SUN HYDRAULICS
SQHBQEN

***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 SQHBQEN (SQHBQEN) is a sophisticated kickdown sequence valve designed for hydraulic systems requiring precise pressure control. This valve kicks completely open and maintains an open state once the inlet port 1 pressure surpasses the preset threshold, enabling unrestricted flow from port 1 to port 2. It remains open as long as the pressure at port 1 exceeds that at port 2. To reset, the pressure at port 1 must fall below the valve setting, flow must stop from port 1 to port 2, and pressure at port 2 must match or exceed that of port 1. The SQHBQEN is interchangeable with other three-port sequence cartridges of the same frame size, offering consistent flow paths and cavity compatibility. Notably, this valve should not be used in load-holding applications. It features a main stage orifice shielded by a robust 150-micron stainless steel screen and can handle pressures up to a maximum of 5000 psi (350 bar) at port 3, which directly influences the valve setting in a one-to-one ratio. The design incorporates Sun's floating style construction to reduce internal binding risks due to installation torque or machining variations. The SQHBQEN is optimized for actuator-side usage in hydraulic systems where flow cessation is necessary for valve resetting; if applied on the pump side, pump flow must be halted for reset functionality. Its technical specifications include a capacity of up to 60 gpm (240 L/min), response time typically around 25 ms, and minimal leakage rates under standard conditions. The factory settings are established at kickdown points with adjustments possible via clockwise turns on its adjustment screw.