204-251

View detailed technical data, stock status, and sourcing information for: 204-251

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204-251
Federal Supply Group
Valves
Federal Supply Classification
4820 Nonpowered Valves
National Stock Number
4820-00-287-4355
Item Name Code
05493
Assigment Date
01/01/1961 (65 years ago)

A self-acting valve specifically designed for use in refrigeration systems for continual control of rate of flow of refrigerant. It may be actuated by a thermostatic element or self-actuated.

"angle give "adqm" and "adqn" if flanged one or two ends" body style, 0.250 inches nominal first end outside diameter tube accommodated, flared first end style designator, refrigerant 12 media for which designed, threaded external tube first end connection type

Product Characteristics

Below you’ll find the complete technical specifications and performance data for this part, including material details and compliance information.

Body Style
"angle give "adqm" and "adqn" if flanged one or two ends"
Media For Which Designed
refrigerant 12
First End Connection Type
threaded external tube
First End Style Designator
flared
First End Outside Diameter Tube Accommodated
0.250 inches nominal
First End Thread Class
3a
First End Thread Direction
right-hand
Second End Relationship With First End
not identical
Second End Connection Type
threaded internal pipe
Second End Style Designator
plain
Second End Nominal Pipe Size Accommodated
0.250 inches
Second End Thread Direction
right-hand
First End Seat Angle In Deg
45.0
Flow Control Device
ball
End Connection Quantity
2
Valve Expansion Control Type
pressure
Valve Pressure Limiting Device
not included
Valve Equalizer Location
internal
Refrigeration Capacity In Btu Per Hour
4.0
Special Features
15 in. vacuum to 35 psi adjustable range
Material
copper alloy body
Material
steel corrosion resisting flow control device
Material
steel corrosion resisting seat

Related Parts

This NSN group includes multiple components designed to meet specific performance and operational standards. Each listing provides detailed specs, functionality data, and replacement compatibility information:

Part Number Name
204-251 Expansion Valve
204CA50600 Expansion Valve
P1692 Expansion Valve

FAQs

Find helpful answers about installation, operation, maintenance, compliance, and troubleshooting.

What is the FSCG of the NSN 4820-00-287-4355?
The FSCG of the NSN 4820-00-287-4355 is 4820
Does the NSN 4820-00-287-4355 have a Schedule B code assigned?
Yes, the Schedule B code is 8481809050
Does NSN 4820-00-287-4355 require demilitarization?
Items subject to the export administration regulations (ear) in parts 730-774 of title 15, code of federal regulations (cfr) (ccli or ear99) and determined by dod to present a low risk when released out of dod control. No demil, mut, or end use certificate is required. May require an export licensefrom doc.
Does NSN 4820-00-287-4355 contain precious materials?
Item does not contain precious metal.
Does NSN 4820-00-287-4355 contain hazardous materials?
Indicates there is no data in the hmirs and the nsn is in a fsc not generally suspected of containing hazardous materials.
When the NSN 4820-00-287-4355 was assigned to the Federal Catalog?
It was assigned 65 years ago, on Sun, Jan 1, 1961

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