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Yup. Valve isn't supported per se, but we do support 'on' and 'off' commands which you could apply to the valve.
Yo can configure your device on aws iot and then write control logic in smart home skill adaptor lambda code.
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ISSUES of 'proactivelyReported' does not work && 'there was a problem'
Does "implicit targeting" only work with the latest Smart Home Skill API?
is there explicit support in the smart homes skills for zwave barrier
Can I customise the response of Smart Home?
"I am not quite sure what went wrong" message from Alexa, but executes the Lambda for the skill and device responds