I have a grinder pump station where an automatic sampler will be required to sample the effluent from the station.  Since the sampler needs "non pressurized" flow and a stream of about 15gpm, the manufacturer's rep has recommended a loop be constructed immediately at the start of the force main.  

It's a 3-inch force main and the loop will be a 1.5 inch PVC going right back into the wetwell, which will be throttled through the use of a valve to achieve the desired 15gpm.  The manufacturer's rep has recommended just using a pvc ball valve in this case, but I'm not sure what other options I might have.  Normally we wouldn't use a ball valve in wastewater applications but perhaps it's OK on a bypass loop such as this?

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Why not put the sampler at the discharge location?  You can drop it down the manhole or whereever the forcemain ends.

I wouldn't be really keen on making a bypass loop like you are talking.  15gpm bypass will really hurt the efficiency of your grinder pump.

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