflect specification type data in specification format; excludes commercial catalogs, industry directories, and similar trade publications, reflecting general type data on certain environmental and performance requirements and test conditions that are shown as "typical", "average", "", etc.).
Furnished Items And Quantity
2 nut and 1 lever and 2 tailpiece
Specification Data
81349-mil-v-22549 government specification
NSN
4820-00-166-8791
Part Number
20274K51M
Description
Valve,safety Relief
CAGE
01343

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 20274K51M NSN 4820-00-166-8791

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:
11.5000lbs
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:
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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