SUN HYDRAULICS
SQDBKDN
$109.01 USD
- SUN HYDRAULICS
- Material:SQDBKDN
- Model:SQDB-KDN
- 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 SQDBKDN (SQDBKDN) is a kickdown sequence valve designed for hydraulic systems where the valve needs to remain open once a set pressure is exceeded at the inlet port. This model allows for an unrestricted flow path from port 1 to port 2, provided that the pressure at port 1 surpasses that of port 2. The valve will reset only when the pressure at port 1 drops below the set threshold, and flow between ports ceases, with pressure conditions balanced or favoring port 2. Notably, this valve should not be used in load holding applications due to its design characteristics. The SQDBKDN features a main stage orifice protected by a 150-micron stainless steel screen and can operate under pressures up to 5000 psi (350 bar). It incorporates Sun's floating style construction, which reduces the risk of internal component binding due to installation torque variations or machining discrepancies. The valve's response time is typically around 25 milliseconds, with minimal leakage rates. This model is physically and functionally interchangeable with other three-port sequence cartridges of similar frame sizes, sharing identical flow paths and cavity specifications. It's intended for use on the actuator side of hydraulic systems since flow must halt for resetting purposes; if implemented on the pump side, pump flow must also stop for reset functionality. For environments prone to corrosion, Sun offers options such as external stainless steel components (model code suffix AP) or zinc-nickel plated components (suffix LH). The product includes detailed specifications like adjustment settings, hex sizes for installation and adjustment screws, locknut torque requirements, and compatibility with Viton seal kits.
The Sun Hydraulics SQDBKDN (SQDBKDN) is a kickdown sequence valve designed for hydraulic systems where the valve needs to remain open once a set pressure is exceeded at the inlet port. This model allows for an unrestricted flow path from port 1 to port 2, provided that the pressure at port 1 surpasses that of port 2. The valve will reset only when the pressure at port 1 drops below the set threshold, and flow between ports ceases, with pressure conditions balanced or favoring port 2. Notably, this valve should not be used in load holding applications due to its design characteristics. The SQDBKDN features a main stage orifice protected by a 150-micron stainless steel screen and can operate under pressures up to 5000 psi (350 bar). It incorporates Sun's floating style construction, which reduces the risk of internal component binding due to installation torque variations or machining discrepancies. The valve's response time is typically around 25 milliseconds, with minimal leakage rates. This model is physically and functionally interchangeable with other three-port sequence cartridges of similar frame sizes, sharing identical flow paths and cavity specifications. It's intended for use on the actuator side of hydraulic systems since flow must halt for resetting purposes; if implemented on the pump side, pump flow must also stop for reset functionality. For environments prone to corrosion, Sun offers options such as external stainless steel components (model code suffix AP) or zinc-nickel plated components (suffix LH). The product includes detailed specifications like adjustment settings, hex sizes for installation and adjustment screws, locknut torque requirements, and compatibility with Viton seal kits.
Kick-down sequence valves will kick completely open and remain open once the pressure at the inlet (port 1) exceeds the valve setting, creating an unrestricted flow path from port 1 to port 2 (sequence). The pressure setting at port 1 is relative to the drain (port 3). The valve remains open as long as the pressure at port 1 exceeds the pressure at port 2. To reset the valve, pressure at port 1 must fall below the setting of the valve, flow from port 1 to port 2 must cease, and pressure at port 2 must be equal to or greater than the pressure at port 1.
- All 3 port sequence cartridges are physically and functionally interchangeable (i.e. same flow path, same cavity for a given frame size).
- Should not be used in load holding applications.
- The main stage orifice is protected by a 150 micron stainless steel screen.
- Pressure at port 3 is directly additive to the valve setting at a 1:1 ratio and should not exceed 5000 psi (350 bar).
- Intended for use on the actuator side of the system as flow through the valve must cease for the valve to reset. If used on the pump side of a system, pump flow must be shut off for the valve to reset.
- Corrosion resistant cartridge valves are intended for use in corrosive environments and are identified by the model code suffix /AP for external stainless steel components, or /LH for external zinc-nickel plated components. See the CONFIGURATION section for all options. For further details, please see the Materials of Construction page located under TECH RESOURCES.
- 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-11A |
| Series | 1 |
| Capacity | 15 gpm60 L/min. |
| Factory Pressure Settings Established at | Kick down pointKick down point |
| Maximum Operating Pressure | 5000 psi350 bar |
| Response Time - Typical | 25 ms25 ms |
| Maximum Valve Leakage at 110 SUS (24 cSt) | 2 in³/min.30 cc/min. |
| Adjustment - Number of Clockwise Turns to Increase Setting | 55 |
| Valve Hex Size | 7/8 in.22,2 mm |
| Valve Installation Torque | 30 - 35 lbf ft41 - 47 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 |
| Model Weight | .40 lb0,20 kg |
| Seal kit - Cartridge | Viton: 990-011-006 |
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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
Notes:
- For Series 1 cartridges configured with an O control (panel mount handknob), a .75 in. (19 mm) diameter hole is required in the panel.