Pneumatic Training Course:
Chapter 6 - Explanation of the Hafner type numbering system
In the earlier chapters we introduced you to the most important characteristics of directional valves.
We have summarized them below:
Categorizing control valves by the following criteria (chapter 3):
By design (chapter 4) we have to distinguish between poppet and spool valves. It is important to understand the difference in order to select the right valve for any application.
Introduction to directional valves (chapter 5):
The HAFNER type numbers are a combination of letters and numbers, which carry further meaning. The most important characteristics of the valves are to be found in the type number.
The second block contains information about the number of ports, the number of stable positions and the type of spring.
Block 3 contains information about orifice size and ports.
You can get more information about flow from the catalogue.
As you can see the HAFNER type numbering system is following a standard that allows you to understand what type of valve is in use or required whenever those numbers are mentioned.
An overview about the structure of the Hafner type numbers can also be found on page 16 and 17 in the valve catalogue 2016: