SUN HYDRAULICS
SDFTLAN

***Disclaimer: The following summary contains information gathered from various sources such as product descriptions, technical specifications and catalogs. While efforts have been made to provide accurate details, inaccuracies may occur. It is advised to verify all information by contacting Sun Hydraulics directly.***
The Sun Hydraulics SDFTLAN (SDFTLAN) is a pilot-operated, anti-shock sequence cartridge designed to limit maximum system pressure and control the rate of pressure rise. This valve opens and ramps closed at a constant speed, independent of settings and flows, with an adjustable screw to determine the maximum relief and minimum threshold settings. It features an external drain that makes it insensitive to pressure at port 2, ensuring reliable performance in cross-port relief circuits. The valve's modulating action occurs inside the cartridge, making it immune to cavitation-related issues such as noise and manifold erosion. It is not suitable for sequencing cylinders or load-holding applications. Pressure at port 3 directly adds to the valve setting at a 1:1 ratio, but should not exceed 5000 psi (350 bar). The valve can accept maximum pressure at port 2 and remains relatively insensitive to varying oil temperatures and contamination. When inlet pressure at port 1 surpasses the threshold setting, the valve opens to tank port 2, with the pilot section moving forward steadily to increase the setting by compressing the pilot spring until a mechanical stop is reached. The main stage orifice is protected against contamination, featuring Sun's floating style construction to minimize internal binding due to excessive torque or machining variations. Key specifications include a flow capacity of 30 gpm (120 L/min), maximum operating pressure of 5000 psi (350 bar), control pilot flow between 10-25 in\u00b3/min (0.16-0.41 L/min), typical response time of 2 ms, and pressure ramp-up time between 200-400 ms. The adjustment requires approximately 4.5 clockwise turns to increase setting, with installation torque ranging from 45-50 lbf\u00b7ft (61-68 Nm).