Find min date for each stage of a process [duplicate]

Name    Value   AnotherColumn
-----------
Pump 1  8000.0  Something1
Pump 1  10000.0 Something2
Pump 1  10000.0 Something3
Pump 2  3043    Something4
Pump 2  4594    Something5
Pump 2  6165    Something6

My table looks something like this. I would like to know how to select max value for each pump.

select a.name, value from out_pumptable as a,
(select name, max(value) as value from out_pumptable where group by posnumber)g where and g.value = value

this code does the job, but i get two entries of Pump 1 since it has two entries with same value.