Pressure Relief Valves for Installation into Metal

IMH Insert Pressure Relief Valves are threadless, cartridge-style valves designed for simple, low-cost installation into manifolds, in the most compact package available anywhere.

A high quality, metal-to-metal seat provides long life and extremely low leakage, as well as compatibility with a wide range of fluids.

Insert Pressure Relief Valves are available in forward and reverse flow directions in two sizes: 5.5mm diameter and an 8.0mm diameter size for more flow.

Lee Pressure Relief Valve Features and Benefits

Metal to metal seating
  • Provides high reliability.
  • Long life
  • Repeatable crack
Leak tight
  • Efficient system performance
Guided ball design
  • Fast response
  • Low hysteresis
100% tested
  • Eliminates rework


5.5mm Diameter Models
558 Reverse Pressure Relief Valves
558 Forward Pressure Relief Valves
8.0mm Diameter Models
855 Reverse Pressure Relief Valves
855 Forward Pressure Relief Valves



The Lee Company, Industrial Microhydraulics Group • 82 Pequot Park Road, Westbrook, CT 06498-0424 • Tel: 860-399-6281 • Fax: 860-399-7037 •
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