Threaded ball valves are essential components in fluid control systems. Valued for their reliable sealing, durability, and ease of operation, they are a popular choice for regulating and controlling the flow of various liquids and gases. This article provides a comprehensive overview of threaded ball valves, covering their definition, working principle, classification, and application areas.
Definition of Threaded Ball Valves
A threaded ball valve is a type of ball valve that connects to piping via threaded ends. The valve body features threads (typically NPT, BSP, or metric) at both ends, allowing it to be screwed directly into threaded pipe connections without the need for welding or flanges. Internally, it contains a ball with a through-hole; rotating the ball 90° via the valve stem allows for full opening or closing.
Working Principle
Threaded ball valves control fluid flow by rotating the internal ball. When the through-hole in the ball aligns with the flow path, fluid passes through the valve; rotating the ball 90° closes the valve, thereby shutting off the flow. This ball design enables rapid, efficient operation while ensuring reliable shut-off and control capabilities.
Classification of Threaded Ball Valves
Based on body structure, threaded ball valves are classified into three types: one-piece, two-piece, and three-piece.
One-piece: Features a single-piece cast body and a compact size. It typically employs a reduced-bore design and cannot be disassembled for maintenance.
Two-piece: Consists of two sections secured by threads and features a full-bore design; it is currently the most widely used model on the market.
Three-piece: Comprises three body sections connected by four bolts; it supports in-line maintenance without requiring the disconnection of threaded pipe connections.
Application Areas
- Chemical and Petrochemical Industries: Compatible with various corrosion-resistant body materials to ensure safe media transport.
- Power and Energy Sectors: Used for flow regulation and on/off control; also applicable to piping systems associated with waste heat power generation.
- Construction and Building Automation: Integrated into water supply and HVAC systems to precisely regulate the flow and pressure of water and gas media.
- Semiconductors and Precision Manufacturing: Electric threaded ball valves enable high-precision flow control (±0.5%) for the precise regulation of process gases—such as in electrode foil production—and support networked remote monitoring.
