ER Valves
Rotary Valves
Rotary valves are a type of valve that controls the flow of fluids (liquids, gases, or slurries) by using a rotating component, typically a cylindrical or spherical element, to open, close, or partially obstruct the flow path. Unlike linear valves, which move a gate or plug up and down, rotary valves operate by rotating the internal mechanism around an axis.
Clark Cooper’s ER Series are rotary valves offered in a range of pipe sizes from ½” to 4” NPT. The ER series offers a distinct advantage for corrosive fluids because the materials for all wetted parts can be tailored for the specific application. It includes a diverse line up of materials including Naval Bronze, Hastelloy and Monel, as well as more common materials like Stainless Steel and Commercial Bronze. The ER series requires no minimum differential pressure for opening, and can handle fluid temperatures up to 550° F. These rotary valves are extremely durable due to their robust design and are often used for dirty, viscous, and extremely corrosive fluids. The ER valves (up to 3") are nationally CRN certified for all Canadian provinces. Additionally, the ER series is available in 2-way valves and 3-way diverting valves.
ER Valves are best if you need...
- 3rd party certification required for a 3” or larger valve (UL/CSA)
- Very corrosive fluids or gases
- Larger pipe sizes (4”)
- Combination of options, i.e., position switches AND manual override
- Various trip options, i.e., trip on loss of power, fusible link (heat actuated), trip/electrical
- High Temperature Rating 550° F
- Watertight, submersible or explosion proof solenoid enclosures
Do you have questions about one of our rotary valves? Our skilled team is ready to help. Contact us today to learn more about our valves or to place your order, and we’ll get back to you as soon as possible.
To learn more, choose one of the flow paths below:
This list contains the options and features available for the ER series valve. 
Download ER Series - Model Number Breakdown