SUN HYDRAULICS
SQFBCDN

***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 SQFBCDN (SQFBCDN) is a kickdown sequence valve designed to open completely and maintain an open state once the inlet port 1 pressure surpasses the preset valve threshold, facilitating an unrestricted flow from port 1 to port 2. The pressure at port 1 is compared relative to the drain port 3, with the valve remaining open as long as the inlet pressure exceeds that at port 2. To reset, the pressure at port 1 must drop below its set point, flow from port 1 to port 2 must stop, and pressure at port 2 should be equal to or greater than that at port 1. This valve is physically and functionally interchangeable with all other three-port sequence cartridges of the same frame size but is not suitable for load-holding applications. The main stage orifice is safeguarded by a stainless steel screen rated at 150 microns. The additive effect of pressure at port 3 on the valve setting is direct and should not exceed a maximum of 5000 psi (350 bar). Designed for actuator-side use, it requires cessation of flow through the valve for resetting; if implemented on a pump side, pump flow must be halted for reset functionality. It employs Sun's floating style construction to reduce internal binding risks due to installation torque or machining variances. With a capacity of up to 30 gpm (120 L/min) and factory pressure settings established at kickdown points, it operates under a maximum pressure of 5000 psi (350 bar) with typical response times around 25 ms. The unit features minimal leakage rates and includes detailed specifications for installation torque and adjustment capabilities.