How to repair gas range valve (regulator)?

Hi all, I decided to go ahead and order the part to try out my luck to repair my 3-year-old Kenmore gas range. Here is a photo of what this valve-kit (regulator) looks like:
Does anyone here has any experience about replacing this kind of valve?? If so could you please share your experience with me? Many many thanks! :)

Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
Add image file
Upload is a website for homeowners and building and maintenance pros. It is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.