Hydraulic Counter Check Valve

I. Product Type and Basic Specifications
This product is a hydraulic pilot-operated check valve (cone-type pressure retention valve), a directional control cartridge component for power units, categorized as a solenoid valve. It is a genuine FLYING BULL brand product, sourced 100% new and supplied directly from the original manufacturer. Designed for use with oil as the medium, it serves as a key control component in construction machinery hydraulic systems. It meets the procurement needs of wholesalers for hydraulic system maintenance, part replacement, and power unit assembly.

II. Operating Pressure
The valve operates under standard pressure conditions, matching the typical pressure ranges of most construction machinery hydraulic systems. It can be installed and used directly without requiring additional pressure adaptation or modification. This simplifies installation for customers and ensures reliable pressure retention and directional control in the hydraulic system.

III. Function Testing and Adjustment
Function Testing: Regular testing of the valve is recommended. By adjusting system pressure and observing the valve's response, you can verify that it opens and closes correctly at the set pressure, thereby maintaining safe hydraulic system operation.
Setting Adjustment: If the relief valve setting needs to be adjusted to meet system requirements, use appropriate professional tools and equipment. This ensures accuracy and reliability of the adjusted setting and helps prevent system malfunctions due to incorrect adjustment.

IV. Hydraulic Oil Replacement Requirements
Hydraulic oil quality directly affects valve performance and overall hydraulic system operation. Low-quality oil can lead to valve blockage or leakage. Regular oil changes are essential, and the new oil must fully comply with system specifications. Wholesalers should emphasize this point when providing maintenance guidance to customers, helping to reduce after-sales issues related to oil quality.

V. Maintenance Guidelines

Always refer to the equipment operation manual and manufacturer's guidelines during maintenance to ensure correct and effective procedures.

Before performing any maintenance, shut down the equipment and disconnect the power supply to eliminate safety risks.

If a problem cannot be resolved independently, contact qualified technical personnel promptly to avoid further equipment damage.

 

 

Frequently Asked Questions (FAQ)

1. What requirements should be followed when changing hydraulic oil for systems using this valve?
Poor‑quality hydraulic oil can cause valve blockages and leaks. Therefore:

Regularly replace the hydraulic oil.

Ensure the new oil meets the system's specifications – this is critical for maintaining the valve's normal operation and extending its service life. You can use this as a key maintenance guideline to share with your customers.

2. What safety precautions should be taken during the maintenance of this valve?
Three key precautions apply:

Follow the equipment operation manual and manufacturer's requirements to ensure correct and effective maintenance.

Before maintenance/repair, shut down the equipment and disconnect the power supply to eliminate safety hazards.

For unsolvable problems, contact professional technicians promptly to avoid further equipment damage.

3. What is the warranty period for this valve, and what does it cover?
The 100% brand‑new product comes with a 1‑year warranty. The warranty covers manufacturing defects that affect normal operation, such as valve leakage due to substandard craftsmanship or pressure‑holding failure caused by faulty internal components. If such issues occur within the warranty period, we provide replacement or technical support.

4. What is the standard delivery time for bulk orders, and is expedited delivery available?
The standard delivery cycle for bulk orders is 5‑7 working days. For urgent needs (e.g., emergency maintenance of your customers' loaders or construction machinery), please contact our 24‑hour sales team. We will adjust production and logistics schedules to provide customized expedited solutions.

5. As a wholesaler, can we get factory‑direct pricing, and is there flexibility in MOQ? Does customization service exist?

Pricing and MOQ – We offer factory‑outlet pricing exclusively for wholesalers to ensure your market competitiveness. MOQ terms are flexible, based on your long‑term cooperation plans (e.g., annual procurement volume for construction machinery parts) and immediate order demands – consult our sales team for details.

Customization – Yes, we provide customization to adapt to specific construction machinery (e.g., Doosan equipment, loaders) or power unit requirements. Share your customers' detailed needs (e.g., target machinery model, system specifications) with our team for a tailored plan.

6. How does a pilot‑operated check valve differ from a standard check valve?
A standard check valve allows free flow in one direction and blocks flow in the reverse direction. A pilot‑operated check valve (like this product) can be opened in the reverse direction by applying pilot pressure. This allows controlled lowering of a load while still providing leak‑free load holding when the pilot pressure is removed – essential for crane booms, excavator arms, and hydraulic presses.

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