Basic Butterfly Valve Designs

The "MONARCH" butterfly valve incorporates the most desirable engineering features with the best suited materials into a valve that is efficient, durable, and reliable. provides a selection of sizes from 2 through 24-inches with a choice of three body styles, molded-in or cartridge seats, five types of operators and a variety of component material combinations.

Butterfly valves have widespread usage, and with an ever increasing number of new applications being determined, their popularity is rapidly increasing. In paper mills and cement mills, chemical and food processing plants, water filtration plants, petroleum product lines, air conditioning and water control...in fact, practically anywhere there is a flow of fluid there is a use for "MONARCH" valves.

These valves are rated for temperatures up to 180°F and are bubble-tight at pressures up to 200 psi for 2 through 12-inch sizes --150 psi for 14 through 24-inch sizes. The Buna-N seat is scientifically dimensioned to give maximum resiliency under the seating land of the disc. Other seat materials also are available.

This permits optimum disc impingement for greater seat tightness, without overstressing the liner. The disc edge is precision ground, finished and hand polished to assure long life and trouble-free operation.

All "MONARCH" butterfly valves are compact and space saving. They are easily installed in new piping or readily used as replacements in existing piping.

Wafer Type Body

The wafer type valve is designed for quick installation between pipe flanges. No gasket is needed because the molded-in seat is lapped over into a recess in both faces of the body ends. This portion of the seat is a labyrinth type of heavy multiple ribs of buttressed design and serves as a seal between the valve and pipe flanges. Bolt holes are provided in the body of valves 14-inch and larger to facilitate alignment with pipe flanges.

Wafer Lug Type

Wafer lug type valves, except for their lugs completely around the body, are the same design as wafer type valves. In some lug type designs, the lugs are simply drilled to match ANSI (American National Standard Institute) 150-Pound Steel (and 125-Iron) drilling templates. drills and taps the lugs so that when the valve is closed, upstream piping can be left intact while downstream piping is dismantled for cleaning, revamping, etc...or, if the valve is utilized for pipe-end applications, only one pipe flange is necessary.

Two-Flange Type Body

The two-flange type valve, except for body and seat design, is the same as the wafer type. The seat is not lapped over the body ends, and a gasket is required as a seal between the pipe flanges and body flanges.