Can the flow rate be adjusted by changing the opening degree of the ball valve at the pump outlet?
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It is generally said that the pump flow rate can be adjusted by controlling the opening degree of the pump’s outlet valve. But when the valve at the pump outlet is a ball valve, can the flow rate still be adjusted through its opening degree? I hope fellow users can help clarify this! Thank you! This post was last edited by Desert Poplar on 2009-2-22 at 10:30
The range for adjusting flow rate is very small, and the high pressure at the pump outlet makes it difficult to operate the ball valve using a assist mechanism.
Ball valves do not offer as good throttling control as throttle valves, so it is better to use throttle valves. Ball valves may also not perform very well.
It can also be adjusted on a small scale, but the effect is not good.
A globe valve is used to control flow; it’s not recommended to use a ball valve for this purpose, but it’ll do in a pinch~~~:lol
It’s possible, but the effect will be limited as it will create backpressure and there is a risk of leakage from the casing or gland. If flow rate really needs to be adjusted, it can be done by using the control valves on each device. However, your issue is likely related to the cooling water supply system; therefore, I recommend keeping the outlet fully open and adjusting the opening degree of the return butterfly valve to control the flow rate
It is highly recommended not to use ball valves to regulate flow rates, as the range of adjustment they provide is too limited; in situations where fine tuning is required, ball valves are ineffective
It’s possible; it’s best to use a throttle valve!
It is not recommended to use ball valves as control valves at the pump outlet. Ball valves have a quick-opening characteristic and their range of adjustment is very limited; they are primarily used for shutting off or fully opening flow. If left in a partially open position for an extended period, they can damage their sealing gaskets, leading to internal leaks. Gate valves or other types of control valves are preferable to ball valves
After a positioner is installed on the ball valve, it can be used to regulate flow; of course, its accuracy is not as high as that of a positioner installed on a control valve
It can be used, but the ball valve is not sensitive in adjustment. It’s very difficult at extremely low flow rates. If the requirements for traffic aren’t too strict, it can be used without any problem.
It’s possible, but the effect isn’t good! It’s better to use a stop valve!
Installing the locator should work, but the effect isn’t very good. We have used V-type control ball valves, but strictly speaking, they are different from the ball valves mentioned by the original poster
Agree not to use a ball valve as the control valve at the pump outlet. First, the adjustment range is small ； It can also cause damage to the sealing surface of the valve. It’s better to choose another valve.
No, ball valves are of the quick-opening type and have only two states: fully open and fully closed. When using them for the first time, especially when there is no flow from the pump, adjustments can be made within a limited range; once normal operation is achieved, the valve must be in the fully open state. If it is used for shutoff, it will damage the sealing surface, resulting in internal leakage of the valve.
It’s possible, but the effect will be limited as it will create backpressure and there is a risk of leakage from the casing or gland. If flow rate really needs to be adjusted, it can be done by using the control valves on each device. However, your issue is likely related to the cooling water supply system; therefore, I recommend keeping the outlet fully open and adjusting the opening degree of the return butterfly valve to control the flow rate
Ball valves can certainly regulate flow, but the range of adjustment is not very large; therefore they are not ideal for use and fail to achieve the desired results. Frequent use can have an impact on the sealing surfaces, and it is difficult to control flow at low levels. Generally, gate valves and throttle valves are used for such regulation. This post was last edited by yfq4308 on 2009-2-19 08:20
It doesn’t work well; use a throttle valve instead! Additionally: the pump outlet is usually equipped with a resistance control valve, while the inlet has a flow control valve.
Ball valves can regulate flow, but it’s hard to get the right balance! Regulating valves, globe valves, and gate valves can all be used. But I personally recommend gate valves; I believe it’s not possible to keep going to the site for adjustments, and gate valves are inexpensive.