The Sun Hydraulics RDDT and RDFT pressure relief valves are CE/TÜV certified in accordance with the Pressure Equipment Directive 97/23/EC (PED). The cartridges meet Category IV of the PED, providing the highest level of system protection, being produced to stringent product assurance requirements. Sun Hydraulics is also certified for modules B and D of the PED, allowing the company to self-certify products. Typical applications include protection
from pressure transients of hydraulic accumulators, pressure vessels and piping used on fluid power systems that must comply with the PED.
When the pressure at the inlet (port 1) reaches the valve setting, the valve starts to open to tank (port 2), throttling flow to limit the pressure rise. Valve capacity can be determined from the performance curve. This shows an approved flow which depends on the excess operating pressure. As a requirement of the PED, the system pressure at the maximum approved flow is a maximum of 10% above the excess operating pressure.
The RDDT and RDFT are direct acting poppet valves and are available in two sizes. When used with T-10A and T-3A cavities, they are interchangeable with other Sun pressure relief valves and can be used to replace and upgrade them if required. The compact, standard cartridge design incorporates Sun’s floating style construction. These valves are smooth and quiet, with essentially zero leakage. They are also dirt tolerant, immune to silting and are very fast. They are fully approved for use within systems that must comply with the PED.
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