Last updateThu, 29 Jul 2021 9pm

New Requirements for Actuator Sizing

After decades of confusion, the American Water Works Association (AWWA) has created new standards for actuator sizing that clear up some of the confusion and also provide guidance on where safety factors need to be applied.

Controlling Our Water Systems, Part I

Editor's Note: This article is an excerpt from Cylinder and Vane Actuators and Control—Design and Installation, published by the American Water Works Association in 2015. Part I of this article is an explanation of the types of actuators, how they are used and torque considerations. Part II of Controlling Our Water Systems continues this discussion by explaining further explaining the characteristics of these actuator types.

The Basics of Eccentric Plug Valves

Wastewater systems present many challenges to pumps and valves because the flow can contain grit, solids and debris, depending where in the process the equipment is located. That’s why the eccentric plug valve is often the valve of choice.

Why Air Valves are Needed in Water Applications

Air valves are hydromechanical devices designed to automatically release air and wastewater gases or admit air during the filling, draining or operation of liquid piping systems for water and wastewater services. The safe and efficient operation of a liquid piping system is dependent on the continual removal of air and wastewater gases from the liquid piping system. The following includes an explanation of the effects of air and wastewater gases and their sources in liquid piping systems.

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