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TVN V102 Wafer Type Butterfly valve construction is formed with the centered disc rotating inside the valve body 90 degrees. With the actuation type, the flow of the fluid can be stopped, regulated or started. In a wafer connection, the valve is installed between the pipe flanges and tightened to its place with the bolts for the pipe flanges.
1- Move the two angles with enough distance from the network so that the valve slides smoothly without damaging the lips of the elastic ring. The butter fly will be in half-open position with no projection outside the valve width.
2- Centre the valve with the four screws/ties (two upper and two lower) without tightening them. Test the opening and closing of the butter y to ensure its operation. Place the butter y in perfectly centered position and open taking care not to damage its periphery. Tighten the screws/ties to x the position of the BV.
3- Tighten the nuts until there is metal-metal contact between the body of the BV and the angles of the network. Tighten the screws/ties “diagonally” and progressively. The tightening torque must be adequate to make metal-metal contact and less than the resistance capacity of the screw/tie.
When valves stores for some time, (2 months or more) before storing, storage should be in the original delivery crates or cases.
You should store the valves onthe ground in a clean, dry indoor area. Protect the valve from temperature and humidity extremes, and exposure to excessive dust, moisture, vibration, deformations, sunlight and ozone.
Temperature: storage temperature below 25°C, above 0°C preferable below 15°C.
Humidity: storage conditions should be such that condensation does not occur, store in a dry environment. Maximal 50% relative humidity.
Light: You should protect valve rubbers from light, in particular direct sunlight or strong artificial light with high ultra violet. Ozone: storage rooms should not contain any equipment generating ozone. E.g. lamps, electric motors.
The valves are bi-directional and can be fitted in either direction relative to the ow. The valve will control flow equally in either direction. The recommended installation position is shaft horizontal and the lower disc edge opening downstream (especially for slurry service and media with a tendency for sedimentation). For optimum valve control and smooth performance, it should have 10 to 20 pipe diameters of straight run inlet piping and 3 to 5 pipe diameters straight outlet piping.
Do not use the valve as a crow-bar to spread the flanges, this might lead to damage to the flange area and/or damage to the O-ring sealing.