1.Attention should be paid to the installation and maintenance of rubber flap check valve
Rubber disc check valve refers to the valve where the stop (disc) moves along the valve seat line. It is reported that this kind of moving style of valve disc, the change of valve seat port is proportional to the way of valve disc. In view of the relatively short opening or closing stroke of the valve rod of the rubber disc check valve, and the very reliable splitting effect, and because the floating of the valve seat port of the rubber disc check valve is in a positive proportion to the distance of the valve disc, it is very suitable for regulating the flow. Therefore, this kind of valve is very suitable for isolation, debugging and throttling.
Once the disc of the rubber disc check valve is removed from the closed position, there will be no trigger between the valve seat and the sealing surface of the disc, so its sealing surface is destroyed very little, so its sealing habit is very good, and the defect is that the particles in the cross flow medium may be sandwiched between the sealing surfaces. However, in case the valve disc is made into steel ball or porcelain ball, the subject matter will be tough and solved. Because the valve seat and disc of most globe valves are easy to be repaired or replaced, at the same time, when repairing or replacing the sealing prefabricated components, it is not necessary to disassemble the inner and outer valves from the pipeline, which is very suitable in the yard where valves and pipelines are welded into one ring and one ring.
The opening and closing parts of rubber disc check valve are plug-shaped disc, the sealing surface is flat or conical, and the disc moves in a straight line along the fluid line. The displacement sample of the valve rod includes the lifting rod type (the valve rod is fluctuating, the handwheel does not rise or fall greatly) and the rising and falling stick type (the handwheel rotates with the valve rod together to rise and fall, and the nut is set on the valve body).
2、 Working mode of rubber flap check valve
Pin lead of rubber disc check valve
The opening and closing parts of the rubber disc check valve are plug-shaped disc, the sealing surface is flat or conical, and the disc moves in a straight line along the line of the valve seat. Stem displacement mode, general name: dark rod, also have the tide up and down type.
General name of rubber disc check valve: rising stem, rubber disc check valve refers to the valve whose sealing element (disc) moves along the valve seat line. Based on this movement method of valve disc, the change of valve seat port is in direct proportion to the valve disc assembly length.
Due to the relatively short open or closed mileage of the valve stem of the rubber disc check valve, which is all the very reliable containment effectiveness, and because the change of the valve seat opening is proportional to the distance of the valve disc, it is very suitable for the flow brokerage.
Therefore, this type of rubber disc check valve is very suitable for plugging, regulating and throttling. When the rubber disc check valve is open, the opening height of the disc is 25% - 30% of the nominal diameter. When the flow has reached the standard, it indicates that the valve has reached the full opening direction.