What factors affect control valve performance?

Author:     Published time:2017-03-16 14:17     Reading times:302    

The trick is that you will not realize the many benefits of the control valve unless these valves do their job. Here, we take a quick look at the three main factors that affect the performance of the control valve.

Valve size

Many of today's control valves are oversized. This means that under normal operating conditions, they operate at a low percentage of their rated flow rate.

Excessive valves often occur in one of two reasons.

 In the design process to select the ideal valve, the engineer does not have enough information or has the correct information

• The valve is deliberately added to leave room for future process adjustments.

For whatever reason, if the valve is too large, you lose the ability to control the process variables very precisely. This means that you give up the control valve can bring the quality, efficiency and profitability of the increase.

VALVE RESPONSE TIME

The response time of the valve is the speed at which it reaches its new position after it receives the moving signal. The faster the valve arrives, the more variable the signal can be controlled more precisely in response to a small signal change. And, as we have seen before, precise control is the most important.

When the valve does not move quickly, the result is called "dead time". This is the time between the time the signal is changed and where the valve should arrive. Dead time is basically lost on your production line - it destroys your control and sorts the process changes.

OTHER COMPONENTS OF THE VALVE ASSEMBLY

The control valve can not operate independently. In contrast, each control valve is part of a larger valve assembly - including actuators, possibly locators, and a variety of optional accessories. All of these components as well as the design of the components as a whole contribute to the overall performance of the valve.

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