SUN HYDRAULICS
SQFBFCN
$137.01 USD
- SUN HYDRAULICS
- Material:SQFBFCN
- Model:SQFB-FCN
- 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 SQFBFCN (SQFBFCN) is a kickdown sequence valve designed to open fully and maintain an unrestricted flow path from port 1 to port 2 once the inlet pressure exceeds the valve setting. This mechanism is crucial for applications where maintaining a consistent flow is necessary after a certain pressure threshold is reached. The valve's setting at port 1 is relative to the drain at port 3, ensuring that it remains open as long as the pressure at port 1 surpasses that at port 2. To reset, the pressure must drop below the valve's setting, with no flow between ports 1 and 2, and equal or greater pressure at port 2 compared to port 1. The SQFBFCN features a main stage orifice protected by a stainless steel screen and should not be used in load holding scenarios. It incorporates Sun's floating style construction to prevent internal binding due to installation torque or machining variations. This sequence valve is interchangeable with other three-port sequence cartridges of the same frame size, offering versatility in different system configurations. With a maximum operating pressure of up to 5000 psi (350 bar) and a capacity of handling flows up to 30 gpm (120 L/min), it provides reliable performance for various hydraulic systems. The factory pressure settings are established at the kickdown point, with typical response times around 25 ms and minimal leakage rates. Installation requires specific torque settings for both the valve and locknut, ensuring secure assembly. Additionally, it comes with an internal hex adjustment screw for ease of setting adjustments. The compact design weighs only .50 lb (.25 kg) and includes Viton seal kits for enhanced durability in demanding environments.
The Sun Hydraulics SQFBFCN (SQFBFCN) is a kickdown sequence valve designed to open fully and maintain an unrestricted flow path from port 1 to port 2 once the inlet pressure exceeds the valve setting. This mechanism is crucial for applications where maintaining a consistent flow is necessary after a certain pressure threshold is reached. The valve's setting at port 1 is relative to the drain at port 3, ensuring that it remains open as long as the pressure at port 1 surpasses that at port 2. To reset, the pressure must drop below the valve's setting, with no flow between ports 1 and 2, and equal or greater pressure at port 2 compared to port 1. The SQFBFCN features a main stage orifice protected by a stainless steel screen and should not be used in load holding scenarios. It incorporates Sun's floating style construction to prevent internal binding due to installation torque or machining variations. This sequence valve is interchangeable with other three-port sequence cartridges of the same frame size, offering versatility in different system configurations. With a maximum operating pressure of up to 5000 psi (350 bar) and a capacity of handling flows up to 30 gpm (120 L/min), it provides reliable performance for various hydraulic systems. The factory pressure settings are established at the kickdown point, with typical response times around 25 ms and minimal leakage rates. Installation requires specific torque settings for both the valve and locknut, ensuring secure assembly. Additionally, it comes with an internal hex adjustment screw for ease of setting adjustments. The compact design weighs only .50 lb (.25 kg) and includes Viton seal kits for enhanced durability in demanding environments.
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.
- 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 | 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) | 3 in³/min.50 cc/min. |
| Adjustment - Number of Clockwise Turns to Increase Setting | 55 |
| 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 |
| Model Weight | .50 lb0,25 kg |
| Seal kit - Cartridge | Viton: 990-202-006 |
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Additional Resources
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- 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.