SUN HYDRAULICS
SQDBFDN
$93.12 USD
- SUN HYDRAULICS
- Material:SQDBFDN
- Model:SQDB-FDN
- 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 SQDBFDN (SQDBFDN) is a kickdown sequence valve designed to fully open and maintain an open state once the pressure at inlet port 1 surpasses the valve's setting, thereby allowing unrestricted flow from port 1 to port 2. This valve remains open as long as the pressure at port 1 exceeds that at port 2, and resets only when pressure conditions change such that flow ceases and pressures equalize or reverse. This product is not recommended for load holding applications due to its operational design. The main stage orifice is safeguarded by a durable 150-micron stainless steel screen, ensuring longevity and reliability in various applications. Pressure at drain port 3 directly influences the valve setting and should not exceed 5000 psi (350 bar). The SQDBFDN is primarily intended for use on the actuator side of hydraulic systems, requiring cessation of flow for resetting; if applied on the pump side, pump flow must halt for reset functionality. It features corrosion-resistant construction options with suffixes AP or LH denoting external stainless steel or zinc-nickel plating respectively. The valve incorporates Sun\u2019s floating style construction to reduce potential internal binding due to installation torque or machining variations. It fits into a T-11A cavity with a capacity of 15 gpm (60 L/min) and operates efficiently with a typical response time of 25 ms. Maximum operating pressure reaches up to 5000 psi (350 bar), and it exhibits minimal leakage rates under specified conditions. The adjustment mechanism allows for five clockwise turns to increase settings, with specific torque requirements provided for installation and adjustment components.
The Sun Hydraulics SQDBFDN (SQDBFDN) is a kickdown sequence valve designed to fully open and maintain an open state once the pressure at inlet port 1 surpasses the valve's setting, thereby allowing unrestricted flow from port 1 to port 2. This valve remains open as long as the pressure at port 1 exceeds that at port 2, and resets only when pressure conditions change such that flow ceases and pressures equalize or reverse. This product is not recommended for load holding applications due to its operational design. The main stage orifice is safeguarded by a durable 150-micron stainless steel screen, ensuring longevity and reliability in various applications. Pressure at drain port 3 directly influences the valve setting and should not exceed 5000 psi (350 bar). The SQDBFDN is primarily intended for use on the actuator side of hydraulic systems, requiring cessation of flow for resetting; if applied on the pump side, pump flow must halt for reset functionality. It features corrosion-resistant construction options with suffixes AP or LH denoting external stainless steel or zinc-nickel plating respectively. The valve incorporates Sun\u2019s floating style construction to reduce potential internal binding due to installation torque or machining variations. It fits into a T-11A cavity with a capacity of 15 gpm (60 L/min) and operates efficiently with a typical response time of 25 ms. Maximum operating pressure reaches up to 5000 psi (350 bar), and it exhibits minimal leakage rates under specified conditions. The adjustment mechanism allows for five clockwise turns to increase settings, with specific torque requirements provided for installation and adjustment components.
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 |
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
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.