PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

18-402Valve,safety Relief

Pottstown Water Heater Co Inc · NSN 4820-01-323-2977 · FSC 4820 · No Item Name Available
Verified by PartsTable
NSN 4820-01-323-2977 — this item is cataloged by the U.S. Government under National Stock Number 4820-01-323-2977. Primary manufacturer part number: 18-402.
Features
  • Valve,safety Relief — FSC 4820
  • Maximum Operating Temp: 210.0 FAHRENHEIT SINGLE RESPONSE DEGF
  • Opening Pressure Setting: 150.0 POUNDS PER SQUARE INCH LBS
  • 1 verified cross-reference
  • Primary manufacturer: Pottstown Water Heater Co Inc
Applications
  • Flow control in piping systems
  • Pressure regulation
  • Steam and fluid isolation
General Description

The Valve,safety Relief, cataloged under National Stock Number 4820-01-323-2977, is classified within Federal Supply Class 4820 (No Item Name Available) of the Valves group. The primary manufacturer of record is Pottstown Water Heater Co Inc. Government technical data includes 2 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 1 commercial cross-reference from 1 manufacturer, enabling identification through both NSN and commercial part number lookups. 9 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN4820-01-323-2977
Primary Part Number18-402
Item NameValve,safety Relief
FSC / FSG4820 / 48 — No Item Name Available
ManufacturerPottstown Water Heater Co Inc
StatusACTIVE
Maximum Operating Temp210.0 FAHRENHEIT SINGLE RESPONSE DEGF
Opening Pressure Setting150.0 POUNDS PER SQUARE INCH LBS
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 9
6145-00-103-195218402 INTERCHANGEABLE
Cable,special Purpose,electrical
Belden Wire and Cable Co Wire and Cable Office
5305-00-167-411718402 INTERCHANGEABLE
Screw,machine
Pratt & Whitney Canada Corp Div Pratt & Whitney Canada Corp.
6110-00-243-16461840-2 INTERCHANGEABLE
Protector,thermal-Overload,elect
Schneider Metal Mfg Co Inc
5342-00-574-8269 INTERCHANGEABLE
Clip,brake
5945-00-657-4681 INTERCHANGEABLE
Relay,electromagnetic
3510-01-312-102018402 INTERCHANGEABLE
Agitator,washing Machine
Whirlpool Corp Dba Whirlpool Corp
6685-01-332-296318402 INTERCHANGEABLE
Thermostat,flow Control
Henny Penny Corporation
6510-01-587-3214DYNJ05156LF INTERCHANGEABLE
Bandage,elastic
Medline Industries, Lp
5935-01-645-7977 INTERCHANGEABLE
Dvi HDMI Feml Adapt
Cross-Reference Index
Part NumberManufacturer
18-402 Pottstown Water Heater Co Inc (USA)
Related Parts
6145-00-103-1952INTERCHANGEABLE
CABLE,SPECIAL PURPOSE,ELECTRICAL
18402
5305-00-167-4117INTERCHANGEABLE
SCREW,MACHINE
18402
6110-00-243-1646INTERCHANGEABLE
PROTECTOR,THERMAL-OVERLOAD,ELECT
1840-2
5342-00-574-8269INTERCHANGEABLE
CLIP,BRAKE
5945-00-657-4681INTERCHANGEABLE
RELAY,ELECTROMAGNETIC
3510-01-312-1020INTERCHANGEABLE
AGITATOR,WASHING MACHINE
18402
6685-01-332-2963INTERCHANGEABLE
THERMOSTAT,FLOW CONTROL
18402
6510-01-587-3214INTERCHANGEABLE
BANDAGE,ELASTIC
DYNJ05156LF
5935-01-645-7977INTERCHANGEABLE
DVI HDMI FEML ADAPT

Frequently Asked Questions

What is NSN 4820-01-323-2977?

NSN 4820-01-323-2977 is a Valve,safety Relief, manufactured by Pottstown Water Heater Co Inc, classified under FSC 4820 (No Item Name Available). Status: active.

What are the part numbers for NSN 4820-01-323-2977?

NSN 4820-01-323-2977 has 1 cross-referenced part number: 18-402 (Pottstown Water Heater Co Inc).

What NSN replaces 4820-01-323-2977?

There are 9 known substitutes for 4820-01-323-2977: 6145-00-103-1952, 5305-00-167-4117, 6110-00-243-1646 and 6 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 18-402?

Key specifications for 18-402: Maximum Operating Temp: 210.0 FAHRENHEIT SINGLE RESPONSE DEGF; Opening Pressure Setting: 150.0 POUNDS PER SQUARE INCH LBS. 2 total characteristics are documented in the Federal Logistics Information System.

Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
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