Those relays are unlikely to survive the number of operations you want to use and their rating "Optimistic" in my view . I would use decent quality industrial relay or a semi conductor switch ( solid state relay ) from some where such as RS.
I don't see an issue with this, you may want to check your solenoid for inductance and calculate the surge current and holding current. I didn't see the datasheet. Calculate the impedance using XL= ωL or 2*pi*f*L then calculate for Z by using sqr rt(R^2 * X^2). R being the measured DC coil resistance. You can now use this to calculate current (I=V/Z). the inductance may change when your solenoid is holding vs open. The surge current is the biggest concern to make sure you have enough current to activate this.How reliable is that relay and how long will it last? I might feel better with an Omron or equivalent where you know they didn't cut any corners. Big water bills if and when it fails.
A residential sprinkler valve may be designed to rely on water for lubrication. Is it rated for compressed gas, as well?Paul
I would imagine it is not specifically rated for air / inert gas.I'm only keeping the high-pressure side of the valve pressurized during testing (< 30 min blocks), and regulated well below its rated value (~60PSI v. 120PSI rated). Simply using this for prototyping.Before going to production, will switch to an ASCO 210 or similar (https://www.asco.com/en-us/Pages/solenoid-valve-series-210.aspx). Inert gas rated to 150 PSI, with a regulator on the high-pressure side to keep PSI @ ~40 PSI.
I still have some of the ASCO valves in my junk box. I think their active parts are either stainless steel or chrome plated for corrosion resistance. Good and reliable devices.Paul
I'd be surprised if a sprinkler valve can be used for compressed air.There are a ton of inexpensive air valves designed for that purpose. Just search for solenoid air valve on Ebay or Amazon.However, I would switch the power with a normal solid state relay. Most can switch 24-240 or more volts. They last virtually forever.You could of course use the relay to control the power to the transformer too.P.S Beware of Solid State relays that are too cheap to be true on Amazon & Ebay. They are fake. While they do (usually) work, the internal components are rated for a fraction of the power they claim to handle.