Delivering, storing, and unpacking
For product delivery, we commit that the ball valves will be well-protected from heavy load. After the goods have arrived, users are suggested to check whether the valves and their accessories are in good condition. Instead of using pulling equipment, forklift is suggested for discharging the valve products. Users can refer to Figure1 and Figure2 if a crane is adopted.
For valve storing, a horizontal state should be kept, and heavy load or dust is not welcomed. The valve cap should not be disassembled. It is recommended that the products are stored indoor.
During the whole valve installation process, operators ought to keep the ball valve open. Make sure that the pipes and the steel ball valves are completely cleaned for any impurities can damage the pipes in the future.
The installation location of the valve must be considered convenient for operation. A parallel position between handwheel and operators’ chest would be the best (commonly a distance of 1.2m from the floor is appropriate). For landing valve, the handwheel should be mounted horizontally. And to ensure operators’ safety, an extra space should be reserved when installing valves that stand tightly against the wall or other equipment, especially in conditions with hot water, steam, or other dangerous medium. The handwheel of fixed ball valve should be kept upward. For horizontal pipes, the direction of valve rods can be determined sequentially by straight up, horizontally, and up 45 degrees. A vertically downward installation is unpermitted.
An inspection upon the valve specification, the working condition as well as the valve rod is appreciated before welding. The valve should be kept open. Users can utilize compressed air to remove the iron turning, the sand, and the welding slag in the pipelines.
When lifting the control valve, the rope should be tied to the lifting lug instead of the handwheel or the rod. Operators ought to make sure that the centerline of the valve and the pipe are in a straight line, the rotary shaft is parallel with floor, and the welding port is parallel to the pipe interface.
Before welding, operators should firstly fix the points of 2, 4, 6, and 8 (Figure3), and then weld in an order of 1, 2, 3, 4, 5, 6, 7, and 8, with the upstream port comes the first. Some cooling methods are valued for welding large-diameter ball valves.
To ensure normal running, bypass valve and bottom bracket are elective for large-diameter ball control valves (≥DN600).
For valves with a diameter over DN600, the adoption of bypass valve can help them open smoothly when the upstream water is drained and lead to an instant increase of valve torque.
The bottom bracket can both guarantee the stability during delivery and fix the pipe during installation.
After installed, the valve should be switched to a complete open state. The handwheel is designed user-friendly, so no long level or wrench is necessary to switch it.
When opening the valve, there may be dirt attaching to the sealing face, so remember to wash the dirt away with high-speed flowing liquid and then close the valve. Do that repeatedly until the surface is completely cleaned. If the handwheel is failed or lost, remember to take a new one rather than using a wrench instead.
Before delivery, all of the valves have undergone strict inspection process. Correct valve type and operation method will largely extend their service life. It is recommended that opening and closing operations should be given for each 3 months.
As inappropriate maintenance being one of the most major causes for valve failure, the following points should be minded: small valves should be placed on shelves and large valves on floor in order; do not let the flange surface contact with the floor directly; a dried environment with room temperature should be kept for valves won’t use recently; newly purchased valves should be cleaned carefully.