Hydraulic ball valve is a common hydraulic control component widely used in various hydraulic systems. This article will summarize the relevant knowledge of hydraulic ball valves, including their structure, working principle, classification, selection, installation, and maintenance.

A、 Working principle of hydraulic ball valve

The working principle of hydraulic ball valve is to control the flow of liquid by rotating the ball. When the handle rotates, the valve stem drives the ball to rotate, thereby changing the position of the internal channel of the ball and causing a change in the direction of liquid flow. When the sphere rotates to seal with the valve seat, the liquid stops flowing. The sealing performance of hydraulic ball valves is mainly ensured by the valve seat and sealing ring.

B、 Structure of hydraulic ball valve

A hydraulic ball valve consists of a ball, a valve seat, a valve stem, a handle, a sealing ring, and other components. Among them, the sphere is the main component of the ball valve, usually made of materials such as cast iron, cast steel, stainless steel, etc. There is a spherical channel inside the sphere, which controls the flow of liquid by rotating the sphere. The valve seat is a sealing component of a sphere, usually made of materials such as polytetrafluoroethylene and rubber. The valve stem is a component that connects the handle and the ball, and controls the rotation of the ball by rotating the handle. The sealing ring is used to ensure the sealing performance of the ball valve.

C、 Selection of hydraulic ball valve

The selection of hydraulic ball valves needs to consider the following aspects:

1. Working pressure: Select the appropriate hydraulic ball valve based on the working pressure of the hydraulic system.

2. Flow requirements: Select the appropriate hydraulic ball valve according to the flow requirements of the hydraulic system.

3. Working medium: Select the appropriate hydraulic ball valve material based on the working medium of the hydraulic system.

4. Temperature requirements: Select the appropriate hydraulic ball valve material based on the working temperature of the hydraulic system.

5. Installation method: Select the appropriate hydraulic ball valve according to the installation method of the hydraulic system.

D、 Classification of hydraulic ball valves

Hydraulic ball valves can be classified into various types based on their structure and function, with the following common ones:

1. Fixed ball valve: The ball is fixed inside the valve body and the flow of liquid is controlled by the rotation of the valve stem.

2. Floating ball valve: The ball can freely float inside the valve body, and the position of the ball is controlled by the pressure of the liquid, thereby controlling the flow of the liquid.

3. Three way ball valve: The ball has three channels inside, which can achieve flow control between three pipelines.

4. Four way ball valve: The ball has four channels inside, which can achieve flow control between four pipelines.

5. High pressure ball valve: suitable for high-pressure hydraulic systems, usually made of cast steel material.

E、 Installation and maintenance of hydraulic ball valves

The installation and maintenance of hydraulic ball valves should pay attention to the following aspects:

Before installation, the sealing performance of the ball valve and the flexibility of the valve stem should be checked.

During installation, attention should be paid to the direction and position of the ball valve.

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