77C

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Federal Supply Group

Valves

Federal Supply Classification

4820 Nonpowered Valves

National Stock Number

4820-01-499-5988

Item Name Code

05488

Assigment Date

07/30/2002 (24 years ago)

A nut, flat on top and bottom having 6 flat sides. For items which have internal tapered or straight (parallel) pipe threads, specific electrical conduit size designation, and which when installed, provide a method of tightening to lock the connection, see locknut, electrical conduit. See also locknut, tube fitting. For items having a thickness (or height) exceeding two times the width across the flats, use post, electrical-mechanical equipment. (when height or thickness and/or width across the flats is designated as a tolerance dimension, the maximum dimension will be used to determine compliance.)

centrifugal compressor end item identification, inside spring bonnet type, threaded bonnet attachment method, piston flow control device, spring disk loading method

Product Characteristics

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

Flow Control Device: piston
Bonnet Type: inside spring
Bonnet Attachment Method: threaded
Disk Loading Method: spring
End Item Identification: centrifugal compressor
Connection Style: flare(tube) all ends
Valve Operation Method: automatic
Connection Type: threaded internal pipe all ends
Adjustable Pressure Range: +30.0 to 100.0 pounds per square inch
Maximum Operating Pressure: 100.0 pounds per square inch single response
Special Features: dresser rand purchases this valve (pc 82) and spring (pc 81, p/n 407s-ws) from fulflo and assembles and sets cracking pressure at their factory. dresser rand refused to specify cracking pressure setting. similar item is 4820-01-259-8850 which uses the same spring and is set at 55 psi.
Material: steel overall
Media For Which Designed: liquid 2nd response
Media For Which Designed: oil 1st response
Style Designator: angle

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
00077C	Safety Relief Valve
077C	Safety Relief Valve
453036R2	Safety Relief Valve
77C	Safety Relief Valve
PL12498531	Safety Relief Valve
PL12498531 PC NO 82	Safety Relief Valve

FAQs

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

What is the FSCG of the NSN 4820-01-499-5988?

The FSCG of the NSN 4820-01-499-5988 is 4820

Does the NSN 4820-01-499-5988 have a Schedule B code assigned?

Yes, the Schedule B code is 8481400000

Does NSN 4820-01-499-5988 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 4820-01-499-5988 contain precious materials?

Item does not contain precious metal.

Does NSN 4820-01-499-5988 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 4820-01-499-5988 was assigned to the Federal Catalog?

It was assigned 24 years ago, on Tue, Jul 30, 2002