Topic can be deleted, but i am not able to.
So active mode is when the Arduino is vibrating, bouncing or ?
If You can arrange a more vibration free mount for the controller, relay, it would be good. Know that vibrating cables will break near their ends where they meet the connector.
Likely it can be made by electronics but calculating the vlave open time regarding the current pressure in the tank, I would go for the controller and code.
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Yes indeed
Is this a school/Uni type project ?
There are easier ways , such as a piston pump driven by a geared motor to force grease out, you can even buy cordless greasers , have look at those .
Be aware that solenoid valves need a positive pressure across them to close . So if you have an empty bladder , the down stream pressure ( if there is any ) would make the valve leak .
You might get variations in flow with pressure too
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If you mount it on shock mounts.
Is it even necessary to have a microcontroller? I got the feeling this should also be possible with real simple electronics, but I am lacking the experience.
No but do you think you can build the hardware.
In order to detect active/sleep mode a simple accelerometer
The accelerometer is simple, the code won't be
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You can buy off the shelf timers to activate X seconds per hour but I don't see a reason to change if the arduino setup is already working.
Any controller rated with a Shock/Vibration specification is likely to be expensive; is there any way you can isolate your arduino/relay control from the vibration?
How do you intend to use the accelerometer to detect active/sleep modes and why is it needed?
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Yes this is indeed a uni type project. We know there are purely mechanical options available, but we are investigating this electrical option. Yes we know about the positive pressure, this ain't a problem in our case. Appreciate the tips!
Nope not with our experience, thats why we are asking for recommendations/guidance here 
Do you have some example of those off the shelf timers? Might be interesting for us.
Isolating the electronics from the vibration is not possible in this case.
The accelerometer can detect movements, so when movement is detected we are in active mode. and vice versa. We wanted to use the sleep mode to power down the pressure sensor when not needed to decrease power usage.
Hi,
What is the machine that this project will be maintaining?
Does the machine have an ON/OFF control?
If so, use that to decide active/sleep mode?
Why must it operate on batteries?
Thanks.. Tom.. 
Are you wanting to detect vibration or straight-line movement? Just speculating that a mechanical (non-powered) vibration switch may suffice rather than an accelerometer, which needs electrical power.
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