Model: 20206L51M

Safety Relief Valve

Special Features:

Pfor gas service; vent must be open to atmosphere or piped to downstream piping; vent plug (find no. 27) and associated o-ring (find no. 28) are not to be installed when valve is used in an air system; has monel trim

Properties:

Pipe Size Accommodated
1.000 inches all ends
Flow Control Device
Disk
Bonnet Type
Inside spring
Bonnet Attachment Method
Bolted
Disk Loading Method
Spring
Renewable Seat Ring Type
Pressed-in
Maximum Operating Temp
165.0 degrees fahrenheit single response
Valve Operation Method
Automatic
Connection Type
Unthreaded internal pipe all ends
Adjustable Pressure Range
+76.0/+90.0 pounds per square inch
Maximum Operating Pressure
1500.0 pounds per square inch single response
Part Name Assigned By Controlling Agency
1" relief valve type 1751t
Material
Copper alloy 922 body
Material
Nickel alloy seat
Material
Nickel alloy stem
Material
Nickel alloy flow control device
Material Specification
Astm b-61 assn standard single material response body
Material Specification
Qq-n-281 federal specification 1st material response flow control device and ams 3660 assn standard 2nd material response flow control device
Material Specification
Qq-n-281 federal specification single material response seat
Material Specification
Qq-n-281 federal specification single material response stem
Furnished Items And Quantity
2 tailpiece and 2 nut and 1 plugged drain and 1 relief plug
NSN
4820-01-495-5307
Part Number
20206L51M
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 20206L51M NSN 4820-01-495-5307

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

Packaging & Shipping

Est. Pack Size
Est. Pack Weight
Est. Item Weight
Est. Item Dim.
Pack Size:
--
Paclk Weight:
--
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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