TISO is a ball check valve used to isolate pumps mounted in parallel; TISO style valves are popular in cyclone circuits.
Typical Use-Standby pumps are often used in critical areas of a process plant. It is quite common to have two or more pumps discharge into a common line leading to the next step in the process. Without the use of the TISO valve, this junction would require a shut-off valve on each pump discharge line to prevent the fluid from flowing back through the standby pump and also to permit isolation of this pump for maintenance.
The TISO Valve performs these functions automatically, without any external energy source. The body of the TISO valve replaces the ‘Y’ fitting, and is designed for maximum abrasion resistance and minimal pressure drop, making it a trouble-free addition to a piping system.