Model: 5-664-8

Safety Relief Valve

Properties:

Thread Class

3a all ends

Thread Direction

Right-hand all ends

Flow Control Device

Poppet

Disk Loading Method

Spring

Maximum Operating Temp

165.0 degrees fahrenheit single response

Connection Style

G42 flared (tube) all ends

Valve Operation Method

Automatic

Connection Type

Threaded external tube all ends

Features Provided

Pressure tight outlet side

Thready Qty Per Inch (tpi)

20 all ends

Adjustable Pressure Range

+40.0/+125.0 pounds per square inch

Thread Size

0.437 inches all ends

Seat Angle

37.0 degrees all ends

Opening Pressure Setting

90.0 pounds per square inch

Outside Diameter Tube Accommodated

0.250 inches all ends

Material

Aluminum alloy 2014 and aluminum alloy

Material Specification

Qq-a-200/2, alloy2014, t4 federal specification 1st material response and qq-a-225/4, alloy 2014, t4 federal specification 2nd material response or qq-a-367, comp 2014, t4 federal specification 3rd material response

Surface Treatment

Anodize

Surface Treatment Specification

Mil-a-8625, type 1 military specification single treatment response

Thread Series Designator

Unf all ends

NSN

4820-00-880-0421

Part Number

5-664-8

Description

Valve,safety Relief

CAGE

86768

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 5-664-8 NSN 4820-00-880-0421

INC

FIIG

Concept No.

App. Key

Cond. Code

Status

INC:

05488

FIIG:

A046B0

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:

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

Pricing & Availability Check

Submit this form for stock availability and pricing.

How to Order

Ordering from buyaircraftparts.com

If you would like to order this safety relief valve (NSN 4820-00-880-0421) please submit the pricing and availability form above to receive an up to date quote by email. If you agree to the pricing and terms you can e-sign your order online!

We are pleased to have the opportunity to serve you.

Have a Question

Hours:	08:00-18:00 Eastern Standard Time
Phone:	+1 470-231-0824
Email:	Contact Form »

Schedule B and Export

Schedule B: 8481400000
SITC: 74740
End Use: Industrial machines, other
NAICS: 332911
USDA: 1

Freight Class: Safety or relief valves