Model: SV08-2NCP/SV08-B20/SV08-20-M	Media: Oil
Warranty: 1 YEAR	Condition: New, 100% Brand-new
Place of Origin: Zhejiang, China	Power: Hydraulic
Brand Name: FLYING BULL	Quality: High-Quality
Delivery: 5-7 Working Days	Pressure: Ordinary Pressure

 

Hydraulic Threaded Cartridge valve is a multifunctional composite valve with the basic components of cartridge valve (spool, sleeve, spring and seal ring) inserted into a specially designed and processed valve body, and equipped with a cover plate and pilot valve. Because each cartridge valve basic component has and only two oil ports, it is called a two-way cartridge valve, and in the early days, it is also called a logic valve.

 

 

The two-way cartridge valve has the following characteristics: large flow capacity, small pressure loss, suitable for large flow hydraulic system; The main spool stroke is short, the action is sensitive, the response is fast, the impact is small; Strong anti-oil ability, no strict requirements for oil filtration accuracy; Simple structure, easy maintenance, less failure, long life; The plug-in has the characteristics of one valve and multiple energies, which is convenient to form various hydraulic circuits and work stably and reliably; The plug-in has a high degree of universality, standardization, serialization of parts, can form an integrated system.

 

 

The two-way cartridge valve consists of a cartridge element, a control cover plate, a pilot control element and a cartridge block.

 

 

Fan drives controlled by hydraulic cartridge valves are quieter and run on less horsepower than mechanical fan drives, providing greater fuel economy for excavators. Control valves with multiple temperature inputs can be used to provide variable fan speed control depending on air temperature, load, and cooling requirements. If the radiator gets clogged, two-position, four-way solenoid valves can automatically reverse fan direction. Electronic control of the hydraulic cooling system can be achieved using either an EFDR1 programmable valve driver or a CoreTek controller (ECU).

 

 

Frequently Asked Questions (FAQ)

1. What is a hydraulic threaded cartridge valve?
A hydraulic threaded cartridge valve is a screw-in valve that fits into a machined cavity in a manifold block. It consists of basic components – spool, sleeve, spring, and seal rings – inserted into a valve body, then equipped with a cover plate and pilot valve. Because each unit has exactly two oil ports, it is called a two-way cartridge valve or logic valve.

2. What are the main advantages of two-way cartridge valves?
Key advantages include: large flow capacity with low pressure loss, short spool stroke for fast response and low impact, good contamination tolerance, simple structure with easy maintenance, one valve can perform multiple functions (pressure, directional, flow, check), and high standardization across manufacturers using common cavities.

3. What are the components of a two-way cartridge valve?
A two-way cartridge valve consists of four main parts: the cartridge element (spool, sleeve, spring), the control cover plate (contains pilot orifices), the pilot control element (small solenoid valve or pressure control), and the cartridge block (manifold with machined cavities and internal passages).

4. How is a cartridge valve different from a traditional stack valve?
A stack valve mounts on top of a subplate with pipes between valves. A cartridge valve screws directly into a manifold block. Internal passages within the manifold connect valves together. Cartridge valves are more compact, have fewer external leak points, are easier to replace, and offer faster response due to short internal flow paths.

5. How are cartridge valves used in excavator cooling fan systems?
Hydraulic cartridge valves control variable-speed fan drives. Unlike mechanical fans that run at engine speed constantly, hydraulic fans run only as fast as needed based on coolant temperature, hydraulic oil temperature, and charge air temperature. If the radiator clogs, a two-position, four-way solenoid valve reverses fan direction to blow debris out. Electronic control uses a programmable driver or ECU.

6. What models of hydraulic threaded cartridge valves does Flying Bull offer?
Flying Bull offers models SV08-2NCP, SV08-B20, and SV08-20-M. These are standard cavity cartridge valves for ordinary pressure hydraulic systems using oil media. All models are 100% brand new with a 1‑year warranty. Delivery takes 5–7 working days.

7. What is meant by "logic valve" for a two-way cartridge valve?
Early cartridge valves were called "logic valves" because they perform basic logical functions: AND (pressure at both ports to open), OR (pressure at either port to open), and NOT (pressure at pilot to close). By combining logic valves with pilot controls, you can create complex hydraulic circuits without custom-machined spools.

8. Does the hydraulic threaded cartridge valve come with a warranty?
Yes. Flying Bull provides a 1‑year warranty against manufacturing defects. Damage caused by contaminated fluid, incorrect installation, overpressure, or voltage issues is not covered. Always use clean hydraulic oil and maintain recommended filtration.

 

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