Missed Approach Climb gradient and missed approach requirements

[FlightPathOBN]

For the 737, Vref rule of thumb was based on 40T and flaps 30.

Then Vref can be est with -1 less/at than 40T and 3 kts above fl30

So at 40T, with flaps 30 equals 40x3-1=119kts as a standard Vref

for 40T at flaps 40 = Vref 30-3 kts or 116kts...

As you increase the weights, with flaps 30 as the ref...you get the actual CAT reference..

Regarding previous comments, I am not sure about ATC ops vs criteria in the US, but in all of the other places, from the IF inbound, if you go missed, you are required to follow the missed approach procedure (which may include descent because of crossing paths) and to harmonize with departures, LAHSO, etc...