valve maintenance Archives

Butterfly valve is a kind of valve, it is a control component in fluid conveying system, it has the function of intercepting and adjusting the fluid flow of pipeline system. Butterfly valve is one of the most widely used valves,

U-type-flange-butterfly-valve-2

which can be used to control the flow of various types of fluids such as air, water, steam, various corrosive media, mud, and oil. It is not only widely used in petroleum, gas, chemical, water treatment and other general industries, but also in municipal construction, water conservancy projects, and even cooling water systems in thermal power stations. As a control component, the butterfly valve needs periodic maintenance. Here are the precautions for butterfly valve maintenance:
1. The butterfly valve needs to be fully open and fully closed periodically during the working process to maintain the flexible lubricity of the valve parts and avoid rusting.
2. When closing the butterfly valve, if it is not tightly closed, you can first fully open the butterfly valve again, use the pressure of the fluid in the pipeline to flush out the impurities on the inner wall of the valve, and then close the valve again.
3. Try to filter the impurities in the pipeline as much as possible to avoid squeezing the sealing surface when the butterfly valve is closed, causing the valve to fail to close completely, causing leakage, and causing safety hazards.
4. The opening state of the butterfly plate of the butterfly valve should be greater than 15°, because if the butterfly valve is in a state with a large throttle range, the back of the butterfly plate is prone to cavitation and the valve is at risk of damage.
5. When the butterfly valve is in the middle opening, the operating mechanism needs to be self-locking.
6. Prevent the butterfly valve from mechanical damage, and don’t let the sediments, chemicals, damp gas and other substances in the air corrode the valve and affect the quality of the valve.
7. The threads, bearings, gears and other parts of the working interface of the butterfly valve should be regularly lubricated.

TH Valve is a professional manufacturer of butterfly valve, gate valve, check valve, globe valve, knife gate valve, ball valve with API, JIS, DIN standard, used in Oil, Gas, Marine industry, Water supply and drainage, fire fighting, shipbuilding, water treatment and other systems, with Nominal Diameter of DN50 to DN1200, NBR/EPDM/VITON, Certificates & Approvals: DNV-GL, Lloyds, DNV, BV, API, ABS, CCS. Standards: EN 593, API609, API6D

The sealing performance of the valve refers to the ability of each sealing part of the valve to prevent the leakage of the medium. It is the most important technical performance index of the valve. There are three sealing parts of the valve:

marine valve seat

the contact between the opening and closing parts and the two sealing surfaces of the valve seat; the matching place between the packing and the valve stem and the stuffing box; the connection between the valve body and the valve cover. One of the previous leakage is called internal leakage, which is commonly referred to as lax closure, which will affect the valve’s ability to cut off the medium. For shut-off valves, internal leakage is not allowed. The latter two leaks are called external leakage, that is, the medium leakage from the valve to the outside of the valve will cause material loss, pollute the environment, and cause accidents in severe cases. For flammable, explosive, toxic or radioactive media, leakage is not allowed, so the valve must have reliable sealing performance.

Daily maintenance of the valve:
1. Pay attention to the storage environment of the valve. It should be stored in a dry and ventilated room, and both ends of the passage should be blocked.

2. The valve should be inspected regularly, the dirt on it should be removed, and anti-rust oil should be applied to its surface.

ductile iron, DI, butterfly valve, manufacturer, center line, TH valve

3. The valve after installation and application should be overhauled regularly to ensure its normal operation.

4. Check whether the sealing surface of the valve is worn or not, and repair or replace it according to the situation.

5. Check the wear of the trapezoidal thread of the valve stem and the valve stem nut, whether the packing is out of date and invalid, etc., and replace it if necessary.

6. The sealing performance of the valve should be tested to ensure its performance.

7. The valve in operation should be intact, the bolts on the flange and the bracket are complete, the threads are not damaged, and there is no looseness.

8. If the handwheel is lost, it should be prepared in time and cannot be replaced with an adjustable wrench.

9. The packing gland is not allowed to be skewed or without pre-tightening clearance.

10. If the valve is used in a harsh environment and is easily contaminated by rain, snow, dust, sand and other dirt, a protective cover should be installed for the valve stem. 11. The ruler on the valve should be complete, accurate and clear, and the valve should be sealed and capped.

12. The insulation jacket should be free of dents and cracks.

13. Avoid hitting the valve during operation, or supporting heavy objects.

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Precautions for butterfly valve maintenance

Valves’ sealing requirements and daily maintenance

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