Ball Valve Product Introduction

Ball valves and gate valves are both types of valves. The difference lies in their closing element, which is a spherical ball that rotates around the axis of the valve body to achieve an open or closed position. Ball valves are primarily used in pipelines for cutting off, distributing, and changing the direction of fluid flow. According to the GB/T21465-2008 standard "Valve Terminology," a flanged ball valve is defined as a valve in which the closure element (the ball) is driven by the valve stem and rotates around the axis of the valve stem.
 

Advantages of Ball Valves:
Ball valves are a widely used type of valve, and they have the following advantages:

Classification Introduction: According to Structural Classification:

Floating Ball Valve:
The ball in a floating ball valve is floating. Under the pressure of the medium, the ball can move and press against the sealing surface at the outlet to ensure sealing. Floating ball valves have a simple structure and good sealing performance, but the ball bears the load of the working medium and transfers it all to the outlet sealing ring. Therefore, the material of the sealing ring must withstand the working load of the ball medium. This structure is widely used in medium and low-pressure ball valves.
Fixed Ball Valve:
The ball in a fixed ball valve is fixed and does not move under pressure. Fixed ball valves have floating valve seats; under the pressure of the medium, the valve seat moves to press the sealing ring against the ball to ensure sealing. Bearings are usually installed on the upper and lower axes of the ball to reduce the operating torque. These valves are suitable for high-pressure and large-diameter applications. In recent years, oil-sealed ball valves have appeared, where a specially designed lubricating oil is injected between the sealing surfaces to form an oil film. This enhances sealing and reduces operating torque, making them suitable for high-pressure and large-diameter ball valves.
Elastic Ball Valve:
The ball in an elastic ball valve is elastic. Both the ball and the seat sealing ring are made of metal material. The sealing pressure is high, and external force must be applied because the medium pressure alone is not enough to achieve sealing. This type of valve is suitable for high-temperature and high-pressure media. The elastic ball has a slot at its lower end to provide elasticity. When closing the passage, the wedge-shaped head of the valve stem causes the ball to expand and press against the seat for sealing. Before rotating the ball, the wedge-shaped head is loosened, allowing the ball to return to its original shape, creating a small gap between the ball and seat. This reduces friction on the sealing surface and operating torque.

Classification Based on Channel Position:
Ball valves can be classified into straight-through, three-way, and right-angle types based on their channel positions. The latter two types of ball valves are used for distributing media and changing the flow direction of media.


Technical Specification

Notes: The sizes of valve connecting flange and butt-welding can be designed to customer's requirement.


Major Parts Material Form

Product Details

 

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