The SY series actuator must be mounted at or above pipe center line. Not to be installed below horizontal. The results include the actuator losing the NEMA4/water-tight rating and premature failure.
Additional information can be found in the the following link Butterfly Valve Installation
Please contact technical support to discuss further options in non-conforming installations.
USA 1-800-543-9038
Canada 1-866-805-7089
Brazil +55 11 3643-5656
Latin America & The Caribbean 1-203-791-8396