Flow control valves

Flow regulators

Flow regulators are called flow control valves or flow regulators (also called flow-through valve or throttle valve). These valves are used to regulate the flow rate of the medium used. Flow control valves are used in hydraulics and pneumatics to regulate the flow of hydraulic fluid or compressed air.

What types of flow control valves are there?

Flow control valves are divided into:

  • Throttle valves
  • Flow regulators

With a throttle valve, the greater the pressure difference, the greater the volumetric flow rate, since the volumetric flow rate depends on the differential pressure at the throttle point.

In contrast, a flow regulator (volume control valve) operates using pressure compensation. This ensures that the set volumetric flow rate remains unchanged even if the pressure level across the valve changes.

Flow control valves in industrial automation

Festo offers a wide range of flow control valves for industrial and process automation. Discover our portfolio of flow control valves: throttle valves, one-way flow control valves and time delay valves.

Throttle valves

Throttle valves are part of the category of flow control valves. They restrict the flow of the compressed air in the flow direction. A throttle valve is used to regulate volumetric flow rates. The restrictor creates a narrowing of the line's cross-section – it is a localised flow resistance.

Throttle valves

One-way flow control valves

With one-way flow control valves, the flow in one direction is restricted, and is free in the other. One-way flow control valves are used to adjust the speed of pneumatic cylinders, while flow control valves, on the other hand, are used to adjust the flow of air or a fluid.

One-way check valves

Time delay valves

Time delay valves switch over after a signal has been output and once a preset time has elapsed. They are used in simple pneumatic controllers, in addition to, among others, logic valves.

Pneumatic timers

FAQs – frequently asked questions clearly answered

What do flow control valves do?

Flow control valves are used to adjust the speed of a cylinder or the rotational speed of a motor. Both variables depend on the volumetric flow rate, which must be adjusted.

How does a flow control valve work?

A flow control valve works on the basis of pressure compensation. This means that the set volumetric flow rate remains unchanged even if the pressure level across the valve changes.

What is the function of a one-way flow control valve?

A one-way flow control valve ensures that the medium (gas or liquid) only flows in one direction and cannot flow back. One-way flow control valves open automatically as soon as the liquid or gas begins to flow. When the direction of the flow changes, the valve closes.