Model: N551

Fluid Pressure Regulating Valve

Special Features:

Ends w/o brazing rings installed

Properties:

Body Material

Bronze

Body Style

Straight thru

Stem Material

Nickel copper alloy

Furnished Items

Union nut and tailpiece

Media For Which Designed

Water, fresh and water, salt

First End Connection Type

Unthreaded internal tube

First End Style Designator

Socket w/brazing ring

First End Outside Diameter Tube Accommodated

1.000 inches

Second End Relationship With First End

Identical

Seat Material

Rubber

Packing Material

Any acceptable

Flow Control Device

Diaphragm

Flow Control Device Material

Rubber

End Connection Quantity

Renewable Seat Ring Type

Threaded

Outlet Pressure Range

+25.0/+60.0 pounds per square inch

Outlet Pressure Range

+25.0 to 60.0 pounds per square inch

Regulation Type

Automatic double stage

Valve Stem Design

Single seat

Valve Loading Method

Spring

Maximum Inlet Pressure Rating

150.0 pounds per square inch

Outlet Pressure Accuracy Rating

Not rated

Filter

Not included

Filter

Not includednot included

Tempurature Rating

165.0 degrees fahrenheit

Tempurature Rating

165.0 degrees fahrenheit 165.0 degrees fahrenheit

Special Test Features

High-impact shock tests are required as directed in paragraphs 3.6 and 4.4.2.3 of mil-v-2042 in pac test above

Test Data Document

81349-milv2042 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.).

Nondefinitive Specification/std Data

2 type

NSN

4820-00-181-8911

Part Number

N551

Description

Valve,regulating,fluid Pressure

CAGE

35795

A valve designed to automatically maintain within close limits a predetermined outlet pressure which may be adjustable within a specified range regardless of the higher fluctuating or constant inlet pressure. It is designed for use with compressed gas(es) and various liquids and may include gauges. It may be inline or cartridge (manifold) design. Excludes regulator, pressure, medical gas administration apparatus; regulator, oxygen, barometric continuous flow; regulator, oxygen demand; regulator, oxygen diluter demand; and valve(1), fluid pressure regulating, aircraft.

Part N551 NSN 4820-00-181-8911

INC

FIIG

Concept No.

App. Key

Cond. Code

Status

INC:

27565

FIIG:

A21100

Concept No.:

App. Key:

Cond. Code:

Status:

Material Classification

Hazardous material, precious metals, criticality, enviroment, and electrostatic discharge indicators

HMIC

PMIC

ESD/EMI

ENAC

MMAC

CRITL

HMIC:

PMIC:

ESD:

MMAC:

CRITL:

Packaging & Shipping

Est. Pack Size

Est. Pack Weight

Est. Item Weight

Est. Item Dim.

Pack Size:

Paclk Weight:

30.6000lbs

Item Weight:

Item Dim:

OPI

SPI No.

SPI Rev.

SPC Mkg.

LVL A

LVL B

OPI:

SPI No.:

SPI Rev.:

SPC Mkg:

LVL_A:

LVL_B:

Freight Classification

NMFC

UFC

LTL

LCL

WCC

TCC

SHC

ACC

NMFC:

128000

UFC:

64870

LTL:

85.0

LCL:

WCC:

594

TCC:

SHC:

ACC:

Trailers/Vehicles

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Schedule B and Export

Schedule B: 8481809015
SITC: 74780
End Use: Industrial machines, other
NAICS: 332911
USDA: 1

Freight Class: Regulator valves, self-operating, for controlling variables such as temperature, pressure, flow and liquid level