What is Double Pilot Check Valve？

February 01, 2024

1. Introduction to the development and evolution of Double Pilot Check Valve
Double Pilot Check Valve is an important component used to control the flow direction of fluid in hydraulic systems. Its principle is to use a combination of two one-way valves to achieve free flow in one direction and blockage in the other direction. The valve cannot be opened until a driving pressure proportional to the load is felt. This valve design effectively maintains the position of the hydraulic cylinder and prevents slippage when the directional control valve is in the neutral position.

The development history of Double Pilot Check Valve can be traced back to the early 20th century, when people began to use hydraulic systems to drive mechanical equipment, such as excavators, cranes, forklifts, etc. In order to solve the stability and safety problems of hydraulic cylinders, people have designed various forms of one-way valves, such as spring type, ball type, cone type, etc. However, these one-way valves have certain defects, such as easy leakage, easy blockage, slow response, etc. In order to overcome these shortcomings, people began to research and develop Double Pilot Check Valve in the mid-20th century, using driving pressure to control the opening and closing of the one-way valve, improving the performance and reliability of the valve.

The application scope of Double Pilot Check Valve has also been expanding with the development of hydraulic technology. In addition to being used to maintain the hydraulic cylinder, it can also be used to implement the 5/3 channel function, that is, when all ports are blocked, The movement of pneumatic or electric actuators is controlled through the combination of two 3/2-channel valves. In addition, Double Pilot Check Valve can also be used for safety protection of hydraulic systems, such as preventing overload, preventing backflow, preventing impact, etc.

2. Basic knowledge
Double Pilot Check Valve is a combination that utilizes two one-way valves to allow free flow in one direction and blockage in the other direction. The valve cannot be opened until pilot pressure proportional to the load is felt. hydraulic components.

3. Advantages of the product
Compared with ordinary one-way valves, the Double Pilot Check Valve has the following advantages:

The response speed is fast. The opening and closing of the valve is controlled by the driving pressure and is not affected by the flow rate and viscosity, allowing rapid switching.

The sealing performance is good. The sealing surface of the valve is made of metal or rubber material, which has good wear resistance and self-cleaning properties, and can effectively prevent leakage.

With compact structure, the valve is small in size, light in weight and easy to install. It can be used alone or in combination with other valves.

It has various functions. The valve can be used to maintain the hydraulic cylinder, can also be used to realize the 5/3 channel function, and can also be used for the safety protection of the hydraulic system.

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4. Maintenance and maintenance
The maintenance and upkeep of Double Pilot Check Valve mainly includes the following aspects:

Regularly check the working status of the valve, and if there is any abnormality, troubleshoot in time.
Clean the inside of the valve regularly to remove impurities and dirt and keep the valve clean.
Regularly replace valve seals to prevent aging and damage and maintain the valve's sealing performance.
Regularly lubricate the moving parts of the valve to reduce friction and wear and maintain valve flexibility.
Avoid valve overload and impact, and prevent valve deformation and damage.

5. Application areas
Double Pilot Check Valve has a wide range of applications, mainly including the following aspects:

Mechanical equipment, such as excavators, cranes, forklifts, etc., are used to control the movement and position of hydraulic cylinders to improve the stability and safety of the equipment.
Pneumatic or electric actuators, such as cylinders, motors, etc., are used to implement 5/3 channel functions, control the forward, reverse, and stop of the actuator, and improve the efficiency and accuracy of the actuator.

Hydraulic systems, such as hydraulic pumps, hydraulic valves, etc., are used for safety protection of the hydraulic system, preventing overload, backflow, impact, etc., and improving the reliability and life of the hydraulic system.

6. Summary
Double Pilot Check Valve is a combination that utilizes two one-way valves to allow free flow in one direction and blockage in the other direction. The valve cannot be opened until pilot pressure proportional to the load is felt. hydraulic components. It has the advantages of fast response, good sealing performance, compact structure, and diverse functions. It is widely used in mechanical equipment, pneumatic or electric actuators, hydraulic systems and other fields, and is an important part of hydraulic technology.

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著者:

Ms. Sally Feng

Eメール:

shining@hywal.cn

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+8615152371681

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