Valves are fundamental control devices widely used in engineering systems to regulate, control, and isolate the flow of fluids (liquids, gases, or steam). Tianjin Water-Seal Valve Co., Ltd. provides an introductory guide to valve technology, covering:
1. Valve Basic Construction
- Valve Body: The main body of the valve, which contains the fluid passage.
- Valve Disc or Valve Closure: The movable part used to open or close the fluid passage.
- Valve Stem: The rod-like part connecting the valve disc or closure, used to transmit operating force.
- Valve Seat: Usually made of wear-resistant or corrosion-resistant materials, it seals against the valve disc when closed to prevent leakage.
- Handle or Actuator: The part used for manual or automatic operation of the valve.
2. Working Principle of Valves:
The basic working principle of a valve is to regulate or shut off the flow of fluid by changing the position of the valve disc or valve cover. The valve disc or cover seals against the valve seat to prevent fluid flow. When the valve disc or cover is moved, the passage opens or closes, thereby controlling the flow of fluid.
3. Common types of valves:
- Gate Valve: Low flow resistance, straight-through flow passage, long opening and closing time, large height, easy to install.
- Butterfly Valve: Controls fluid by rotating a disk, suitable for high flow applications.
- Air Release Valve: Quickly releases air when filling with water, resistant to blockage; rapidly intakes air when draining; releases small amounts of air under pressure.
- Check Valve: Allows fluid to flow in only one direction, preventing backflow.
4. Application areas of valves:
- Oil and gas industry
- Chemical industry
- Power generation
- Pharmaceutical and food processing
- Water treatment and supply systems
- Manufacturing and industrial automation
5. Considerations for Valve Selection:
- Fluid Properties: including temperature, pressure, viscosity, and corrosiveness.
- Application Requirements: whether control of flow, flow shutoff, or prevention of backflow is needed.
- Material Selection: ensure that the valve material is compatible with the fluid to prevent corrosion or contamination.
- Environmental Conditions: take into account temperature, pressure, and external environmental factors.
- Operation Method: manual, electric, pneumatic, or hydraulic operation.
- Maintenance and Repair: valves that are easy to maintain are usually preferred.
Valves are an indispensable part of engineering. Understanding the basic principles and considerations can help in selecting the appropriate valve to meet specific application requirements. At the same time, proper installation and maintenance of valves are also important factors in ensuring their performance and reliability.
Post time: Oct-11-2025
