PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

31P-VAIValve,linear,directional Control

Humphrey Products Co · NSN 4820-01-500-3128 · FSC 4820 · No Item Name Available
Verified by PartsTable
NSN 4820-01-500-3128 — this item is cataloged by the U.S. Government under National Stock Number 4820-01-500-3128. Primary manufacturer part number: 31P-VAI.
Features
  • Valve,linear,directional Control — FSC 4820
  • Maximum Operating Temp and Media for Which Designed: 180.0 FAHRENHEIT AIR DEGF
  • Spool Quantity: 1
  • Spool Position Quantity: 2
  • Flow Pattern Quantity: 3
  • End Connection Quantity: 3
  • Valve Operation Method: MANUAL
  • Furnished Items and Quantity: 1 KNOB
Applications
  • Flow control in piping systems
  • Pressure regulation
  • Steam and fluid isolation
General Description

The Valve,linear,directional Control, cataloged under National Stock Number 4820-01-500-3128, is classified within Federal Supply Class 4820 (No Item Name Available) of the Valves group. The primary manufacturer of record is Humphrey Products Co. Government technical data includes 8 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 2 commercial cross-references from 2 manufacturers, enabling identification through both NSN and commercial part number lookups. 12 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN4820-01-500-3128
Primary Part Number31P-VAI
Item NameValve,linear,directional Control
FSC / FSG4820 / 48 — No Item Name Available
ManufacturerHumphrey Products Co
StatusACTIVE
Maximum Operating Temp and Media for Which Designed180.0 FAHRENHEIT AIR DEGF
Spool Quantity1
Spool Position Quantity2
Flow Pattern Quantity3
End Connection Quantity3
Valve Operation MethodMANUAL
Furnished Items and Quantity1 KNOB
Connection TypeTHREADED INTERNAL PIPE
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 12
5365-00-006-0944200016 INTERCHANGEABLE
Spacer,sleeve
Eaton Corporation Dba Airframe Div Fuel & Motion Control Systems
5365-00-087-7125200016 INTERCHANGEABLE
Plug,machine Thread
Woodward Hrt Inc
6810-00-118-2673 INTERCHANGEABLE
Chlorophenol Red Solution
3110-00-156-3427200-016 INTERCHANGEABLE
Bearing,ball,annular
Cummins-Allison Corp. Dba Cummins-Allison Div Federal Government Department
5962-00-403-45307475DC INTERCHANGEABLE
Microcircuit,digital
Fairchild Semiconductor Corp
5950-00-789-8568 INTERCHANGEABLE
Transformer,power
6515-01-267-1492200.016 INTERCHANGEABLE
Screw,bone
Depuy Synthes Sales Inc Dba Depuy Synthes Trauma Div Depuy Synthes Sales, Inc., D/b/a Depuy Synthes Trauma
5340-01-423-03212-00016 INTERCHANGEABLE
Grille,metal
Trinity Tool Co Div Trinco Trinity Tool Company
6220-01-513-7246200016 INTERCHANGEABLE
Light,marker,clearance
Betts Industries, Inc.
4940-01-516-802120-0016 INTERCHANGEABLE
Regulator Air Swive
Tri-State Precision, Inc.
Cross-Reference Index
Part NumberManufacturer
200016 S & G Enterprises Inc (USA)
31P-VAI PRIMARY Humphrey Products Co (USA)
Related Parts
5365-00-006-0944INTERCHANGEABLE
SPACER,SLEEVE
200016
5365-00-087-7125INTERCHANGEABLE
PLUG,MACHINE THREAD
200016
6810-00-118-2673INTERCHANGEABLE
CHLOROPHENOL RED SOLUTION
3110-00-156-3427INTERCHANGEABLE
BEARING,BALL,ANNULAR
200-016
5962-00-403-4530INTERCHANGEABLE
MICROCIRCUIT,DIGITAL
7475DC
5950-00-789-8568INTERCHANGEABLE
TRANSFORMER,POWER
6515-01-267-1492INTERCHANGEABLE
SCREW,BONE
200.016
5340-01-423-0321INTERCHANGEABLE
GRILLE,METAL
2-00016
6220-01-513-7246INTERCHANGEABLE
LIGHT,MARKER,CLEARANCE
200016
4940-01-516-8021INTERCHANGEABLE
REGULATOR AIR SWIVE
20-0016
5930-01-609-9659INTERCHANGEABLE
SWITCH,PRESSURE
20-0016
4030-01-615-6669INTERCHANGEABLE
PANNIER ASSEMBLY
200016

Frequently Asked Questions

What is NSN 4820-01-500-3128?

NSN 4820-01-500-3128 is a Valve,linear,directional Control, manufactured by Humphrey Products Co, classified under FSC 4820 (No Item Name Available). Status: active.

What are the part numbers for NSN 4820-01-500-3128?

NSN 4820-01-500-3128 has 2 cross-referenced part numbers: 200016 (S & G Enterprises Inc), 31P-VAI (Humphrey Products Co).

What NSN replaces 4820-01-500-3128?

There are 12 known substitutes for 4820-01-500-3128: 5365-00-006-0944, 5365-00-087-7125, 6810-00-118-2673 and 9 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 31P-VAI?

Key specifications for 31P-VAI: Maximum Operating Temp and Media for Which Designed: 180.0 FAHRENHEIT AIR DEGF; Special Features: SPRING RETURN TYPE,3-WAY NORMALLY CLOSED/NORMALLY OPEN VALVE DIVERTOR OR DUAL-PRESSURE,2-WAY VA;VE W/PLUGGED NC OR NO PORT PLUGGED,PANEL MOUNTED W/2 NO.10 SCREWS,1.31 INCH H X 1.25 INCH W X0.63 IN D,WEIGHT 4.25 OZ. OZ; Spool Quantity: 1; Spool Position Quantity: 2. 9 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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