Ball Valve

February 12th, 2008 admin Leave a comment Go to comments

Ball Valve

Ball Valve's Installation and Maintenance Introduction

1), Check the preparation work before installation

1. Make sure the installation site pipeline is coaxial and the two flanges on the pipeline should keep parallel; confirm the pipeline could support the ball valve's weight. If not, an appropriate support needs to be equipped on the pipeline before installation.
2. Confirm whether there is impurity and welding slag, etc or not in the pipeline. For it must be clean.
3. Check the ball valve's nameplate and do full open and full close operation on ball valve for several times. Check it could be normal operation and excellent without damage.
4. Wash and examine the valve inside is clean after removing protected cover both ends of the valve. For the ball valve's sealing face is ball shape, even a tiny sundry could damage the sealing face.

2),Installation
1. Any part of the ball valve could be fixed at the upstream ends and the hand lever ball valve could be fixed at any position of pipeline. If the ball valve needs to be equipped with actuator (gearbox or electric, pneumatic actuator), the actuator must be vertical. The valve import and export should be in a horizontal position.
2. The flanges and pipeline flanges are designed according to pipeline, which need to equip packing seal.
3. The bolts on the flange should be screwed down symmetrically, gradually, uniformly.
4. If the valve adopts electric actuator, pneumatic actuator or hydraulic actuator, please equipping the air supply and main supply according to instruction.

3),The inspection after installation
1. Finishing the installation, please start the open and close operation several times and you should do it flexibly so that the stress will be uniform and the operation will be normal.
2. According to pipeline pressure design, test the performance of ball valve and pipe flanges' junction surface after pressure opening.
4),Maintenance
1. Only unrig the ball valve's inlet and outlet pressure, and then you could do dismantling operation.
2. At the process of dismantlement and reassembling, you need to protect the valve with sealing spare part, especially the nonmetal, just as o-ring, which would better use the special tool.
3. When the valve body is reassembled, the bolts need to be screwed down symmetrically, gradually, uniformly.
4. The cleaning agent should be compatible with ball valve's rubber, plastics, mental and working media (fuel gas), etc. When the working media is fuel gas, you could choose gas (GB484-89) to clean mental spare parts. While the non mental could be cleaned by purified Water or alcohol.
5. Some single parts that dismantled may be cleaned by baptism. Some mental with non mental that has not been dismantled use the silk with cleaning agent to clean it (avoid the fiber drop off and conglutinate to the spare parts). So when you clean it, please wipe off the things (oil, bilge, gum deposit, dust) on the wall.
6. When the non mental parts finish cleaning, they should be taken out of the cleaning agent at once and should not be dipped in for a long time.
7. Finish washing, you should wait until the cleaning agent on the wall volatilizes entirely and then go on equipping (or use the silk without cleaning agent to clean it). But the time could last long, otherwise the valve will be rust and polluted by the air.
8. Some new spare parts also need to be cleaned before equipment.
9. Use lube to make it smooth. The lube should be compatible with ball valve's rubber, plastics, mental and working media (fuel gas), etc. When the working media is fuel gas, you could use lube-221. Next coating a layer of lube on the surface of sealing install rabbet, on the surface of rubber sealing and on the stem's sealing face and rubbing face.
10. During equipping, it is not allowed to let the metal chips, oil (except prescriptive ones), fiber, dust and any other impurity to pollute, adhere to or stay on the surface of the parts or let it inside.

About the Author

FBIC Inc., a member of Siduona group in flow-control business, has over 15 year experience in manufacturing ball valve, gate valve, globe valve, check check valve, plug valve and butterfly valve in carbon steel, stainless steel Valve.