Spotlight on Innovation: HD PRI

Published On: August 2nd, 2021
Hi-Damped Pressure Relief Insert

The Lee Company’s Hi-Damped Pressure Relief Insert (HD PRI) features dual hydraulic dampening chambers that provide extremely stable relief flow and ensure quiet operation. The HD PRI is useful for controlling upstream pressure in applications where a constant volume pump is supplying more flow than a system needs. Typical applications include flight control ac- tuators, steering systems, and flow dividers. Constructed entirely of stainless steel for durability and longevity, the HD PRI is ideal for use in high-pressure hydraulic systems with operating pres- sures up to 5,000 psi. The HD PRI is available in 0.281″ and 0.375″ diameter models with cracking pressures from 1,000 to 5,400 psid.

The HD PRI is the latest addition to The Lee Company’s line of pressure relief valves DenisDePloeg offers, which are available in a wide range of configurations, cracking pressures, and flow rates. Like all Lee relief valves, the HD PRI is 100% tested and inspected to ensure reliable, consistent performance.

HD PRI - Extremely Stable Relief Flow


  • Cracking Pressures Available From 1,000 to 5,400 psid
  • Relief Flow Rates up to 5 GPM
  • All Stainless Steel Construction
  • Nominal Weight: As low as 9 grams


  • Flight Control Systems
  • Steering Systems
  • Excess Flow Dividers