https://shahniravoo7-flowcal-0xon.bolt.hostGeneral thumb rule is if there is no downstream restriction pressure drop across the valve = inlet pressure. But if there are downstream restriction (example Nozzles, sprinklers etc) then one needs expert advice as valve choice will heavily impact your system output and cost involve. Minimizing pressure drop many times makes solution unnecessarily costly at the same time right balance is must  for optimizing performance and cost. We recommend expert advice by contacting us at XXXXXXXXX or email us at absdc@rotexautomation.com to guide you further.

** In case your application is not a constant flow but fill or drain type i.e. for you time to fill gaseous media in a container or exhausting it, is important you need to contact expert as it needs advance software simulation to arrive to most optimum solution for your requirement.

Above software will give Orifice size as output as per the same* one can choose most optimum nearby port connection size
Common Port connection sizes: 1/8”, ¼”, ½”, ¾”, 1”, 1.5”, 2”, 2.5”, 3”, 4”
Port Connection type: Internal Threaded with BSP or NPT threads, Flange Connection Class 150 or 300, But weld etc
* if orifice size requirement is 5 mm then ¼” or 10 mm then ¾” or ½”

there are solenoid valves which may see flammable gas in environment occasionally or even continuous basis at such scenario a special explosion proof or Flame proof solenoid valves required (Ex d or Ex ia) Ex Solenoid valves in Refineries, Fertilizer plants,  Some chemical plants, some area of Power plants etc. Also some of the process Critical operation needs SIL 3 rated solenoid valves for high reliability assurance. So one needs to understand whether one needs such SIL3 capability in the solenoid valve for such application.