Masoneilan 172 Series

The Masoneilan 172 series are spring loaded direct-operated, pressure reducing regulators. Their main function is to regulate the outlet pressure. They are available in ½” to 2” (DN15 through DN50) body sizes and can be supplied with a wide range of different end connections. The “bolted” flanged design provides flexibility to meet custom face to face dimensions as required, simplifying replacement of existing units. These regulators have a compact design and durable construction to withstand harsh conditions while being easy to install and to maintain.

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General features:

  • Flow to open design
  • 9 to 14 different Cv ratings for each size to assure high accuracy of regulation
  • Metal or Sot Seat constructions
  • Internal pressure sensing (external on request)
  • Different face to face dimensions available
  • Wide range of actuator sizes according to the requested regulation range
  • Elastomeric or metal (316 st. st.) for fluid and application compatibility
  • Fully sealed construction available (suitable for dangerous medium; ATEX compliant)
  • Balanced construction available for high pressure drops


General Data


Pressure Reducing


Steam, Gas, Liquids


½” to 2” (DN15-DN50)


      Ratings & Connections

Screwed:  NPT ½” through 2” (CN15-DN50)

Flanged:  ASME CL150-CL600

High Pressure CL900/1500 Inlet available


Carbon Steel, Stainless Steel, Other Alloys


Plug Type : Disc

Seat : Integral

Material : Stainless Steel (std.), others on request

Capacity : Cv ratings from 0.031 up to 12.8

Diaphragm Materials

Polychloroprene, EPDM, FKM, Stainless Steel