Pilot-operated, balanced-poppet relief cartridges are normally closed pressure regulating valves. When the pressure at the inlet (port 1) reaches the valve setting, the valve starts to open to tank (port 2), throttling flow to regulate the pressure. These valves are accurate, smooth, quiet, fast, and have low pressure rise vs. flow.

• Because the modulating occurs inside the cartridge, these valves are immune to most of the problems associated with cavitation, namely noise and manifold erosion.
• Will accept maximum pressure at port 2; suitable for use in cross port relief circuits.
• Valve is relatively insensitive to varying oil temperatures and oil borne contamination.
• Main stage orifice is protected by a 150-micron stainless steel screen.