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Thanks for all of your resonses. As someone mentioned above, that "i/p is just the interface between the electronic signals and pneumatic." So, is the answer to the "when do I need I/P" is really: depends on what kind of actuator we select and what kind of signal the controller put out? A...

I am just learning more details on control valves and its components. Since now I'm starting to see the real objects instead of on paper (P&ID), I've noticed things that I never thought of before such as: 1. Positioner on control valve. My understanding is so it's there to release/add air to...

Thanks for all the responses. The solenoid conditions are: Fluid: natural gas Min P: 0 psig Max P: 130 psig Max Rate: 300 slpm Line size OD: 3/4" The vendor came back with: Orifice size: 3/4" Line Size: 3/4" Cv=5.8 (per catalog, the title shows "Cv value water (gpm)") So, when I calculated...

I'm about to purchase several solenoid valves (will be used as an ON/OFF valve). My questions are: 1. can someone inform me more on the solenoid valve. i.e. why we use it, when to use it and when should we not use it 2. The flow I sent the vendor is in slpm, and the fluid is gas (don't ask me...