SUN HYDRAULICS
SDFTLCN
$194.29 USD
- SUN HYDRAULICS
- Material:SDFTLCN
- Model:SDFT-LCN
- Summary:Cartridge
Quantity in stock: 0
***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 SDFTLCN (SDFTLCN) is a pilot-operated, anti-shock sequence cartridge valve designed to limit maximum system pressure and control the rate of pressure rise. It operates by opening and then ramping closed at a constant speed, independent of settings and flows. The valve features an adjustable screw that determines the maximum relief setting and minimum threshold setting, with an external drain making it insensitive to pressure at port 2. This design ensures immunity to cavitation-related issues such as noise and manifold erosion. The valve's pilot flow increases as the inlet pressure at port 1 rises above the valve setting relative to the drain pressure at port 3. It is not suitable for sequencing cylinders or load holding applications but can be used in cross port relief circuits due to its ability to handle maximum pressure at port 2. The SDFTLCN is relatively insensitive to varying oil temperatures and contamination, with a cavity T-2A series capacity of 30 gpm (120 L/min) and a factory pressure setting established at 4 gpm (15 L/min). It has a maximum operating pressure of 5000 psi (350 bar), a control pilot flow range of 10-25 in\u00b3/min (0.16-0.41 L/min), and typical response times of 2 ms with a pressure ramp-up time between 200-400 ms. Adjustment is achieved through clockwise turns, with four and a half turns required for increasing settings. The valve's hex size is 1-1/8 in (28.6 mm), with installation torque between 45-50 lbf\u00b7ft (61-68 Nm). Additional specifications include an internal hex size for adjustment screws of 5/32 in (4 mm) and locknut torque specifications between 80-90 lbf\u00b7in (9-10 Nm).
The Sun Hydraulics SDFTLCN (SDFTLCN) is a pilot-operated, anti-shock sequence cartridge valve designed to limit maximum system pressure and control the rate of pressure rise. It operates by opening and then ramping closed at a constant speed, independent of settings and flows. The valve features an adjustable screw that determines the maximum relief setting and minimum threshold setting, with an external drain making it insensitive to pressure at port 2. This design ensures immunity to cavitation-related issues such as noise and manifold erosion. The valve's pilot flow increases as the inlet pressure at port 1 rises above the valve setting relative to the drain pressure at port 3. It is not suitable for sequencing cylinders or load holding applications but can be used in cross port relief circuits due to its ability to handle maximum pressure at port 2. The SDFTLCN is relatively insensitive to varying oil temperatures and contamination, with a cavity T-2A series capacity of 30 gpm (120 L/min) and a factory pressure setting established at 4 gpm (15 L/min). It has a maximum operating pressure of 5000 psi (350 bar), a control pilot flow range of 10-25 in\u00b3/min (0.16-0.41 L/min), and typical response times of 2 ms with a pressure ramp-up time between 200-400 ms. Adjustment is achieved through clockwise turns, with four and a half turns required for increasing settings. The valve's hex size is 1-1/8 in (28.6 mm), with installation torque between 45-50 lbf\u00b7ft (61-68 Nm). Additional specifications include an internal hex size for adjustment screws of 5/32 in (4 mm) and locknut torque specifications between 80-90 lbf\u00b7in (9-10 Nm).
Pilot-operated, anti shock sequence cartridges limit maximum system pressure and also limit the rate of pressure rise. The valve opens and then ramps closed at a constant speed, independent of settings and flows. The adjust screw determines the maximum (relief) setting and the minimum (threshold) setting.The external drain makes the valve insensitive to pressure at port 2.
- Because the modulating occurs inside the cartridge, these valves are immune to most of the problems associated with cavitation, namely noise and manifold erosion.
- Pilot flow continues to increase as the pressure at port 1 (inlet), relative to the pressure at port 3 (drain), rises above the valve setting.
- Not suitable for sequncing cylinders.
- Pressure at port 3 is directly additive to the valve setting at a 1:1 ratio and should not exceed 5000 psi (350 bar).
- Pressure settings are insensitive to back pressure at port 2.
- 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.
- Not suitable for use in load holding applications.
- When pressure at the inlet (port 1) exceeds the threshold setting, the valve opens to tank (port 2). The pilot section moves forward at a steady rate, increasing the setting by compressing the pilot spring. Maximum setting is achieved when the pilot section reaches a mechanical stop.
- The main stage orifice is protected against contamination.
- Incorporates the Sun floating style construction to minimize the possibility of internal parts binding due to excessive installation torque and/or cavity/cartridge machining variations.
| Cavity | T-2A |
| Series | 2 |
| Capacity | 30 gpm120 L/min. |
| Factory Pressure Settings Established at | 4 gpm15 L/min. |
| Maximum Operating Pressure | 5000 psi350 bar |
| Control Pilot Flow | 10 - 25 in³/min.0,16 - 0,41 L/min. |
| Response Time - Typical | 2 ms2 ms |
| Pressure Ramp Up Time | 200 - 400 ms200 - 400 ms |
| Adjustment - Number of Clockwise Turns to Increase Setting | 4.54.5 |
| Valve Hex Size | 1 1/8 in.28,6 mm |
| Valve Installation Torque | 45 - 50 lbf ft61 - 68 Nm |
| Adjustment Screw Internal Hex Size | 5/32 in.4 mm |
| Locknut Hex Size | 9/16 in.15 mm |
| Locknut Torque | 80 - 90 lbf in.9 - 10 Nm |
| Seal kit - Cartridge | Viton: 990-402-006 |
Show FAQ
Additional Resources
- Sun Offers Zinc-Nickel Plating for Corrosion Resistance
- Sun Cartridges with EPDM Seals
- Sun Expands Corrosion-Resistant Solutions
- QuickDesign with SmartConnect Offers Drag-and-Drop Schematic Tool
- Series 4 PLUS Cartridges Offer Higher Flows with Lower Pressure Losses
- Sequence Valves Technical Tips
- Manufacturing Sun Cartridge Cavities
- Sequence Valves
- Sun Model Code Explanation; 999-901-334
- Cavity Information (S-171) and Tooling
- Cartridges: Materials of Construction
- Fluid and Temperature Recommendations
- Performance Data
- Sun's Floating Style Screw-In Cartridge
- Units of Measure, Settings, and Conversions