The Valtek MaxFlo 3 valve and NR diaphragm actuator have achieved safety integrity level (SIL) 3 certification of IEC 61508 Parts 1, 2. The MaxFlo3 Valve with NR Diaphragm actuator is a high-performance, eccentric rotary plug design, which is used in low-pressure, high-Cv applications. The double-offset eccentric plug rotates into a seat at an angle that eliminates sliding over the seat surface. The valve can be oriented so that the fluid assists the plug to fail-open or fail-close upon air failure. The actuator is single single-actuating, operates with air from 20 to 60 psi and is field-reversible. — Flowserve Corp., Dallas, Tex.
An SIL 3 rating for this rotary plug valve
| By Chemical Engineering