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Automatic valves react to pre-set parameters, such as changes in pressure, temperature or flow rates, whilst others are manually operated.
- Gate and knife valves are mainly used for on/off control.
- Solenoid valves are electrically controlled pneumatic or hydraulic valves.
- Globe valves have spherical bodies, and regulate flow within pipelines.
- Check valves , or non-return valves, ensure that fluids pass in one direction only.
- Ball valves are good for fast, manual on/off control without loss of pressure.
- Diaphragm valves , or membrane valves, are generally used as shut-off valves within industrial processes, and can be controlled by different types of actuators .

Penstocks , stop logs and industrial pipes are found in other sections of this website.