... more reliable, and easier to install. 1 GENERAL DESCRIPTIONSeries SZ Hand Operating Valve Actuators are a generation of products of ... at home and abroad. Preserving the original performance, Series SZ Hand Operating Valve Actuators are smaller in size, more economical ... depth 40SZ300T43117112453502302896108-M20 depth 35SZ600T50621116254152603658138-M30 depth 45 Series Sz Hand Operting Valve Actuators