Valve

Typical valves

Ball valve: DN6~DN1200

Gate valve: DN15~DN4000
Butterfly valve: DN50~DN3000
Globe valve: DN6~DN300
Check valve: DN10~DN2000

Special valves
Micro valves (such as for laboratories): DN1~DN5
Ultra-large diameter valves (such as water conservancy projects): DN3000 and above

API standards: such as API 6D (pipeline valves) and API 600 (steel gate valves) are applicable to the oil and gas industry. 

ANSI/ASME standards: such as ASME B16.34 (valve pressure-temperature ratings) are the basic specifications for general industrial valves.

Ball valve
The ball valve has the smallest fluid resistance among all valve types. Even the reduced diameter ball valve has a very small fluid resistance. The opening and closing part of the ball valve is a sphere with a hole, which rotates around the axis perpendicular to the channel to achieve the purpose of opening and closing the channel.

Plug valve
The valve plug of the plug valve is usually cylindrical or conical, and the channel shape can be rectangular or trapezoidal as needed. This valve has a simple structure, fast switching, low fluid resistance, and is easy to adapt to multi-channel structures.

Butterfly valve
The butterfly valve is a common flow control valve. Its working principle is to control the flow of the fluid by adjusting the position of the butterfly. When the butterfly rotates, the fluid changes its position through the butterfly, thereby changing the size of the flow.

Gate valve
The opening and closing part of the gate valve is the gate. The movement direction 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.

Globe valve
The working principle of the globe valve is to rely on the valve stem pressure to make the valve disc sealing surface fit closely with the valve seat sealing surface to prevent the flow of the medium. When the valve is closed, pressure must be applied to the disc to force the sealing surface to not leak.

Needle Valves
These valves are very similar to globe valves, but have two main differences. First, they are smaller, which can better control flow on smaller lines. Second, they use a conical "needle" instead of a disc-shaped plug, and the orifice needle valve is used for precision flow control.

Solenoid Valves
The working principle of the solenoid valve is to pass an electric current through a coil, so that the coil generates a magnetic field, which acts on the iron core to generate magnetic attraction, and the iron core moves toward the coil, so that the valve opens.

Angle Seat Valves
The angle seat valve is a special type of valve that has a built-in pneumatic actuator and is usually classified as a two-position valve. The actuator can be spring return or double acting, depending on the application requirements.

Energy industry. Including oil and gas, petrochemical, thermal power generation and other fields, valves are widely used to control the flow of liquids or gases.

Chemical industry. In the chemical production process, valves can be used to adjust the flow, pressure and temperature of gases and liquids to ensure the safety and effectiveness of the chemical process.

Food and pharmaceutical industry. In the field of food and pharmaceuticals, valves are mainly used to supervise and control the flow, temperature and pressure in the production process of food and medicine.

Construction industry. In the construction industry, valves are widely used in HVAC systems and water supply and drainage systems.

Aerospace industry. In the aerospace industry, valves are used to control air, fuel and other liquids.