Model: 521B20

Fluid Pressure Regulating Valve

Properties:

Body Material

Brass

Body Style

Angle

Furnished Items

Inlet pressure gage and outlet pressure gage

First End Connection Type

Threaded internal pipe

First End Style Designator

Plain

First End Thread Size And Series/type Designator

0.250-18 npt

First End Thread Direction

Right-hand

Second End Relationship With First End

Identical

Seat Material

Polyamide nylon

Packing Material

Rubber, buna-n

Flow Control Device

Diaphragm

Flow Control Device Material

Rubber, synthetic

End Connection Quantity

Outlet Pressure Range

+25.0 to 4000.0 pounds per square inch

Regulation Type

Manual single stage

Manual Control Method

Knob

Valve Stem Design

Single seat

Valve Loading Method

Bellows

Maximum Inlet Pressure Rating

4500.0 pounds per square inch

Filter

Not included

Tempurature Rating

Between -65.0 degrees fahrenheit and 165.0 degrees fahrenheit

NSN

4820-00-457-6536

Part Number

521B20

Description

Valve,regulating,fluid Pressure

CAGE

28968

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 521B20 NSN 4820-00-457-6536

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:

0.1000lbs

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:

127220

UFC:

64490

LTL:

77.5

LCL:

WCC:

594

TCC:

SHC:

ACC:

Construction Materials

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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