SUN HYDRAULICS
SDHTLWV

***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 SDHTLWV (SDHTLWV) is a pilot-operated, anti-shock relief 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 the adjust screw determining both the maximum relief setting and minimum threshold setting. An external drain makes the valve insensitive to pressure at port 2. The internal modulation within the cartridge makes these valves immune to cavitation issues such as noise and manifold erosion. As pilot flow increases with rising pressure at port 1 relative to port 3 drain, the valve setting adjusts accordingly. It's important to note that this valve is not suitable for sequencing cylinders or load-holding applications. Pressure at port 3 adds directly to the valve setting in a 1:1 ratio without exceeding 5000 psi (350 bar), while being insensitive to back pressure at port 2. It can handle maximum pressure at port 2, making it suitable for use in cross-port relief circuits and relatively insensitive to varying oil temperatures and contamination. The main stage orifice is protected against contamination, incorporating Sun's floating style construction which minimizes binding due to excessive installation torque or machining variations. The valve features a cavity T-17A, series 3, with a capacity of up to 60 gpm (240 L/min) and a maximum operating pressure of 5000 psi (350 bar). Typical response time is about 2 ms with a pressure ramp-up time between 300-500 ms. The adjustment involves up to five clockwise turns for setting increases, with specific torque requirements for installation and locknut adjustments. The model weighs approximately 1.50 lb (0.70 kg) and utilizes Viton seal kits for optimal performance.