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Your relay contacts need a snubber and/or MOV/TVS to suppress the inductive spike when switching an AC inductive load (your valve). Without the suppression, the resulting arc can cause the contacts to "stick" (weld).

enter image description here (Image from Red Lion SNUB0000 datasheet)

If your load were DC, a diode across the coil would be the more common solution.

See also http://electronics.stackexchange.com/a/100139/25328https://electronics.stackexchange.com/a/100139/25328

Your relay contacts need a snubber and/or MOV/TVS to suppress the inductive spike when switching an AC inductive load (your valve). Without the suppression, the resulting arc can cause the contacts to "stick" (weld).

enter image description here (Image from Red Lion SNUB0000 datasheet)

If your load were DC, a diode across the coil would be the more common solution.

See also http://electronics.stackexchange.com/a/100139/25328

Your relay contacts need a snubber and/or MOV/TVS to suppress the inductive spike when switching an AC inductive load (your valve). Without the suppression, the resulting arc can cause the contacts to "stick" (weld).

enter image description here (Image from Red Lion SNUB0000 datasheet)

If your load were DC, a diode across the coil would be the more common solution.

See also https://electronics.stackexchange.com/a/100139/25328

3 added 53 characters in body
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Your relay contacts need a snubbersnubber and/or MOV/TVS to suppress the inductive spike when switching an AC inductive load (your valve). Without the suppression, the resulting arc can cause the contacts to "stick" (weld).

enter image description here (Image from Red Lion SNUB0000Red Lion SNUB0000 datasheet)

If your load were DC, a diode across the coil would be the more common solution.

See also http://electronics.stackexchange.com/a/100139/25328

Your relay contacts need a snubber and/or MOV/TVS to suppress the inductive spike when switching an AC inductive load (your valve). Without the suppression, the resulting arc can cause the contacts to "stick" (weld).

enter image description here (Image from Red Lion SNUB0000 datasheet)

If your load were DC, a diode across the coil would be the solution.

See also http://electronics.stackexchange.com/a/100139/25328

Your relay contacts need a snubber and/or MOV/TVS to suppress the inductive spike when switching an AC inductive load (your valve). Without the suppression, the resulting arc can cause the contacts to "stick" (weld).

enter image description here (Image from Red Lion SNUB0000 datasheet)

If your load were DC, a diode across the coil would be the more common solution.

See also http://electronics.stackexchange.com/a/100139/25328

2 added 132 characters in body
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Your relay contacts need a snubber and/or MOV/TVS to suppress the inductive spike when switching an AC inductive load (your valve). Without the suppression, the resulting arc can cause the contacts to "stick" (weld).

enter image description here (Image from Red Lion SNUB0000 datasheet)

If your load were DC, a diode across the coil would be the solution.

See also http://electronics.stackexchange.com/a/100139/25328

Your relay contacts need a snubber and/or MOV/TVS to suppress the inductive spike when switching an AC inductive load (your valve). Without the suppression, the resulting arc can cause the contacts to "stick" (weld).

If your load were DC, a diode across the coil would be the solution.

See also http://electronics.stackexchange.com/a/100139/25328

Your relay contacts need a snubber and/or MOV/TVS to suppress the inductive spike when switching an AC inductive load (your valve). Without the suppression, the resulting arc can cause the contacts to "stick" (weld).

enter image description here (Image from Red Lion SNUB0000 datasheet)

If your load were DC, a diode across the coil would be the solution.

See also http://electronics.stackexchange.com/a/100139/25328

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