GUARDIAN® DEFENDER RESET RELIEF VALVE, P/N MV-88000

Marathon Valve’s high-pressure Guardian® valve line has multiple patents and has been engineered to be the field-proven “work horse” in the industry.  Marathon Valve has successfully designed out all the fundamental flaws of existing reset relief valves on the market today allowing for consistent long-term use in the field most drillers require from their equipment.  The enhanced service life, consistent ease of operation, and close to zero free maintenance has made these safety valves the valve of choice for installations on mud pumps.

  • Adjustable operating working pressure range, 2000 – 10,000 PSI
  • Ability to manually release pressure
  • In the closed position, all surfaces in contact with drilling mud and high pressure are stainless-steel and titanium
  • Temperature rating -20° F to 250°F (-28°C to 121°C), Temperature class P, U
  • 3” safety relief valve with industry standard connectors to faciliate change outs with existing relief valves
  • Flanged standard with 3” 1502 male/female or 3” SCH XXH butt-weld connections
  • API 6A specifications on all pressure containing parts
  • NACE MR-0175 specifications, PSL 3
  • Standard and H2S service
  • U.S. Patent number: 9,371,927
  • U.S. Patent number: 9,395,008
  • U.S. Patent number: 9,739,385
  • Forged steel valve body and connectors, API 6A specifications
  • Safety valve protecting pumps from high pressure by automatically opening when the pre-determined set pressure is reached
  • Release button located on the bonnet for visual indication of the valve being open or closed
  • Valve can be manually opened to relieve pressure
  • PSI settings can be increased while under pressure
  • Simplified maintenance
  • Trigger mechanism allows for consistent, repeatable operation
  • Titanium Seal Guard® automatically covers the lower piston seal from the drilling mud and high pressures when the valve opens to relieve pressure
  • Only reset relief valve in the industry with the patented stainless-steel valve body insert for excellent corrosion resistance
  • Energized seals ensure proper sealing at high pressures
  • Engineered to prevent seal blowout and eliminate wash-out