Ratgeber zur Auswahl von Drossel- oder Stromregelventil

The choice between flow control valves or throttle valves can have significant impacts.

Therefore, we have explained the basic technical details below:

• What is the fundamental difference between throttle and flow control valves?
  
  • The flow of a throttle valve is pressure-dependent, meaning that with a higher pressure drop across the valve, the volume flow also increases. This causes, for example, the movement speed of hydraulic cylinders to be load-dependent.
    A flow control valve is load-compensated in this regard; regardless of the back pressure, it maintains a constant flow rate.
• Do I need a throttle or flow control valve with an integrated check valve?
  • For flow control valves, a check valve is always required if they are to be flowed through in reverse. For throttle valves, it depends on the application. It is also useful when regulating the extension speed of hydraulic cylinders. With two throttle or flow control valves with check valves, extension and retraction speeds can be adjusted independently.
  • Warning!
    • Without a check valve, it is important to install the valve on the piston side, otherwise a pressure increase may occur.
• What is the difference between 2-way and 3-way flow control valves?
  • 3-way flow control valves direct the excess volume flow to another port. Depending on the valve, this excess volume flow can be used for other applications.
  • 2-way flow control valves block the excess volume flow.

Good to know!

• In constant flow systems, a 3-way flow control valve should be used for continuous flow so that the system does not run permanently against overpressure. The excess volume flow can simply be discharged into the return line.
• In load-sensing or other closed center systems, 2-way flow control valves should be used for continuous flow so that the pumps reduce the volume flow to the desired value.