DN50~DN1000 One Stem No-Pin Wafer Butterfly Valve SS316/SS416 Valve Design: API 609, MSS SP-67

Body Test :1.5 times the working pressure with water. This test is performed after valve assembly and with disc in half position open, it is called as a body hydro test.
Seat Test :1.1 times the working pressure with water.
Function / Operation Test :At the time of final inspection, each valve and its actuator (Flow-Control Lever / Gear / Pneumatic Actuator), under goes a complete operating test (Open/Close). This test carried out without pressure and at ambient temperature. It ensures the correct operation of the valve / actuator assembly with accessories such as solenoid valve, limit switches, air filter regulator etc.
Special Test :On request, any other test can be carried out according to special instruction by client.

Overview:
1.Flange
Flange and drilling to EN1092-2, face to face as per ISO5752 series 14 & ISO5752 series 13.
2.Disc
Streamlined low profile disc ensures the lower flow resistance.
3. Body
Stainless steel welded and finished body seat ensures Reliable and durable performance.
4. Shaft
Disc to shaft connection by means of key, or taper pin.
5. Bearing
Self lubricating bearing of Al-bronze material, free from maintenance.
6. Gearbox
Low torque gearbox can be easily operated by hand wheel or connect with actuator.
7. Top flange
ISO 5211 top flange connect with gearbox or actuator.
8. O ring
Multiple shaft O rings provide long life and reliable sealing performance, which is easy to be adjusted or replaced.
9. Seal ring
T profiled disc seal ring fixed by retainer ensures the reliable sealing performance in both direction, which is also easy to be adjusted or replaced without any special tools

Butterfly valves are used for on-off or modulating services and are popular due to their light weight, small installation footprint, lower costs, quick operation and availability in very large sizes. These valves can be operated by handles, gears or automatic actuators.