The triple offset butterfly is one example of the three main valves that can be used for the isolation and control of flow. In most cases, the closing features always come with an integrated disk.
There are three main types of butterfly valves; each adopted for its unique pressures and different usage. They include the zero offset valves, double offset and the triple offset valve as well. To be specific, the triple design helps to mitigate the effects of scratches and stress between the metal components of the valve such as the metal seat as well as the disc. Besides, the triple offset valves are usually used in setting which necessitates bi-directional and tight shut off in chemical companies, gas/oil transportation systems
How was it developed?
Due to the low operating pressures and noncritical purposes, butterfly valves have been a standard solution where the airtight shut off was not paramount. Engineers at the time attempted to use the valves for other applications, and this led to devastating losses thus highlighting the need for a better valve system. The concentric and double offset valves that were available at the time could only be utilized in one direction and with a maximum pressure of 10 bars with low-temperature levels. Nowadays, these valves are mainly used in noncritical systems that can operate at well over 52 bars with temperatures well over 200 degrees Celsius.
However, these types of valves were found to be susceptible to complications brought about by wear and tear of soft sealing materials and failure when used at high temperatures. As the large-scale company operations started to increase in number, manufacturers began to pioneer as more power butterfly valve design where metal-to-metal shutoff could be used to improve the capacities of the valve. "It is this need for a more efficient and effective valve that led to the production of the triple offset butterfly valve, which was considered to be more affordable, compact and space saving as well." states Kevin Paolini of cgis.ca, a triple offset butterfly valve manufacturer.
Benefits of the Triple offset
- The right angle shape of the conical seal and the cam action design eliminates the likelihood of the metal sealing components coming into contact with the final stage of closing, thereby leading to extended functionality.
- These types of valves are considerably affordable than that the conventional types of valves due to the apparent reduction in material type.
- The low torques of the triple offset make it more accessible for automation.
- These valves have lower maintenance levels due to the robust design due to the sturdy design of the replaceable seal and seat components for airtight shut-off.
- No spaces exist between the sealing elements as when compared to the double and concentric offset valves which help to eliminate the compromises that result from debris accumulation.
- The metal to metal sealing allows for higher temperature and pressure applications while improving airtight shut-off.
- This valve is ideal for regulating throttling applications.
Examples of Triple offset valves
Crane FKX 9000
The Crane FKX 9000 is ideal for industrial functionalities where large bore valves are required to handle hot steam or perhaps to isolate parts that have a high/low temperature. Besides that, it can also be used prevent the use of rubber lining elements.
Krombach Triple Eccentric Valves AK110
The eccentric triple valves feature a fabricated design that ranges from 4 to 112 inches. In most cases, the Krombach Triple Eccentric Valves often come with non-rubbing rotation mitigate the effects of torque while enhancing the longevity of the seat.
XOMOX Triple Offset Valves
The XOMOX Triple Offset Valves are ideal for harsh conditions that are important for process applications such as high cycle frequency, steam isolation and provide unrivaled performance as well.