Do you want a complete guide for installing the bellow globe valve? Do you want to know how to install and maintain bellow globe valves in the system? Bellow Globe Valves are often used in food, chemical, and heat transfer systems. They adjust the flow of fluid or other toxic substances through a pipe. They are a perfect choice for the system because they seal when closed.
The valve installed on the pipeline must have the area for operation and maintenance. For flanged stop valves, users should select bolts according to the temperature and medium. For butt-end valve construction, cast must will weld and heat-treat to given standard requirements. Welding must be performed by skilled personnel only after process qualification. You should check the location arrow while opening and closing the valve. Overusing the “F” twist can show warping of bellows and damage to inner parts.
Installing a bellow globe valve is not a complex process. But you need to follow the proper way to prevent problems. It is also essential to install the valve to function as planned. Many leakages occur when any problem issues are seen in installation. To stop these troubles, we must explain the proper valve installation guide below.
This installation guide has some necessary steps for operating industrial globe valves. It will answer questions and help in choosing the best method for implementation.
What are Bellow Globe Valves?
A bellow globe valve is a type often used to control the flow of gases and fluids. It consists of a circle-type body inside that has a movable disk element. The disk is connected to a stem to open or close the valve. Commonly Globe valves use in industrial applications where controlling fluid is needed.
They have rotatable discs to seal the flow part, as opposed to a pivoting “flap” seen in most other valves. When the valve opens, the discs will not be in touch with the surface they were sealing against. This permit the process to flow into and out of the valve with zero resistance. When closed, the discs create a seal that allows the valve no leakage between the other points.
Construction of A Bellow Globe Valve
A globe valve is used for controlling the flow in a pipeline. Globe valves are often used in applications where accuracy need.
The structure of a globe valve is simple. The body of the valve is often made from cast iron materials such as brass or steel less steel. The plug of a round-shaped part attaches to a stem that runs through the body’s center. The stem is used to open and close the valve and is connected to a handwheel on the exterior of the body surface.
What Should You Do Before Installing The Bellows Globe Valve?
Here are some points you keep in mind before installing valves in the system. Check the valve’s standard, design, structure pressure, and calibre complete the requirements. Be sure the mark of the arrow on the point of the valve is in the flow direction of the pipe medium.
Before installation, also remember the sealing surface is clean and bolt tie. Horizontal pipeline valve stems are more valuable to be the vertical direction. Downward stem causes maintenance but also hurts the valve itself.
Also, keep in mind to drain out water. In the case of low temperature, if there is water in the valve hole, bellows sealed valves are easy to harm. So, water should exhaust before installation to avoid icing.
Bellow Globe Valve Installation Steps
You can understand that installing bellow globe valves is not such a difficult task. The Globe valve is unidirectional and only takes flow under the disc. The body has an arrow indicating the direction of flow. Yet, it is simple to check by examining one end of the valve.
This will allow visiting if the valve is facing the top of the seat. The handwheel process will ensure that the valve is not damaged. Here are bellow the main points of the globe valve installation position.
- Carry out any debris or other packing material.
- Keep the inside of the valve dry.
- Check the valve support in the right way. This can cause baseless long runs clamping into the valve.
- Make sure to have a suitable space to use the valve
- Complete a dry cycle to change the position of the valve from opening to closing and opening back again
- In a diagonal pattern, tighten the flange bolts in a slow direction.
- Increase the internal pressure until the bolts are correctly installed.
- Increase internal pressure to working levels and then recheck the system.
- Here are some basic steps that you should need to install an industrial globe valve:
- Unwarping the valve: The first step toward installing an industrial valve is to open or unwrap it. Before opening, you should read and understand all diagrams and instructions on the packaging.
- Positioning the valve: The next step is to position the valve. Placing the valve includes finding the best location for the up and downstream links.
- Pressure testing the valve: The next step is testing the pressure of the valve. This is important to confirm that the functioning of the valve is good. If pressure does not pass, the valve will need to be replaced.
- Mounting the valve: when the pressure testing is complete, it is time to climb it. Make sure the valve is tied in its mounting location.
- Finishing installation:
- The final step in installing a bellow globe valve is finishing the installation. This step contains attaching the valve to the up and downstream connections.
- Next steps: Finally, move on to the future steps. This contains starting the process and confirming that the valve performs as desired.
After Installing a Globe Valve
After installing, take a few steps to secure working at peak performance. This contains maintenance tips to help obtain the most out of the valve.
When the medium temperature exceeds 100℃, the packing gland should open and then tighten on the packing. The Bellow valve does not touch the surface when the fluid temperature is high or low, and the valve has no insulated part.
The moving parts of the valve, such as the valve stem nut, the sliding nut, and the support, are easy to get dust and oil media. Dyes, which quickly cause valve corrosion, are hazardous to combustion gas. They should clean to the functional needs.
Reasons for Leakage of Bellow Seal Glove Valve
Bellows valve leakage is generally divided into internal and external leakage because the liquid medium contains impurities that damage the sealing surface.
- The basis for the valve stem’s leakage relates to the valve’s structure, working, and operation mode.
- The valve stem takes a dual sealing system of bellows and packing. The bellows weld with the outer and inner lining to form a bellows body. And then welded the valve with the stem give body to block the fluid leakage by the valve stem. The stem of the bellows valve forces up and down until the upper-end contacts the down end of the lower packing. The material of l ower packing PTFE. If the valve opens too much, the flat key will embed, the bellows valve can no longer open and closed, and the bellows assembly knocks to stop.
- To the line of working, extension and contraction of the bellows valve causes leakage. The bellows may damage if contraction crosses the limit, resulting in seal failure. So, you need to improve the limit for opening and closing so that the valve always contracts in the design range.
Maintenance Methods
Regular checks and maintenance will keep the bellow valve last for a long. It is important to maintain the valve. These are some things that one should consider for maintenance. This includes proper checking and cleaning to prevent damages or issues. If any issue occurs, make sure to correct the matter soon.
- It is right for the valve to cycle if it is not used repeatedly. It will keep that the disc does not become lodged in the seat.
- Frequent checking of the valve suggests. You should look out to the gland to checkout there is no visible wear or if the valve is dripping.
- On the crossbar, use the grease nipple, use a grease gun, and if needed, grease the spindle.
- If the packing need to improve, tighten the bolts but do not tighten them.
It is important to check that the valve must remove from the main line to allow for review. This is to confirm there is no water in the pipe and that it must cool down to room temperature. Checking needs to take after the valve. This includes checking the valve seat and the disc and can remove any scale from the bottom of the valve.
Summary
All above, we have discussed the right guide for installing the bellow valve. In this guide, you also learned the main point that keeps in mind before or after installation. Hope you understand; if you have questions about installation, feel free to contact us.
