What Are Process Control Valves? are critical to the establishment of an efficient process and smooth running over the lifetime of a system. The controller sends signals to the valves which can change the size and direction of fluid flow, and in turn affect other process parameters, such as liquid level, temperature and pressure.
How to Choose a Control Valve?
There are many types of valves available, each having its advantages and limitations. The basic requirements and selection depend on their ability to perform specific functions such as:
Ability to throttle or control the rate of flow.
Lack of turbulence or resistance to flow when fully open as turbulence reduces head pressure.
Quick opening and closing mechanism – rapid response is many times needed in an emergency or for safety.
Tight shut-off prevents leaks against high pressure.
Ability to allow flow in one direction only – prevents return.
Opening at a pre-set pressure – procedure control to prevent equipment damage
Ability to handle abrasive fluids – hardened material prevents rapid wear.
This article discusses basic valve types, types of actuators, control actions, types of positioners.
Based on control actions, they are linear motion and rotary motion
Linear valves, also known as multi-turn valves, have a sliding-stem design that pushes a closure element into an open or closed position. Common valves are globe valves, gate valves.
Rotary motion is also known as quarter-turn valves. Quarter turn valves will be in their fully open or fully closed state (0°) after a 90° turn of the stem.
Their operation is much quicker than linear motion valves. Common are ball valves, butterfly valves.
In addition to the above-discussed tips, you can discuss your requirements with the manufacturer. Whenever you are considering these valves for your project, ensure that they are sourced from a reliable supplier like Ningbo Lida Pneumatic Complete Sets Co., Ltd, you can click https://www.nblida.com/product/control-components/ to learn more information about