This website uses cookies primarily for visitor analytics. Certain pages will ask you to fill in contact details to receive additional information. On these pages you have the option of having the site log your details for future visits. Indicating you want the site to remember your details will place a cookie on your device. To view our full cookie policy, please click here. You can also view it at any time by going to our Contact Us page.

Solving the problem of cavitation and plugged needle valves

10 December 2013

Problems relating to cavitation and plugged needle valves can be challenging for plant engineers. The AS-Schneider S371 series is said to offer a solution. 

The Y-Pattern Needle Valves Type S371 from Armaturenfabrik Franz Schneider GmbH + Co can be used as shut-off valves in impulse lines, where a low-resistance passage and less deflection of the flow are important, or where the valve must be easily rodded. 

A flow generally does not occur in impulse lines – except when blowing off or flushing the lines. However, while blowing off steam lines, the small flow cross sections and high pressures can result in high flow velocities, which, when combined with deflection of flow, can lead to cavitation which can damage the valve tip and the valve seat.

The AS-Schneider S371 series was developed specifically for this application and, unlike other needle valves, features a truly straight-through design without any deflection of flow. Ball valves also have these good flow characteristics, but here a metal sealed design must be used for high fluid temperatures, which is costly. The S371 Series, therefore, can be a good compromise between the requirements of flow characteristics and valve technology. 

Another advantage of the valve is the space-saving arrangement of the valve head unit relative to the impulse line. 

Contact Details and Archive...

Related Articles...

Print this page | E-mail this page