I bought the Valve & Bottle set: SLGPC before, and the sound coming out of the solenoid is pretty loud. Do you have a quieter solenoid or a way to muffle the sound of the solenoid? I tried to cover the whole thing with a sound deadening sponge but it didn’t work very well. If you have any knowledge, please let me know. Thank you for your help.
there is a click when the piston moves but it shouldn’t be too loud. Running the valve at the wrong voltage can drive it harder and produce a louder click so it is worth while confirming the voltage you are using.
To dampen the piston you could try stretching out the spring a little, this would change the performance of the valve a little bit but not enough to make much difference. To stretch the spring you need to dismantle the valve.
If you need very quiet operation you may need to look at non-metal valves. There are several with plastic bodies such as the 2P025-08. Alternatively look at the all-in-one valves. These tend to be slowly though.