Core Functions and Typical Applications of Hydraulic Valves

Hydraulic valves are automated components operated by pressurized oil. They control the pressure, flow rate, and direction of the fluid to open and close pipeline systems. They are typically used in combination with solenoid valves to remotely control the clamping, control, and lubrication of oil, gas, and water pipeline systems in hydropower stations. Today, Jianlong Hydraulic Technology will briefly share the following:

1. Core Functions of Hydraulic Valves

Simply put, hydraulic valves are components used to control and regulate the direction, pressure, and flow rate of fluid in a hydraulic system.

1.1 Controlling the Direction of Fluid Flow: For example, controlling the extension and retraction of a hydraulic cylinder, or the forward and reverse rotation of a hydraulic motor. This is achieved through directional control valves (such as directional control valves).

1.2 Regulating or Limiting Pressure: Preventing excessive system pressure, protecting hydraulic components from damage; or setting a specific working pressure for a branch of the system. This is achieved through pressure control valves (such as relief valves and pressure reducing valves).

1.3 Flow Regulation: Controlling the flow rate of hydraulic fluid into the actuators (hydraulic cylinders or hydraulic motors) to control their speed. This is achieved through flow control valves (such as throttle valves and speed control valves).

2. Typical Application Scenarios

2.1 Construction Machinery (Excavators, Loaders, Cranes)

2.1.1 Multi-way Directional Control Valve Assembly: This is the core control unit of construction machinery, integrating multiple directional valves, relief valves, check valves, etc., used to control the complex movements of all actuators.

2.1.2 Balance Valve/Overload Valve: Used to control the smooth movement of components such as booms and buckets, preventing "nodding" or loss of control due to sudden load loss or external forces.

2.1.3 Pilot Control: The operator controls the main directional valve through a low-power pilot valve (manual or electronic), making operation easier and more precise.

2.2 Metalworking Machine Tools (Injection Molding Machines, Die Casting Machines, Hydraulic Punch Presses)

2.2.1 Electro-hydraulic Proportional Valves/Servo Valves: Used to achieve high-precision pressure, flow, and position control, ensuring smooth, accurate, and repeatable processing.

2.2.2 Sequential Loops: Enable automated work cycles such as "rapid advance - working advance - pressure holding - rapid retraction".

2.2.3 Pressure Reducing Valves: Provide stable low-pressure oil for various auxiliary actions (such as clamping and ejection).

2.3 Aerospace

Electro-hydraulic Servo Valves: Require extremely high response speed, precision, and reliability, used to control critical systems such as aircraft control surfaces, landing gear retraction and extension, and engine nozzles.

2.4 Agricultural Machinery (Tractors, Combine Harvesters)

2.4.1 Directional Control Valves: Control the raising and lowering of agricultural implements (such as plows and harvesting platforms).

2.4.2 Flow Control Valves: Regulate the speed of hydraulic motors to drive traveling or working parts.

2.5 Automotive Industry

2.5.1 Power Steering System: The rotary valve controls the direction and flow of hydraulic fluid in the power steering cylinder based on the steering wheel angle.

2.5.2 Automatic Transmission: A series of precision hydraulic valves control the engagement and disengagement of the clutch and brakes to achieve gear shifting.

Hydraulic valves are the core of hydraulic technology. Through precise control of fluid direction, pressure, and flow, they efficiently, reliably, and controllably transmit the fluid energy generated by the hydraulic pump to the actuators, ultimately driving various mechanical equipment to complete complex tasks. From excavators we see every day to high-precision aircraft and machine tools, all rely on the precise control of hydraulic valves. For more information/advice on hydraulic valves or to purchase other high-quality hydraulic presses, please contact us (or scan the WhatsApp QR code below). Jianlong Hydraulic Technology will provide you with personalized and customized professional solutions and is dedicated to serving you.