It takes 20 seconds for the shut-off valve to close – is this due to the manufacturer cutting corners?
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I tested several units; it takes around 15–25 seconds for them to shut down. The slower the process becomes as time goes on. Could it be that the manufacturer used cylinders of too small a size? The valve body is clearly longer than the cylinder. How to make adjustments so that the shut-off valve can close within 5 seconds?
Are there any pictures showing the position of the solenoid valve in more detail?
1. Requirements of SHT 3005-2016, Specification for the Selection and Design of Automation Instruments in the Petrochemical Industry: 2. Verify the requirements regarding switching time specified in the valve specification sheet. 3. To increase the valve’s switching speed, it is necessary to adjust the gas circuit, such as by increasing the diameter of the gas supply pipeline, adding gas circuit amplifiers, or using quick-release valves.
Based on the image and the owner’s description, it seems that the air inlet valve of the electrical valve is open. There are three reasons for the slow closing of the valve: first, the solenoid valve releases air slowly; second, the spring force in the cylinder is insufficient, resulting in slow reset; third, the valve body is too tight, which also causes slow operation. These factors need to be checked one by one.
At first glance, the valve diameter doesn’t seem too large; check the exhaust in the event of a power loss, as well as the spring
Do not follow the contract; instead, contact the supplier directly to initiate the after-sales process
This post was last edited by The camellias remain as before on 2021-7-5 09:24: use thicker pipes; if that doesn’t work, add accessories such as speed boosters
It’s very likely that the cylinder is too small, resulting in slow movement and thus slowing down the closing speed
It appears to be a single-acting air-operated valve; the air supply pipe is φ8 in diameter. Air intake to the cylinder occurs when the solenoid valve is powered, while air is released from the cylinder when the solenoid valve loses power. Both the opening and closing speeds will be slow; it is necessary to adjust the air circuit of the actuator, and a quick-release valve (with a large diameter) should be added to the actuator itself. An electromagnetic valve used to control the intake and exhaust of air for this quick-release valve can solve this problem. On a side note, if the factory does not specify the timing for opening and closing the valves, the manufacturer will also reduce costs in line with the budget set for the project. It depends on the factory’s requirements as well as whether the manufacturer is professional and honest. Of course, there are also some objective factors.
Cut off in 5 seconds? The specifications require it to be within 10 seconds, and it is used for interlocking purposes. Can the pipes handle cutting that fast? Idiots who work with instruments just assume things without thinking.
That statement sounds a bit discordant. . .