SUN HYDRAULICS
SQHBQBN

***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 SQHBQBN (SQHBQBN) is a kickdown sequence valve designed to open completely and maintain an unrestricted flow path from port 1 to port 2 once the pressure at the inlet port 1 exceeds the valve setting. This mechanism is relative to the drain port 3, and the valve remains open as long as the pressure at port 1 surpasses that at port 2. To reset, pressure at port 1 must drop below the valve setting, and flow from port 1 to port 2 must stop with equal or greater pressure at port 2 compared to port 1. The sequence cartridges are interchangeable in terms of flow path and cavity for a given frame size, though they are not recommended for load holding applications. The main stage orifice is safeguarded by a 150-micron stainless steel screen. The pressure at port 3 adds directly to the valve setting in a 1:1 ratio and should not exceed 5000 psi (350 bar). This valve is intended for use on the actuator side of systems since flow must cease for resetting; if used on the pump side, pump flow must be halted for reset. It features Sun's floating style construction, which minimizes internal parts binding due to excessive installation torque or machining variations. The SQHBQBN can handle up to a capacity of 60 gpm (240 L/min) with a factory pressure setting established at kickdown point and maximum operating pressure of 5000 psi (350 bar). It has a typical response time of 25 ms and minimal leakage rate under specified conditions. Installation requires specific torque settings for optimal performance, including a valve hex size of 1\u00bc inches (31.8 mm) and locknut torque between 80-90 lbf\u00b7in (9-10 Nm).