Question 1

will this valve maintain its position when the power is out??

Accepted Answer

Yes.  Since it is motor-driven to both the open and closed positions, without power it stays in its current position.

Question 2

Can this valve be manually actuated in the event of power loss?

Accepted Answer

No it can not. No lever etc to move the stem. If you removed the motor cover screws you could push the gear train. That said I have had no issues with the three I'm using. If you buy this valve know that the switches at the end of travel do NOT stop the motor. Power to the motor must be shut down when the switch is hit by the sector gear. The switches are n.o. and close on contact not the other way around. Wire them to an indicator to know when to kill power. So it's backwards. Suppose to be a valve like it with different switches. If you purchase one take the body apart and pipe dope, teflon the center connection. Six months and there still working fine, used three times a week.

Question 3

Can i use these valves for 250psi for water?

Accepted Answer

yes

Question 4

some comments say it still draws some power when in fully open or closed position.  Is this normal?

Accepted Answer

Everyone here is a little correct and alittle wrong, lol
So the 3 wire unit has a common leg (yellow) and 2 hot leads (red and blue). 
Internally there is a relay that reverses the polarity to the motor as the direction of all dc motors is dependat on the polarity. So this is essentially a 2 wire reversing polarity valve with a reversing relay built in. In both directions there are limit switches at each extreme, NO ( normally open or OPEN) and NC (normally closed or CLOSED).  When operating at 12 volts the current draw is on average 30 to 40 milliamps or .04 of an amp. Upon reaching the fully open or closed direction the corresponding limit switch is activated and the motor draw reduces to nothing. HOWEVER, in the open direction the relay is activated and so there is a very minor current draw 3-5 milliamps by the relay.  Another note is that some of these have a bit of mechanical bounce at the end of the travel, so the valves tends to bounce on and off the limit switch a few times until it can keep the limit switch triggered. The good thing is that its in the open position so once it is open you stop applying power and it stops anyway. Another thing to note is that the bacoeng units are about 1.5 times as fast as the us solid ones. Also the 2 wre polarity teversing and the 3 wire ones can be made to go faster by using 24v instead of 12. 
The self closing ones use the same relay setup bilut with a capacitor to store enough power to power it closed when power is removed from its 2 wires. They dont seem to bary speed with voltage. This would be most usefull in replaceing standard normally closed diaphram asco style solenoid valves as the y are always closed when power is not applied.  If you understand wiring enough to use a relay and 2 switches you can wire the 2 wire reversing unit ( which is at the heart of all these units as i explained earlier)  to do any of the functions. I have a momentary spdt  (open) and a latching spdt (close) switches wited to a dpdt relay so that if i leave the latching (closed switch) on the valve will always be closed unless i press the momentary (open) switch  to activate the relay at which time the valve opens and stays open untill i release the open switch which lets the relay deenergize and close the valve. If i turn the latching close switch off then i can open the valve varying anounts by how long i hold down the button untill its all the way open, and it wont automatically close intil i turn the close switch back on.   That way i can use it as a variable output valve or full open or automatically closing valve, my choice.

Material	Stainless Steel
Brand	BACOENG
Exterior Finish	Stainless Steel
Inlet Connection Type	National Pipe Tapered
Outlet Connection Type	FNPT
Number of Ports	2
Specification Met	ma
Valve Type	Ball Valve
Manufacturer	Baco Engineering
Part Number	P0940
Item Weight	1.2 pounds
Package Dimensions	5 x 4 x 3.1 inches
Is Discontinued By Manufacturer	No
Item Package Quantity	1
Batteries Included?	No
Batteries Required?	No

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Baco Engineering 1" DN25 DC12V SS 2 Way Motorized Ball Valve,Electrical Ball Valve CR05

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