A triple-offset butterfly valve essentially takes the design of a double-offset valve and adds one more offset. This additional offset allows the disc to move closer to the seat during throttling, and it helps minimize scraping between the seat and disc and extends the seat and seal life. This is especially important in applications with abrasive media or with little particles that might clog the valve during operation.Read more:shiphamvalves.com
This design also provides a better seat load distribution over the entire seat ring, which reduces ring wear and makes these valves more durable than conventional butterfly valves. In addition, the non-rubbing rotation translates into a lower operating torque than traditional double-offset butterfly valves.
Choosing the Right Material for Your Triple Offset Butterfly Valve
Another benefit of the triple-offset design is the absence of cavities between the sealing components, which reduces the potential for debris to clog the valve and interrupt the sealing mechanism. This is especially beneficial in abrasive environments and for use in harsh or hazardous conditions, where the valve must be able to operate frequently and with tight shutoff under high pressure.
The triple-offset design also eliminates the rubbing between the hard-faced seat and the seal ring through the flow path, which reduces seating wear and extends cycle life. It also allows the seat to be made from metal, which opens up more applications for this type of valve and allows it to compete with gate and ball valves in terms of recyclability, performance and cost.
Like any valve, the triple-offset valve requires careful attention during installation and regular lubrication to keep it in good condition. In addition, it is critical that this valve is installed in a pipe system that is properly sized and rated to handle its maximum working pressure.