Regarding the full stroke time of the valve
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Question 1: Does the total travel time refer to the sum of the time from start to stop and the time from stop to start, or just the time from start to stop or from stop to start? Which statement is correct? 2. To reduce the full-stroke time of the cut-off valve, given that the air supply pressure and the diameter of the air inlet are fixed, what other measures can be taken in addition to using an air control valve?
This post was last edited by lijie2007521 on 2022-5-30 15:10. If the schedule is fixed, one can only increase the output power of the associated regulator (actuator). However, it is necessary to consider whether the strength of the actuating elements (valve stem, diaphragm, chamber) can withstand their maximum torque or pressure; in such cases, some associated components may also need to be replaced. Additionally, by reducing the travel time, could there be other problems in actual use (such as noise, damage to the seals of the valve components, vibration, reduced lifespan, etc.)? Taking technical, economic, and safety factors into consideration, simply increasing a single parameter or indicator can affect the proper functioning of other elements.
I found a post on the forum that contained an answer stating, “The term ‘full stroke’ as mentioned in the regulations refers to valve actuators; the time value given represents the time it takes for a valve actuator to move from the open position to the closed position, or vice versa. It seems to be a mandatory requirement, ensuring that the valve can be closed or opened within a specified time once it receives a signal, thereby ensuring safety.” So this answer should apply to the first question.
Is this time the no-load time, or the time under actual fluid conditions?
I’m not sure; it should refer to the time during which there are actual fluid flow conditions. Looking forward to an accurate answer
Or. Then, is this reduction in travel time the result of an improvement or a problem that needs to be fixed? If there’s a problem, check the spring, solenoid valve, and valve spool. No problem. It’s difficult to make improvements; it’s simpler to start with DCS to reduce response time.
I just want to make improvements, because there are often emergency shut-off valves with requirements regarding the total time for the entire process.
Personally, it refers to the travel time under actual operating conditions; the valve design data sheet usually specifies this clearly.
The first total cycle time refers to the time from when the signal to open or close the valve is received until the valve is completely closed or completely opened. The second issue is that, with conditions such as the gas source pressure remaining constant, the only way to increase the opening and closing speed of the valve is by replacing it.