Series 22/23

A top stem bushing, retained by a stainless steel ring, is provided to absorb actuator side thrusts and is acetal as standard or PTFE as an option.

The upper stem seal serves to keep any environmental contaminants from entering the stem bore.

Bodies are two piece wafer or lug style and are polyester coated. All bodies meet full ASME Class 150 pressure ratings for hydrostatic requirements.

PTFE impregnated steel bearings provided for precision alignment of the upper and lower stem.

The primary seal is achieved by an interference fit between the extra wide disc hubs and contoured seat.

The seat design reduces seating/unseating torque and, at the same time, reduces wear on the contacting parts. Curvatures machined into the inner seat area minimize contact forces between the disc and seat as the disc approaches, or opens from, the closed position. This unique seat geometry permits lower torques and reduces seat wear.

A resilient seat energizer extends completely around the seat, including the disc hub. This provides uniform force sufficient for bubble-tight shut off.

An extended neck design in all valve sizes allows for 2" (50 mm) of piping insulation and provides easy access for mounting actuators.

Locating holes in the wafer version provide quick and precise alignment during valve installation eliminating disc interference with adjacent pipe internal diameter.

A shoulder is machined into the upper stem. The stem and the disc are pressed together during assembly to become one part, thus the design is a positive stem-to-disc drive connection.

The lined disc has 1/8" (3 mm) minimum thickness of pure, virgin PTFE or PFA encapsulated over Stainless Steel.