Model: H555

Safety Relief Valve

Special Features:

Second end description is inlet

Properties:

Thread Class
3a 2nd end
Thread Class
3b 1st end
Thread Direction
Right-hand 2nd end
Thread Direction
Right-hand 1st end
Flow Control Device
Poppet
Bonnet Type
Packing retaining
Disk Loading Method
Spring
Valve Discharge Flow Rate
6.0 gallons per minute
Maximum Operating Temp
275.0 degrees fahrenheit single response
Connection Style
G4 gasket sea (boss) 1st end
Connection Style
G50 external seat for gasket seal (boss) 2nd end
Connection Style
External seat for gasket seal (boss) 2nd end
Connection Style
Gasket sea (boss) 1st end
Valve Operation Method
Automatic
Connection Type
Threaded external boss 2nd end
Connection Type
Threaded internal boss 1st end
Features Provided
Pressure tight outlet side
Thready Qty Per Inch (tpi)
16 1st end
Thready Qty Per Inch (tpi)
16 2nd end
Maximum Operating Pressure
35.0 pounds per square inch single response
Thread Size
0.750 inches 1st end
Thread Size
0.750 inches 2nd end
Opening Pressure Setting
48.0 pounds per square inch
Outside Diameter Tube Accommodated
0.500 inches 1st end
Outside Diameter Tube Accommodated
0.500 inches 2nd end
Material
Steel comp 303 body
Material
Steel comp 303 seat
Material
Steel comp 630 flow control device
Material Specification
Ams 5643 mfr ref 2nd material response flow control device
Material Specification
Qq-s-764, type 303-canceled federal specification 1st material response body
Material Specification
Qq-s-764, type 303-canceled federal specification 3rd material response seat
Media For Which Designed
Hydraulic fluid, mineral base single response
Thread Series Designator
Unf 2nd end
Thread Series Designator
Unjf 1st end
NSN
4820-00-451-0570
Part Number
H555
Description
Valve,safety Relief
CAGE
06239

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 H555 NSN 4820-00-451-0570

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:
0.2000lbs
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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