What is the difference between threaded flange valves and flange valves?

Threaded flange valves and flange valves mainly have different connection methods:
A threaded flange valve refers to a threaded connection flange.
The flange valve is connected by welding.
Usage:
Threaded valves are generally used on small diameter pipelines, while flange valves are generally used on large diameter pipelines, or depending on the design.
1. Threaded valve
A threaded valve is a type of valve accessory that mainly refers to a valve body with internal or external threads connected to pipeline threads. Valves with threaded connections are usually used on low-pressure engineering surfaces.
2. Flange valve
English name: The opening and closing part of the Flange Gate Valve is a gate, and the direction of movement of the gate is perpendicular to the direction of the fluid. The gate valve can only be fully opened and fully closed, and cannot be adjusted or throttled.