how much pressure drop this valve has as soon as one of faucets opens up

I Think You’re Confusing PSI Pressure Per Square Inch, And GPM Gallons Per Minute... The Watts Pressure Reducer Comes Factory Set At 50 PSI... Most Homes Have Between 60-70 PSI From Either Your Water Utility, Or Your Well...

Does this 3/4” prv come with any o rings?

Yes, it comes with 1 union and 1 o-ring, not 2!!

Can i adjust pressure on this valve?

Yes, it does allow you to adjust pressure by turning the top adjustment screw.

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Specifications

Material	Lead Free Cast Copper Silicon Alloy
Brand	Watts
Item dimensions L x W x H	2.44 x 5.63 x 7.38 inches
Exterior Finish	Stainless Steel
Inlet Connection Type	National Pipe Tapered
Outlet Connection Type	FNPT
Maximum Operating Pressure	4E+2 Pound per Square Inch
Number of Ports	2
Specification Met	lead free
Valve Type	Pressure Reducing Valve
Manufacturer	Watts
UPC	098268332391
Part Number	0009477
Item Weight	1.81 pounds
Product Dimensions	2.44 x 5.63 x 7.38 inches
Item model number	3/4LFN45BUM1
Is Discontinued By Manufacturer	No
Color	Stainless Steel,Brass
Item Package Quantity	1
Measurement System	inch
Batteries Included?	No
Batteries Required?	No

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