Walz & Krenzer knows hatches, especially mid to small size ones.
Hatches larger than 48” or those designed for high pressure usually require some type of power assist or hydraulic operation due to their weight. Options include complete power operation or power opening and closing of the hatch with manual dogging. All hatches can be flush or raised, depending on their location. All control systems, whether they are for hatches or doors, can be supplied intrinsically sage and/or explosion proof.