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Pressure relief valve insert for critical flow applications

23 March 2020

The Lee Company introduces a new Hi-Damped Pressure Relief Valve Insert – providing a solution for situations where high or spiking pressure is prevalent.

Finding an effective solution for controlling high upstream hydraulic pressure in applications, where a constant volume pump is supplying more flow than the system requires, can be a challenge. 

Examples of critical flow systems where excess flows can be a serious problem include flight controls, steering systems, and flow dividers in aerospace, aviation, F1 motorsport and oil exploration applications. 

Standard relief valves are likely to suffer from issues such as instability, erosion and structural damage and all these undesirable effects have consequences in terms of maintenance and repair – not to mention cost and, potentially, safety.  These are the issues which led the designers at the Lee Company to make dual hydraulic dampening chambers a central feature of the new 375 HD PRI. These chambers ensure extremely stable relief flow over various flow rates and pressure combinations, with the added benefit of quiet operation.

Durability and longevity are likely to be key in some of the application environments so constructing the inserts entirely with stainless steel meets these requirements, while a rugged 440C Poppet and Seat ensure optimum durability. They are available in forward and reverse relief flow directions and offer a range of cracking pressures for 3000, 4000 and 5000 psi systems, with system peak pressures up to 6750 psi. 

Set inside a compact footprint to meet the demands of precision micro-hydraulic systems, the HDI PR is available in 7.14mm and 9.53mm diameter options, with a nominal weight as low as 9g, up to a maximum of 21g. 

Like all Lee’s valves, the HD PRI is 100% endurance tested to a minimum of 100,000 cycles and inspected to ensure reliable and consistent performance. 


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Maxon Group UK