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Forged Steel Ball Valve vs Cast Steel Ball Valve
Forged Steel Ball Valve vs Cast Steel Ball Valve
2021-06-16

We often regard 2 inch as the dividing line to decide forging or casting of valves. Unlike other valves, the manufacturing method of ball valve is not subject to valve size. Even for big size ball valves, we will use forging way sometimes. Compared to cast steel ball valves, forged steel ball valves can bear more strength and more serviceable. The quality of original material forging is of better quality with less defectiveness. For high pressure working condition, we'd better choose forged steel ball valves. Cast ball valves come with less weight and lower cost than forged one. Xiamen Dervos is an API Certified check valve manufacturing and trading company that specializes in the production of various kinds of valve. In addition to ball valve, we also produce other industrial pipeline valves, such as gate valves, globe valves, plug valves and butterfly valve. To learn more about our industry-leading products, contact us today.

Bellows Sealed Globe Valves vs Ordinary Globe Valves
Bellows Sealed Globe Valves vs Ordinary Globe Valves
2021-05-27

As a component in the pipeline, valves control the connection and cut-off of the fluid. Valve is like a brake pad on the car, one broke, it may lead to unexpected consequences.  Therefore, the valve's performance and service life directly affect the operation of the system. If the valve is damaged, the system must be shut down for maintenance, the losses which brings immensely outweigh the cost of such a few valves. The quality and life of the valve are so important. The bellows sealed globe valve is particularly outstanding in both aspects. Its double seal guarantees zero leakage but also reaches zero leakage in the helium mass spectrometry test. Very safe and reliable. The bellows can be cycled more than 10,000 times without damage, greatly exceeding the service life of an ordinary globe valve packing seal. In addition, the bellows sealed valve can prevent external dust from entering the valve body to ensure the cleanliness of the medium. In conditions such as high-purity silicon powder, pure oxygen, food, vacuum and other working conditions, the bellows globe valves still have a very outstanding performance. In the process of switching, common globe valves will see dynamic friction between packing and stem, and the packing will be worn and fail.  When globe valves are in high and low-temperature occasions, their packing will expand or contract, packing changes, resulting in packing seal failure; As for low-temperature conditions, the packing is easy to freeze,  the packing is easy to be scratched by ice in the witching process. In short, the advantages of the bellows globe valve compared with the ordinary globe valve can be summarized as follows. 1. The bellows globe valve can meet the request of zero external leakage in helium mass spectrometry. 2. The service life of the bellows sealed globe valve is much higher than that of the common globe valve, whose packing is susceptible and replacement frequency is higher. 3. The bellows sealed globe valve has a metal barrier at the stem seal, which can be used in working conditions where absolute isolation is required inside and outside the valve. 4. The bellows of the bellows sealed globe valve can expand and contract, which is not affected by thermal expansion and contraction, and it has very obvious advantages in the occasion of large temperature differences. 5. The bellows valve has double sealing. the bellows instinct, the packing is completely isolated from the medium, which protects the packing well and greatly extends the service life. Dervos is a leading valve manufacturer and provider of engineered products for different industries. If you’re looking for feasible solutions, check out our vast range of high-quality valves which includes gate valves, ball valves, butterfly valves, as well as other control valves and more. For more information regarding our high-quality products, contact us today.

When to use a Knife Gate Valve
When to use a Knife Gate Valve
2021-05-13

Sometimes it is hard to choose between using a knife gate valve or a butterfly valve for certain applications. Both have their merits and both should be picked according to the media and how it will be used. Both are available in manual operation (hand wheel, gear box or lever) as well as withpneumatic or electric actuators Ask these questions before making the choice: l Is the media abrasive? l Will there be large suspended solids? l Is there likely to be solid material present in the line when closing? If the answer to any of the above question is yes, a knife gate valve is what you’re supposed to have. Typical applications for knife gate valves include; - Sewerage & Effluent - Vacuum Trucks - Fluid Transfer Trucks - Slurry - Grain Silos Xiamen Dervos is an API Certified check valve manufacturing and trading company that specializes in the production of various kinds of valve. In addition toKnife gate valve, we also produce other industrial pipeline valves, such as ball valves, globe valves, plug valves and butterfly valve. To learn more about our industry-leading products, contact us today.

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