Need a 42 inch swing check valve for raw sewage service. Due to piping limitations, I am looking for a short body (such as wafer style) swing check valve for sewage application.There is a third possibillity: to use a motorized knife-gate on/off valve if you are near a pumping station or an electrical outlet. This will need time to close and will not protect you by power failure. If you are considering this you will have to check consequences of pressure peaks if you are pumping and the pumps closes down suddenly by power failure. You will also have to consider UPS if you need protection by power failure. One of the problems with swing-check 'dog type trap door construction' valves with wafer type building length is that they will be reduced bore and be limited in opening (bang agains pipeline 'roof'. Better is as mentioned before doble 'butterfly' check valves, or as mentioned perhap double eccentric single butterfly with counterwieight and perhaps dampening cylinder. This will be the nearest you can come a full opening with a short building length. I do not know of any other construction giving you what you want with a short building lkength.

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