National Stock Number (NSN) 4820-01-118-1987, or NIIN 011181987, (valve,weighted control,piston) was assigned August 29, 1981 in the Federal Logistics Information System (FLIS). This NIIN is Available for Manual Assignment. This NSN does not replace any other NSNs.
There are 2 manufacturer part numbers associated with this NSN. One of those part number(s) are considered obsolete. The manufacturer part numbers were originally supplied by one supplier. Today, one supplier is listed as an Active supplier for this NSN. Of the active suppliers, only one supplier is deemed design controlled or valid supply parts.
This part number has not been procured by the US Government in over 5 years, with the most recent procurement date of Jul 31, 2017. There have been 2 contracts issued for this part number, with 2 awards given. There is minimal competition for this NSN. The US Government has awarded contracts to 2 different suppliers. The last contract numbers awarded were: SPE4A517V3910, SPE4A517V3910, SPE4A516M1245. The total value of the awarded contracts has been US$ 36,987.48.
There has been very little demand for this national stock number. The demand for this NSN originated from less than 5 countries. Based on a planned procurement review by the Primary Inventory Control Activity (PICA) on Jul 30, 2020, this NSN's acquisition method was noted as: Acquire directly from the actual manufacturer, whether or not the prime contractor is the actual manufacturer. The Government physically does not have in its possession sufficient, accurate, or legible data to purchase this part from other than current source(s). (NOTE: This code is applicable only to parts under immediate buy requirements and only as long as the deficiency is under review for resolution and appropriate recoding.) Valid AMCs: 1, 2, 3, 4 and 5.
This NSN is assigned to Item Name Code (INC) 16994. [A VALVE CONSISTING OF A PORTED, DEAD WEIGHTED, HOLLOW PISTON WHICH MOVES VERTICALLY ACROSS THE INLET PASSAGE WITHIN THE VALVE BODY. CHANGES IN THE PRESSURE CONTROLLED POSITION OF THE PISTON VARY THE EFFECTIVE AREA OF THE PORTS EXPOSED TO THE INLET FLOW IN SUCH A MANNER AS TO MAINTAIN A CONSTANT OUTLET LINE PRESSURE. IT HAS NO SEATS OR DISK. FOR DEAD WEIGHT LOADED PRESSURE REGULATING VALVE OF SEAT AND DISK CONSTRUCTION, SEE ALSO VALVE, REGULATING, FLUID PRESSURE.]. This item does not have a nuclear hardened feature or any other critical feature such as tolerance, fit restriction or application. There is no data in the HMIRS and the NSN is in an FSC not generally suspected of containing hazardous materials. NSN 4820011181987 does not contain precious metals.
This NSN is associated to Schedule B 8481809050: other taps, cocks, valves, etc., nesoi. The Schedule B End Use is listed as industrial machines, other. NAICS classification category 332911: industrial valve manufacturing.
This information was last updated on Aug 01, 2025.