"the very top left guage" = main system pressure gauge. aluminum might work, but unknown about corrosion of agriculture chemicals. Manifold needs to be all "metal" any plastic for Tees, 90's, short nipples / pipes = cracking / busting due to simple vibration and a little tugging from hoses.
(when you open them up there is no reduction inside) quick connect couplers (banjo coupler) you should be able to find 125PSI versions on the cheap made out of sch 80 pvc. you could most likely get away with something costing less. that connects direct to pto snub on back of tractor. You should always install a filter at the start of the system and when you are installing the pipe and valves, be careful to make sure that no dirt enters the end of the pipe.If you had an open-station (non-cab).
Keep the clean - Solenoid valves do not cope well with grit or sand, as this prevents the valve from closing correctly. If you are installing valves below ground then you should use some Manifold swivels, so that the valve can be removed easily during servicing or repair. Maintainance - Valves can be installed above and below ground. If you are trying to control your watering from a low pressure (gravity fed) system, then you may need to look at Butterfly valves With most it will be ~ 0.8 bar, however some will open at ~ 0.2 bar. Operating Presure - Solenoid valves have a minimum operation pressure that they will need in order for the valve to open. (Note: In a power outage situation the valve will therefore close) the power needs to be on to open the valve. 
Type - Most valves used will be 'Normally Closed' valves - this means that no water will pass through the valve if there is no electrical current passing throigh it - i.e. (depending on the transformer you are using) 
There are other voltages available and these maybe suitable for your home automation systems (like Hive) and these can be used with 9, 12 and 24 V and so on. This is used in most applications (large and small) and these valves will generally fit most mains powered control units and are probably the cheapest way to automate your irrigation system. Voltage Rating - The industry standard voltage used to operate most irrigation valves is 24 V. With this in mind, we have catagorised them to help you to find the one for you. There are many types of Solenoid valves used for water control, which can make it tricky to find the right one. Solenoid valves use an electrical current to control the flow of fluid through a pipe.
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