KSB Valves Dealers

SehestedHjelm1193 | 2021.12.06 21:10 | 조회 12


1. Why is the two-seat valve prone to oscillation when working under small opening conditions?




For single-core valves, when the medium is flow-open type, they're stable. If the medium is flow-closed type, they're unstable. There're two valve cores in the two-seat valve. The reduced core is within flow-closed condition whilst the upper core is in flow-open condition. In this case, under small opening conditions, the flow-closed form of valve core will easily cause oscillation in the valve. This is the reason two-seat valves can be used for small opening conditions.

2. Why can't double-sealing valves be harnessed for sanitary shut-off valves?

Two-seat valve core has the benefit of balanced force double-sealing valve structure, allowing a large pressure difference. And its shortcoming could be that the two sealing surfaces cannot be in good contact concurrently, resulting in a large leakage. If it is purposefully and mandatorily used in shut-off occasions, the effect will not be good, even if lots of improvements have already been made on it. (such as double-sealing sleeve valve)

3. How come the straight stroke sanitary regulating valve have a poor anti-blocking performance and rotary stroke regulating valve have a good anti-blocking performance?

The main of straight stroke valve is vertical throttle, but the flow direction of the medium is horizontal. So there has to be lots of twists and turns in valve cavity flow channel, making the flow paths with the valve very complex. Therefore, there're plenty of blind zones that provide space for deposition with the medium, which ultimately causes clogging. The throttle direction of rotary stroke valve is horizontal, the medium horizontally flows out and in, which could easily remove unclean medium. Meanwhile, the flow path is easy, then there is little room for medium deposition, so rotary stroke valve includes a good anti-blocking performance.

4. Exactly why is the stem of straight stroke regulating valve thin?

It involves an easy mechanical principle: the greater the sliding friction, small the rolling friction. The stem of straight stroke valve moves up and down. When the stuffing slightly pressed a bit tighter, it might summary the stem tightly, resulting in a large hysteresis. To this end, the valve stem is made to be thin and smaller than average the stuffing use PTFE that has a small friction coefficient in order to lessen the hysteresis. Perhaps the biggest issue that derives from this is that a thin valve stem is easy to bend as well as the stuffing carries a short service life. To fix the challenge, the easiest way is to apply rotary valve stem, a regulating valve like the rotary stroke ones. Its valve stem is 2-3 times thicker than that of the straight stroke valve. And it uses graphite stuffing that features a long service life. The valve stem stiffness is a useful one, the service lifetime of stuffing is long, the friction torque and hysteresis are instead small.

5. Each and every the rotary stroke valve use a relatively large shut-off pressure difference?

The reason is that the torque for the rotating shaft made by the force of medium on valve core or valve plate is extremely small.

6. How come the service time of desalination water medium short when utilizing rubber lined butterfly valve and fluorine lined diaphragm valve?

The medium of desalination water contains low concentrations of acid or alkali, which can be pretty corrosive to rubber. The corrosion of rubber is exemplified by expansion, aging and low strength. Poor people aftereffect of using rubber lined butterfly valve and diaphragm valve is actually caused by the intolerance of corrosion of rubber. Rear rubber-lined diaphragm valve is improved is the fluorine lined diaphragm valve which has a good tolerance of corrosion. However the lining of diaphragm of fluorine lined diaphragm valve can't withstand the up-and-down folding and it is broken, resulting in mechanical damage and shorter service lifetime of the valve. The actual easiest way is with water treatment special ball valves, that you can use for to eight years.

7. How is it that shut-off valves use hard sealing?

Sanitary shut-off valves require the leakage to become low. The leakage of soppy sealing valve could be the lowest, so the shut-off effect is undoubtedly good. However it is not wear-resistant, not reliable. Judging from your double standard of small leakage and reliable sealing, soft sealing shut-off just isn't as good as hard sealing shut-off. Take full-featured ultra-light regulating valve for instance, it's sealed and piled with wear-resistant alloy for cover, highly reliable, has a leakage rate of 10 to 7, that have met the requirements shut-off valves.

8. Why can't sleeve valves replace single-seat and double-seat valves?

Sleeve valves, which first appeared inside the '60s, were trusted from the '70s worldwide. Sleeve valves are the cause of a big percentage in petrochemical equipment imported during the '80s. In those days, a lot of people thought sleeve valves could replace single-seat and double-seat valves for being the second-generation products. Up to now, which is not true. Single-seat valves, double-seat valves and sleeve valves are equally used. That is because sleeve valves only improve the strategy for throttle, have better stability and maintenance than single-seat valves. But its weight, anti-blocking and leakage indicator are identical to that relating to single-seat and double-seat valves.

9. Exactly why is selection more valuable than computation?

Compare computation with selection, selection is more important and more complicated. Computation is just a simple formula. It isn't the formula itself, but instead the precision of given parameters that matters. Selection involves lots of things, as a bit careless will lead to improper selection, which not just leads to the waste of manpower, material, and money, but the outcomes of use are certainly not good, causing a variety of problems being used, like reliability, service life and quality, etc.

10. Exactly why is piston actuator increasingly found in pneumatic valves?

For pneumatic valves, the piston actuator may make full use of air pressure to really make the sized the actuator less space-consuming than that of the show type. The thrust is larger. The O-ring in the piston can be more reliable in contrast to the show. All in all, it's increasingly used.

Annually KSB manufactures almost a million valves. All the different valves being offered attracts numerous applications.
We are Dealer & Exporter of all kinds of business Valves in India, Located in Mumbai, Established in 2005.


For more details about KSB Valves Authorised Dealers just go to this web portal: web link
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