SUN HYDRAULICS
RQCBLBN

***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 RQCBLBN (RQCBLBN) is a kickdown relief cartridge designed to function similarly to a circuit breaker in hydraulic systems. When the pressure at inlet port 1 exceeds the valve setting, the valve kicks completely open, creating an unrestricted flow path from port 1 to tank port 2. This state remains as long as the pressure at port 1 is greater than at port 2. To reset, flow through the cartridge must stop, and pressure at port 2 must be equal to or greater than at port 1. The main stage orifice is protected by a 150-micron stainless steel screen, ensuring durability and reliability under various conditions. Notably, this valve is not suitable for load-holding applications and should be used on the actuator side of a system since flow must cease for resetting. If applied on the pump side, pump flow must be stopped for reset. The back pressure on tank port 2 adds directly to the valve setting in a 1:1 ratio. This model incorporates Sun's floating style construction, minimizing internal part binding due to excessive installation torque or machining variations. It fits into Cavity T-162A with a series capacity of up to 12 gpm (45 L/min) and can handle maximum operating pressures of up to 5000 psi (350 bar). The response time is typically around 25 ms with minimal leakage rates at specified viscosities and pressures. Adjustments can be made by turning clockwise up to five times with specific installation torque requirements for optimal performance and safety.