Cowan Connection

Latest News from Cowan Dynamics

Types of Valves

What are valves? Valves are equipment that are designed to control fluids, they can open, close, regulate, or isolate. They can be as small as fractions of an inch and as large as 360 inches. They can be as simple as the copper valve found in a hardware store and as complex as custom-made valves in exotic alloys for nuclear reactors. Valves are one of the oldest products known to man, they are found in many of our everyday activities such as turning on the water in the sink.  Main parts of a valve Each type of valve has its own design features which govern its main parts, however there are 4 main components that every valve regardless of its type. These parts are the stem, the closing membrane, the body, and the seat. The stem: Part that transfer the energy from the operator to the valve...

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What are electrohydraulic actuators?

Electro-hydraulic actuators are devices that operate a valve through pressurized hydraulic fluid, however, their main source of energy is solely electrical. The electrical power supplied is used to energise a motor that runs a hydraulic pump which then supplies the pressurized fluid to operate a hydraulic actuator which controls the valve. The complete system is self-contained, eliminating the need for a separate hydraulic power unit, simplifying system construction and improving safety and reliability. A self-contained electrohydraulic actuator can be used with linear or rotary valves, the need for its use will depend on the requirements of the application. These devices are ideal for operating valves that need large torques or thrusts, or where fail-safe systems or high operating...

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Electrohydraulic Actuator vs. Electric Actuator

Due to their design, electric actuators have limitations in terms of output torques, duty cycle, failure modes, speeds, and vibration resistance.   In severe applications where valves with high torque or thrust must be operated quickly, such as emergency shutdown valves (ESDV), electric actuators have limitations because they can only store a certain amount of energy to operate the valve in the event of a power failure, which eliminates them as options in many emergency shutdown valve applications. In the same way, because they are operated directly by an electric motor, they present limitations in the operating speed; on one hand, the demand increases significantly as the speed increases and on the other hand, their operating speeds are constant since they depend on the RPMs of the...

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Efficient flotation Cell Level Control – AT Actuators for Dart Valves

Flotation cells are mechanical equipment that bring the ore in contact with air, water, and chemical agents. Their main function is to separate the previously conditioned slurry into a concentrate and tailings. The level of these cells is controlled by dart valves, which in turn are operated by actuators. The calculation of the level control valve (Dart) in flotation cells requires high consideration as the goal is accurate flow control to maximize slurry retention time and minimize downtime, therefore a reliable and accurate control valve actuator is essential. Traditionally dart valves use mechanical connections to feed position feedback to positioners that are then used to operate the actuators. The mechanical connections or arms, because they are exposed, are easily jammed, loosened,...

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Water hammer and its effects on valves operation

As we know, most liquids are considered non-compressible which means that no matter how much pressure is applied to them we can not modify their volume, they are not elastic. This characteristic is very useful in power transmission systems such as hydraulic pistons, however, can lead to catastrophic accidents in piping systems. The phenomenon of water hammer is based on this principle, when a volume of a fluid moves through a pipe carries inertia due to its weight, if we close a valve quickly, we are suddenly stopping the movement of this volume, which creates an abrupt increase of pressure, this energy has no way to dissipate or be absorbed due to the non-elasticity property of the fluid, so a wave is created that travels through the pipe until it finds a way to dissipate the energy....

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Electo-hydraulic Actuator VS Hydraulic Actuator

When comparing electro-hydraulic actuators vs hydraulic actuators, the electro-hydraulic actuator is self contained. Bulky and complex piping systems are not needed. The electro-hydraulic actuator control valve provides flexibility to easily control the opening and closing time of the valve. With standard hydraulic actuators cost of installation can be significantly higher due to the hydraulic piping infrastructure required. Whereas an electro-hydraulic actuator is self-contained and can be easily installed within hours. In addition, electro-hydraulics offer a wealth of real-time data to analyze valve/actuator performance over time. When comparing different valve actuators it is best to talk to one of our expert valve actuator sales professionals to help determine the ideal solution for...

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What is an Electro-Hydraulic Actuator

An electro-hydraulic actuator is an actuator that operates a valve via pressured hydraulic fluid however, its main source of energy is solely electric power. ​ The supplied electric power is used to energize a motor that runs a hydraulic pump which then supplies the pressurized fluid to operate a hydraulic actuator for the control valve. ​ The complete system is self-contained which eliminates the need for separated hydraulic power unit, simplifying the system construction and improving safety and reliability.  A self-contained electro-hydraulic actuator can be used with linear and rotary valves. It has been used with butterfly-valves and gate valves for various industrial applications.

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Press Release: C-PAC Module Pneumatic Manifold & Online Store

September 25, 2020   Cowan Dynamics is pleased to announce advancements to their “C-PAC Module” Pneumatic Manifold and the launch of the C-PAC store. The C-PAC (Cowan’s Pneumatic Actuator Control) is an out-of-the-box solution and can save up to 90% in assembly time and easily automate valve actuators without using cumbersome and costly piping to connect various automation components.   The C-PAC Pneumatic Manifold has the following capabilities for linear & 1/4 actuators:  speed control  safety pressure relief  fail-safe capabilities   Reliability & Safety  Valve actuator technicians and Valve Automation Centers have commented on the reliability and performance of the C-PAC Pneumatic Manifold. Its preassembled manifold configuration eliminates potential leak points and...

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Press Release: Expanded E2H Series | Electro-hydraulic Linear Valve Actuator

Montreal, Quebec  July 24, 2020  Cowan Dynamics is pleased to announce the release of their newly expanded E2H Series, Electro-Hydraulic Linear Valve Actuator. The electro-hydraulic actuator combines the best of both worlds of electric actuators and hydraulic actuators for control valve automation.   The E2H linear electo-hydraulic valve actuator replaces the need for separate, bulky hydraulic systems and complex hydraulic piping. In addition, the E2H can replace MOV (electric actuators) where 100% Duty Cycle, High Speed, and fail-safe requirements are of primary importance.   The updated brochure provides engineers with:  Details on How to Configure Multiple E2H Actuators  Mounting Flange Specifications & Dimensions  Bore Size / Motor / Thrust / Speed Specifications  Easy How...

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Valve Actuators & Control Valves

Valves are used to control the flow of fluids in process control applications by opening, closing, or partially obstructing the fluid flow and controlling the line pressure. Depending on the flow requirements of the process system, some method of changing the positions of valves is needed. Some valves are operated with hand wheels or levers. Other valves must be open, closed or throttled frequently. Manually positioning valves in these types of situations is not practical and instead of using hand wheels or levers to control actuation, automated valve solutions such as valve actuators are used to position the valves. What is a valve actuator? A valve actuator is defined as a mechanical device that moves or controls a device such as a control valve. Actuators reduce the need for operators...

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Pneumatic Manifold for Easy Valve Automation

Up to now when you needed a pneumatic control circuit for a double acting cylinder, you ended up with a very cumbersome and costly hardware assembly to setup control valve fail modes. The time and cost required to lay out and bend the various pipes, install fittings, control valves, and filter regulator components can run into the hundreds of dollars for the valve automation center or technician. Now you have an alternative. Cowan Dynamics offers the C-PAC module which is pneumatic manifold saving up to 90% in assembly time. The C-PAC is a one single pop-in unit that can be installed in a couple of minutes on any pneumatic cylinder. The shorter path flows resulted from using a pneumatic manifold for control valve automation reduces pressure drops and improves the overall system energy...

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Press Release: Next Generation AS Series Compact Model | Spring-Return Pneumatic Valve Actuator

Montreal, Quebec May 15, 2020 Cowan Dynamics is pleased to announce the release of the next generation AS Series, Spring-Return Pneumatic Valve Actuator. Based on the proven AS Series, the Compact version was designed specifically for applications where space is a premium. The AS Compact provides amazing reductions, up to 57% shorter and 42% lighter canisters compared to the standard model. Safety Integrity Level The AS Series has a SIL-3 Capable rating, designed to provide reliable actuation in critical applications without compromising the facilities Safety Instrumented Systems (SIS – compliant with IEC 61511/ISA 84). Custom Orders no Longer Needed  Cowan Dynamics has developed a standardized, catalogue-based spring-return actuator solution. Customers can now simply refer to a...

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Press Release: Cowan Dynamics Launches E2HR Electro-Hydraulic Rotary Valve Actuator Series

Montreal, Quebec March 19, 2020 Cowan Dynamics announces the launch of its E2HR Series Electro-Hydraulic Rotary valve actuators. Using proven technology from our E2H Series, the E2HR packs high performance into the smallest possible installation envelope for ¼ turn valve actuating applications. All hydraulic components and sensors are integrated into a single compact manifold block that also houses the actuator and integral oil reservoir. The control panel can be mounted directly to the manifold block or installed remotely to run multiple units from a single control panel This self-contained actuator can be installed either vertically or horizontally and has no external piping.  Available for on/off or modulating applications and for a wide range of markets and valve applications.  ...

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Gas/Oil Rotary Actuators Video

https://youtu.be/HWatXH4HTsI Gas/Oil Rotary Actuators use natural gas or nitrogen gas as the motive power and hydraulic oil as the driving medium to actuate the pipeline valve to a fully open or fully closed position.  High-sulfur natural gas and oil pipelines can use nitrogen gas as a power supply. With the bubble tight pneumatic control manifold, the nitrogen bottles only need to be replaced once or twice a year. The electric line break module allows for real time monitoring of pipeline pressure, pressure drop rate, etc.. Learn more about Gas/Oil Rotary Actuators by visiting our CGO Series page.

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SIL 3 Safety Rating Lineup Video

SIL stands for Safety Integrity Level and Cowan Dynamics has a range of SIL 3 safety certified actuators to meet Safety Integrity Level requirements for flow control equipment and valve automation.  The concept of safety integrity levels (SILs) is now prevalent in the field of safety-critical systems, and a number of standards advocate its use in the design and development of such systems. This rating is designed to provide customers with reliable actuation solutions in critical applications without compromising their Safety Instrumented Systems (SIS – compliant with IEC 61511/ISA 84). Meeting various national and worldwide standards, SIL has four levels used for rating. The higher the level, the better the system performance.  Assignment of SIL is an exercise in risk analysis where the...

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Hydraulic Mill-Type Cylinders Video

https://youtu.be/VjdSv0_f098 Mill-type cylinders are designed to be a more durable, more reliable product to reduce replacement and maintenance costs. It has a high pressure rating that is well above industry standards with a wide ductile iron piston for long bearing.  In Market Example: Improving the control of the production of steel plates on a Duo rolling mill. Learn more and read: What is a Mill-Type Cylinder?

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Air-to-Air Booster Video

https://youtu.be/vV_hlf4cScI Consisting of a basic system plus an air-to-air booster, pneumatic booster air systems are designed for applications in which the available air pressure is too low and where space for additional air tanks is limited. Learn more about pneumatic booster systems by visiting our A2A Series page.

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The Future of Flotation

https://youtu.be/iuiyPZKOwUk Control valve actuators solve the factory linkage arm issues with one simple replacement. See how it works and learn how to get more out of your flotation cells with customized control panels and pneumatic actuators. To learn more about control valve actuators, visit the AT Series page,

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Electro-Hydraulic Valve Actuators Video

https://youtu.be/-GxEsHCqVCY Electro-Hydraulic Actuators are compact, simple, and versatile. Available with On/Off or Modulating Service, the actuators can fail last, fail close or fail open. Low temperature capabilities mean the electro-hydraulic actuator is available for arctic service. Learn more about Cowan's E2H Series by visiting the product page.

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Featured Valve Automation Actuators

A Series Feature

Designed and engineered for severe-service applications, the A Series bore sizes range from 4” to a whopping 42” diameter. We also offer a wide range of automation options.

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AS Series Feature

Next-generation “compact” model provides a shorter and lighter canister for installations where space is a premium.

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ML Series Feature

Our ML Series Double-Acting Hydraulic Valve Actuators are designed to suit a wide range of applications; from commodity to severe-service extremes.

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