| HAYWARD | Plastic Valves & Flow Control Products - Library |
| 900 Fairmont Ave. Elizabeth, NJ 07207. Tel: (908) 351-5400 Fax: (908) 351-7706 | |
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| Types of Butterfly Valves | |
| Plastic Butterfly Valves | |
| Plastic butterfly valves are available in two types or styles, wafer or lug. A different installation procedure is used for each one. | |
| Wafer Style Valves | |
| Wafer style is the more common of the two and is less expensive than the lug style. The wafer style butterfly valves is just about the “standard”. It’s so common that no one even bother to use the word wafer when ordering a butterfly valve. They take it for granted that if they order a “butterfly valve” they will get a wafer style one. | |
| Wafer Butterfly Valves | |
| Wafer butterfly valves are installed between two flanges using bolts or studs and nuts. This type of installation, of course, makes it impossible to disconnect just one side of the piping system from the valve. That’ where the lug style valve comes in. | |
| Lug Style Valves | |
| Lug style valves have metal inserts installed in the valve’s bolt holes. These inserts are threaded on both ends. This allow them to be installed into a system using two sets of bolts and NO nuts. The valve is installed between two flanges using a separate set of bolts for each flange. This set up permits either side of the piping systems to be disconnected without distributing the other side. | |
| Lug Style Butterfly Valves | |
| Lug style butterfly valves used in dead end service generally have a reduced pressure rating. For example most sizes of Hayward butterfly valves mounted between two flanges have a 150 psi pressure rating. The same valve mounted with one flange, in dead end service, has a 75 psi rating. | |
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| Copyright HAYWARD Industrial Products, Inc. 1999 | |