SPRINKLER TALK FORUM - You Got Questions, We've Got Answers

In July, I purchased nine adjustable arc sprinklers, and successfully replaced four of my old sprinkler heads with the following units: two Toro V-1550s, one Hunter I-20, and one Toro TR-340. On 09/15/2007, I purchased two additional Toro V-1550s. However, I am experiencing a problem with water bubbling out of the top of the head. I installed one of the Toros and approximately every 5 seconds the water pressure would cause the head to raise up an half of inch to discharge the water. I tried the second unit, and with this one the water continuously bubbles out of the top of the head. My water pressure is approximately 6 GPM, which has not cause any problems with the other units - they are working perfectly. The grade of the lawn is level where this sprinkler is located, so elevation change is not a problem It appears as though the drain check value is not functioning properly; but again, no problem with the other two Toro V-1550s, which I previously installed. What do you recommend to correct the problem? Thanks, g

<blockquote id="quote"><font size="1" face="Verdana, Arial, Helvetica" id="quote">quote:<hr height="1" noshade id="quote"><i>Originally posted by mrfixit</i>
<br />It sounds like your valve is letting water seep through. Water can't get to your sprinklers unless it passes that valve. I'd take the bonnet off and check the diaphram. Look for a small hole or debris. Check the seat itself for any pits or cracks. Good luck!

Thanks for the response. Both sprinklers I tried are new Toro V-1550s, which I recently purchased from Sprinkler Warehouse. I would not anticipate both to be defective. However, if you believe this to be the problem, then I can return them. I did not experince the problem with other two, which I installed. Thanks, g
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Mrfixit, my apologies. It was late in the evening when I read your response. Your response is totally correct. I was thinking spinkler instead of valve, when I responded back. I agree with your suggestion - the valve is probably not sealing properly, which is allowing the water to continue to run in that zone. And although the yard is fairly level, the "problem sprinker" is in a slightly lower portion of the yard. I will check the valve this weekend, and let you know I was able to correct the problem. Thanks again for taking the time to respond to my question. g