SUN HYDRAULICS
SQDBFQN
$93.80 USD
Tags:
- SUN HYDRAULICS
- Material:SQDBFQN
- Model:SQDB-FQN
- 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 SQDBFQN (SQDBFQN) is a kickdown sequence valve designed to facilitate an unrestricted flow path from port 1 to port 2 once the pressure at the inlet port exceeds the valve's setting. This valve is particularly suitable for applications where maintaining an open flow path is essential after a certain pressure threshold is surpassed. The pressure setting at port 1 is relative to the drain port 3, and the valve will remain open as long as the pressure at port 1 exceeds that at port 2. To reset, pressure must drop below the set point, and flow must cease with equal or greater pressure at port 2 compared to port 1. The cartridge design allows for physical and functional interchangeability across similar frame sizes, offering flexibility in system integration. Notably, this sequence valve should not be used for load-holding applications due to its design characteristics. It features a main stage orifice protected by a 150-micron stainless steel screen and can handle pressures up to 5000 psi (350 bar) at port 3. These valves are optimized for use on the actuator side of hydraulic systems; if implemented on the pump side, pump flow must be stopped for resetting purposes. The corrosion-resistant construction options include external stainless steel or zinc-nickel plated components, enhancing durability in harsh environments. The SQDBFQN incorporates Sun's floating style construction to prevent internal part binding caused by installation torque or machining variations. It has a capacity of up to 15 gpm (60 L/min) and operates with a typical response time of 25 ms. The valve has specific installation requirements including torque settings and adjustment features, ensuring precise control in demanding hydraulic applications.
The Sun Hydraulics SQDBFQN (SQDBFQN) is a kickdown sequence valve designed to facilitate an unrestricted flow path from port 1 to port 2 once the pressure at the inlet port exceeds the valve's setting. This valve is particularly suitable for applications where maintaining an open flow path is essential after a certain pressure threshold is surpassed. The pressure setting at port 1 is relative to the drain port 3, and the valve will remain open as long as the pressure at port 1 exceeds that at port 2. To reset, pressure must drop below the set point, and flow must cease with equal or greater pressure at port 2 compared to port 1. The cartridge design allows for physical and functional interchangeability across similar frame sizes, offering flexibility in system integration. Notably, this sequence valve should not be used for load-holding applications due to its design characteristics. It features a main stage orifice protected by a 150-micron stainless steel screen and can handle pressures up to 5000 psi (350 bar) at port 3. These valves are optimized for use on the actuator side of hydraulic systems; if implemented on the pump side, pump flow must be stopped for resetting purposes. The corrosion-resistant construction options include external stainless steel or zinc-nickel plated components, enhancing durability in harsh environments. The SQDBFQN incorporates Sun's floating style construction to prevent internal part binding caused by installation torque or machining variations. It has a capacity of up to 15 gpm (60 L/min) and operates with a typical response time of 25 ms. The valve has specific installation requirements including torque settings and adjustment features, ensuring precise control in demanding hydraulic applications.
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.