I can’t understand the data sheet for the pneumatic cut-off valve

The installation direction of the solenoid valve can be changed, or the actuator can be detached and the valve stem rotated 90 degrees.

I know that the air line can be changed; if I submit a request next time, how should I fill it out? It needs to operate in shutdown mode when there’s no power and in on-mode when there is power

I think the gauge you mentioned is fine; it already indicates shutdown in case of power loss. The manufacturer sent the wrong one

I actually want to buy one that turns on when there’s no power and turns off when there is power. How should the data sheet be filled out? I filled it in incorrectly; I don’t know how to do it right

Add a column for Operation mode: Air open/Air close

“The meaning of “fault location: air retention/electrical shutdown” is that the function is lost due to the absence of an air signal for retention/absence of an electrical signal for shutdown.

The fault location being described as “air retention/electrical shutdown” is an imprecise way of expressing it. Gas retention/electric shutdown – let me guess; it should be “loss of gas retention/closure upon power application”. Pneumatic valves generally do not require air retention, so it is easy to misunderstand air retention as loss of air retention ； According to the conventional terms of air-open and air-close, an electric switch can be considered to mean it closes when powered. A proper annotation should include words such as \"gain\" and \"loss\"; there’s no need to omit those words.

The terms \"air retention\"/\"electric shutdown\" are not precise. Write \"See notes\" after Gas Hold/Electric Off. The remarks section indicates that the valve opens when the solenoid valve loses power.

This post was last edited by Mr.King_ePt1i on 2022-2-24 09:14. It is possible for a double-acting cylinder to remain in its closed position when there is no air supply; if it is desired to have it open when there is no power supply, the air circuit needs to be modified, making sure that the solenoid valve is set to the open position when there is no power. But I have a question: if both electricity and gas are cut off, will this fail-safe position still be maintained? If it is currently in the closed position and the solenoid valve is powered, then when there is a power outage throughout the plant, both air and electricity are unavailable. In such a situation, the double-acting cylinder remains in the closed position, and it becomes impossible to open it from that faulty state. Generally, when the valve is in the closed position under powered conditions, isn’t there some kind of interlock or SIS system in place? Have you considered installing an air reservoir to enable the valve to be opened in such cases? As a supplementary note, for electrical power, a UPS can generally be used to ensure the operation of solenoid valves; however, air supply reliability cannot be guaranteed. Therefore, your fail-safe mechanism has two options: it remains in its current state in the event of a loss of air pressure, or it operates when there is a power loss but only if there is also air supply.

There is indeed a problem with your description. Since the cylinder is double-acting, it means it isn’t spring-recovered; therefore, the solenoid valve should be a 2-position 5-way type. As it’s a double-acting cylinder, the failure modes resulting from power loss are different from those resulting from a loss of air pressure. The failure mode due to a loss of air pressure should be of the holding type, i.e., FL, while the failure modes due to power loss can be FO or FC. Your actual requirement seems to be that the failure mode due to power loss should be FO. If you want to use this valve, you simply need to rotate the solenoid valve 180 degrees during installation – in other words, swap the A and B exhaust ports – and that will solve the issue. But I don’t understand why you chose a double-acting cylinder instead of a single-acting one; what’s the purpose of using a double-acting cylinder?