discharge valve

I want to put something on my sprinkler pump on top, going from output to the control valves. If it ever pumps into a "shut off" valve, it could damage the pump.
Does anyone know of something inexpensive that will serve as a discharge valve? Idea being that it will discharge it to the ground until end of cycle.
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What you want is a water pressure relief valve that will open if the pressure goes higher than normal if the sprinkler valves don't open. It needs to open a a higher pressure that will not occur if the system is operating normally. Like this:
http://www.freshwatersystems.com/p-5484-pressure-relief-valve-34-mipt.aspx?affiliateid=10053
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