Fisher Rotary Control Valve Promises Complete Shutoff

Emerson Process Management introduces the Fisher POSI-SEAL A81 rotary valve. Its tight shutoff and the long seal life capability making it suitable for on/off applications.

Complete shutoff is made possible by the pressure-assisting action of the valve seal ring. The opening and closing path of the eccentric valve disk minimizes contact with the seal ring, thereby reducing seal wear. Interchangeable sealing technology allows the A81 valve body to accept both soft and metal seals.

The POSI-SEAL valve is highly targeted to automated on-off, quarter-turn performance and is typically used with the FieldQ rack-and-pinion actuator. It can be used in most process on/off applications, installing easily in either a horizontal or vertical orientation with no detriment to performance or cycle life.