SUN HYDRAULICS
SQFBKBN

***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 SQFBKBN (SQFBKBN) is a precision-engineered kickdown sequence valve designed for hydraulic systems where maintaining open flow is critical once a specific pressure threshold is surpassed. This valve kicks completely open when the pressure at inlet port 1 exceeds its preset value, ensuring an unrestricted flow path from port 1 to port 2. It remains open as long as the inlet pressure is higher than the outlet pressure, resetting only when these conditions are reversed and flow ceases. The valve's design allows for interchangeability among all 3-port sequence cartridges of similar frame sizes, providing versatility in various applications without concern for physical or functional incompatibility. Incorporating Sun's floating style construction, the SQFBKBN minimizes internal binding risks due to installation torque or machining variations. The main stage orifice is safeguarded by a robust 150-micron stainless steel screen, and the device should not be employed in load-holding scenarios. The valve's maximum operating pressure reaches up to 5000 psi (350 bar), with response times typically around 25 milliseconds. It features a factory-set kickdown point and can handle a capacity of up to 30 gpm (120 L/min). Installation specifics include a valve hex size of 1-1/8 inches (28.6 mm) and an installation torque range between 45-50 lbf ft (61-68 Nm). Adjustments are made via an internal hex screw with five clockwise turns increasing the setting, while a locknut ensures secure positioning with a torque requirement of 80-90 lbf in (9-10 Nm). Weighing approximately .50 lb (.25 kg), this model also includes Viton seals for enhanced durability under rigorous conditions.