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.
Oscillating Valve Type PFF 520 701:
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.