NAMUR Case for Smart Valve Automation
August 14, 2017
valves
3 great things you need to know about valves
October 5, 2017

Oscillating Valves

Oscillating valves generate continuous cycling of an actuator.

When compressed air is applied to port 1, the outlet ports 2 and 4 are alternately supplied with compressed air.

The valve always moves the position as soon as the cylinder has reached the end position and a back pressure is applied to the and-gate in the valve.

The speed of the operated cylinder and therefore the frequency can be adjusted by adding flow regulators to the exhaust ports 3 and 5 of the valve.

Example applications:

  • Reciprocating
  • Scraping
  • Wiping
  • Roll Polishing
  • Winding
  • Tensioning
  • Spraying
  • Raking
  • Diverting
  • Cleaning
  • Dipping

Oscillating Valve Type PFF 520 701:

  • Air-flow: 1.250 l/min
  • Port-size: G 1/4″
  • Pressure range: 2-10 bar

The function of an oscillating valve can also be simulated by a set of two pneumatically actuated bistable valves from the standard Hafner range. The stroke frequency can be adjusted by two uni-directional flow regulators.

This solution offers the advantage that the customer is independent on the air-flow. The P-valve that is connected to the cylinder has a separate air-supply and therefore the customer can use every size from the Hafner range (up to G 3/4″ with 6.000 l/min air-flow).

1. Solution: Oscillating movement starts with pressure at port 1.

2. Solution: Oscillating movement starts with electrical signal at the solenoid valve.