Mark 6127 Series

Piloted, Liquid Pressure Regulating Valves


Piloted, Liquid Pressure Regulating Valves

The Mark 6127 pressure-reducing valve is used in many applications worldwide. The primary function of the Mark 6127 is to reduce a greater upstream pressure to a lesser, more manageable downstream pressure, and operate without regard to either upstream supply or downstream demand. The valve is easily maintained without removal from the line.

Features & Benefits

  • Reduces higher inlet pressure to a constant lower outlet pressure
  • Outlet pressure is accurate over wide range of flow
  • Pilot-operated main valve is not subject to pressure fall off characteristic of direct-acting PRV’s
  • Outlet pressure is adjustable over complete range of control spring


  • Sizes: 1-1/4″ – 24″
  • Body Material: Ductile Iron, Cast Steel, Cast Bronze, Stainless Steel
  • End Connection: Flanged (#150, #300), Screwed, Grooved End
  • Diaphragm: Buna-N, Viton, EPDM
  • Max Inlet Pressure: 740 psi (51 bar)