Sun Hydraulics Threaded Cartridge Counterbalance Valve
Product Overview
Sun Hydraulics Threaded Cartridge Counterbalance Valve is a precision pilot‑assisted Hydraulic valve, belonging to the standard CARTRIDGE VALVE series designed for load holding and motion control in mobile and industrial hydraulic system. This specialized Hydraulic valve prevents overrunning loads, avoids uncontrolled falling or drifting of actuators, and ensures stable and safe operation of construction and industrial Machine. Adopting a threaded cartridge structure, it can be directly installed into custom‑machined cavities of hydraulic blocks or actuator housings, simplifying pipeline layout and improving the rigidity of the hydraulic system. Integrated with a free‑flow check valve and pilot‑controlled relief function, it delivers reliable load locking, speed regulation and overload protection performance. It is widely applied for aftermarket replacement, system upgrading and OEM matching of excavators, aerial work platforms, lifting equipment and other heavy‑duty Machine. The working stability of this CARTRIDGE VALVE directly affects the safety and operation smoothness of the entire hydraulic system.
Technical Specifications
- Brand: Sun Hydraulics
- Product Type: Pilot‑assisted threaded cartridge counterbalance Hydraulic valve, standard CARTRIDGE VALVE for load‑holding hydraulic system
- Maximum working pressure: Up to 350 bar
- Flow capacity: Matched with standard Sun cartridge cavity sizes
- Pilot ratio: Multiple optional pilot ratios for flexible pressure setting
- Check valve cracking pressure: Optional 0.3bar / 1.7bar to prevent actuator cavitation
- Installation: Threaded cartridge mounting, compliant with ISO 7368 standard cavity
- Working medium: Anti‑wear hydraulic oil for mobile and industrial hydraulic system
- Operating temperature: -20℃ ~ +85℃
- Feature: Positive sealing between all ports, adjustable pressure setting, excellent interchangeability, anti‑shock design, compact structure, perfectly adapts to harsh working conditions of engineering Machine
Working Principle
When hydraulic oil flows from the directional valve port to the load actuator, the built‑in check valve of this Hydraulic valve opens freely, allowing unobstructed oil supply to lift or move the load. When the load tends to run away under gravity, the check valve closes automatically. The pilot pressure signal from port 3 pushes the relief spool to open proportionally, establishing controllable backpressure on the return oil side to balance the load weight and realize stable speed control. The pressure setting of the CARTRIDGE VALVE is recommended to be at least 1.3 times the maximum load pressure to guarantee reliable load holding. When the Hydraulic valve is worn or stuck, the Machine will suffer faults such as load drifting, uncontrolled descending speed and hydraulic impact. Replacing a qualified Sun counterbalance cartridge valve can restore the stable load control performance of the hydraulic system.
Core Advantages
1. Authentic Sun Hydraulics cartridge design, threaded installation greatly reduces assembly space, optimizes the pipeline arrangement of the hydraulic system, and lowers maintenance difficulty of Machine.
2. Integrated pilot‑assisted relief and check valve composite structure, realizes load locking, stable speed regulation and overload protection in one CARTRIDGE VALVE, improving the safety of the hydraulic system.
3. Precise pressure adjustment design, clockwise rotation reduces pressure setting, easy to calibrate according to actual load conditions of Machine.
4. Floating valve tail structure compensates for machining tolerances, avoids spool jamming, and strong anti‑pollution performance adapts to dusty construction site environments, extending service life of the Hydraulic valve.
5. Standardized cavity size, interchangeable with other Sun series cartridge valves, convenient for system transformation and spare‑parts replacement.
Application Range
Sun Hydraulics Threaded Cartridge Counterbalance Hydraulic valve is a key load‑control component for open‑loop and closed‑loop hydraulic system. It is widely used in the slewing circuit, arm cylinder circuit, lifting mechanism of construction Machine, as well as hydraulic presses, injection molding machines, aerial work vehicles and other industrial equipment. It is supplied for hydraulic system integrators, machinery repair workshops, OEM manufacturers and global aftermarket spare‑parts trading business.
