Design Features
Metalsin supplies EN 593 wafer type butterfly valves for waterworks engineering. These valves have the following design features:
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- Designed to EN 593: It is the European standard that specifies the requirements for metallic butterfly valves for general purposes.
- Wafer type body: Also known as flangeless body, it is a flat body that has a minimal face-to-face, which is usually equal to twice the required wall thickness plus the width of the valve packing box. The narrow face-to-face length allows the body to be installed between two pipe flanges using a through-bolt connection.
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EN 593 wafer type butterfly valves, handle operated, 4″ PN16, supplied to Panama.
- Concentric design: The disc is concentric with both the valve body and the shaft (stem), providing a simple, balanced structure.
- Rubber Seated: The valve body is internally lined with natural rubber or synthetic rubber such as EPDM or NBR.
- Single shaft & pinned disc: The disc is pinned onto the one-through shaft, which is easy to assemble.
- Handle or gearbox operated, cast iron or ductile iron valve body.
Drawings & Materials
Technical drawings of EN 593 wafer type butterfly valves, A – for sizes 1-1/2″~12″, B – for sizes 14″~24″.
Part Name | Material Specification |
Body | ASTM A126 Class B
ASTM A536 65-45-12 |
Disc | ASTM B148 B95800
ASTM A351 CF8/CF8M
ASTM A351 CF3/CF3M |
Shaft | SS 410/431
SS 304/316 |
Seat Ring | EPDM/NBR
PTFE/Viton |
O-Ring | EPDM/NBR |
Bushing | PTFE
Bronze
Brass |
*Both interior and exterior surfaces of the valves are fusion-bonded epoxy coated.
Sizes, Dimensions & Ratings
Size | A
mm | B
mm | C
mm | L
mm |
1.5" | 70 | 120 | 26 | 33 |
2" | 83 | 161 | 26 | 43 |
2.5" | 93 | 175 | 30 | 46 |
3" | 95 | 181 | 30 | 46 |
4" | 114 | 200 | 30 | 52 |
5" | 127 | 213 | 30 | 56 |
6" | 133 | 226 | 30 | 55 |
8" | 175 | 260 | 34 | 60 |
10" | 201 | 292 | 34 | 67 |
12" | 242 | 337 | 34 | 76 |
14" | 267 | 368 | 40 | 76 |
16" | 316 | 400 | 52 | 102 |
18" | 344 | 422 | 52 | 114 |
20" | 380 | 480 | 64 | 127 |
24" | 468 | 562 | 70 | 151 |
*The pressure & temperature ratings for EN 593 wafer butterfly valves include: (1) Working pressures: 16 bar or 25 bar; (2) Testing pressures: 24 bar or 37.5 bar for shell test, 17.6 bar or 27.5 bar for sealing test; (3) Working temperatures: -20°C to 110°C for EPDM seat, -10°C to 80°C for NBR seat; (4) Suitable media: water, waste water.