The POSI-SEAL rotary valve (photo) is suited to on/off process applications requiring tight shutoffs. The pressure-assisting action of the valve seal ring enables complete shutoff. By minimizing contact between the seal ring and the valve disk, seal wear is reduced. A related product from the same company is a newly introduced butterfly valve offering high throttling performance, ideal for applications that involve fast processes and varying pressure drops. — Emerson Process Management, Hatfield, Penn.
This rotary valve is designed for complete shutoff and long life
| By Chemical Engineering