You seem to want an exact output pressure, a relief valve might get you there, but if it is not precise enough, a pressure reducing valve can be used in addition to the relief valve.
Wilkins nr3xl is adjustable 15-75 lbs. 1" should do the job.
OK here is another way.
Use a cycle stop valve and a very small pressure tank.
My irrigation is set up this way.
Pump is powered always and has a 40/60 pressure switch.
Valve opens, pressure quickly drops from 60 to 40, pump turns on and stays on with pressure at 50psi until the irrigation valve closes. Pressure builds to 60 and pump turns off. No need for pressure relief valve. Cycle stop valve is adjustable.
Im not sure if the pressure variation is a problem.
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