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Many different sizes, types , and styles from several manufacturesA few;http://www.supplyhouse.com/Erie-Zone-Valves-15921000
A couple here;http://www.supplyhouse.com/Erie-VT3427G14B020-1-NPT-3-Way-PopTop-Series-Valve-8-CVhttp://www.supplyhouse.com/Erie-VT3427G13A020-24V-1-NPT-3-Way-Zone-Valve-15-PSI-7-5Cv
You will want to watch the CV numbers and look for one with the highest you can find. The last link shows the rating is 3.0 which may cause significant flow issues.
The cv number will give you an idea of the size of the hole. The CV rating is the number of gallon per minute to drop pressure 1psi. (1 psi = about 2.3' of head)