Diminishing functionality of combustion turbine components due to aging parts is a concern for plant and maintenance managers. The harmonization of each individual part of a machine is crucial to efficient operation, and that is especially true in aging 7E, 7F and 9F combustion turbines. The valves, which were originally branded as Dana-Gresen and distributed by Tri-Line Automation, have been supported and manufactured by Parker for many years. As the parts continue to age, there is increased potential for inefficiency and performance issues. So, when is the best time to take a deeper look at your vintage turbine valves?

The answer is yesterday. It’s never too early to have a replacement on hand or get your current valves serviced. If you’re too late in responding to the potential issues, your production, efficiency, and uptime will all suffer. Find out why right now is the time to inspect your turbine valves. 

 

 Plan to register for our upcoming webinar, Parker Legacy Valve Service: How to Maintain the Future of Your 7E/7F Turbine Valves.

  Valves that need an inspection

There are three  combustion turbine control valves that all plant and maintenance managers should keep on their radar:

• Gauge Selector Valves
• Fuel Oil Isolation Valves
• Water Staging/Isolation Valves

Each valve has a different purpose, but if any of the aging valves are overlooked, they may cause issues or even unplanned shutdowns. 

Gauge Selector Valves

This valve allows for fuel pressure measurement of each supply line feeding the combustion cans. With 20 to 30 years of wear and tear from stagnant fluids or heavy cycling, the condition of this valve should be closely monitored. 

There are many potential issues that may occur. First, the gauge selector handle may become hard to move. An even bigger concern involves fuel oil pressure leaking into the common port connecting the fuel pressure gauge. This type of leakage would result in the gauge always showing some amount of fuel pressure, regardless of the selector handle position. As with most elastomeric type seals, thermal and process exposure contribute to a limited seal lifespan. 

Fuel Isolation Valves

This large multi-port “check valve” delivers fuel to the primary and secondary ports on each combustor can, only permitting fuel flow when actuated. Fuel isolation valves are actuated by a single-piston to ensure each combustor can get fuel at the same time. This eliminates the risks of turbine cold spots and avoids startup or fuel transfer issues. This valve also has zero internal leakage and has a limit switch to confirm the valve operation. 

While there is no internal leakage to a fully functional valve, there is likely internal wear and damage due to old, dirty, and stagnant fluids, which could eventually lead to corrosion and leaking. 

A new fuel isolation valve offers protection against the risk of cold spots. Contamination can cause restrictions that create an increased pressure drop across the valve, resulting in less than the desired amount of fuel being delivered to the engine. Contamination, corrosion/erosion, and heavy cycling can also cause internal leakage across the check valves and in extreme cases, external leakage. 

Water Staging/Isolation Valves

The water staging/isolation valves control water that is used for NOx reduction and combustion temperature control. They also have the same number of ports as the gas turbine has combustion cans. 

The potential issues for water staging/isolation valves are identical to the fuel isolation valves. Valves with 20 to 30 years of wear are more likely to experience pressure spikes, leakage, and control issues. The longer a valve has been in service, the greater the possibility of internal wear, corrosion, and seal degradation.

 

 

 

Why now?

Based on the vintage of the turbines and valves and a recent spike in requests for service and overhaul, it is crucial to understand the condition of the valves at your power plant. Parker has developed a Valve Service Plan for the replacement or refurbishment of these valves scheduled around your planned outages, minimizing disruption to plant operations.

Plant and maintenance managers should begin thinking about replacing these aging valves prior to planned spring or fall outages, avoiding downtime during the year. The inspection of these valves is important to the performance of 7E, 7F and 9F combustion turbines, and the age of the valves is enough reason to assess them immediately. 

What should you do next?

The next step is to rely on Parker. We have been an experienced and trusted partner in the industry for decades, and our goal is to help you minimize downtime, create efficiencies, and increase plant output. Inspect your valves and schedule a call to discuss Parker’s Valve Service Plan with the Energy, Oil & Gas Team. Learn more on our turbine valves website.

If nothing is wrong with your valves, that’s great! But it is never a bad idea to have a known support path, contacts within Parker’s manufacturing operations, experienced field-based engineers, and spare parts on the shelf! 

If you just want to learn more about the valves in your combustion turbine and the importance of their maintenance, register for our webinar: How to Maintain the Future of Your 7E/7F Turbine Valves, which takes place at 11 a.m. ET March 18.

 

 

Article contributed by James Hoke, capital projects manager, Parker Hannifin’s Energy Team, and 

 

 

 

 

 

Mitch Eichler, business development manager, Parker Hannifin Hydraulic Valve Division

 

 

 

 

Related, helpful content for you:

Replace Turbine Valves to Prevent Unexpected Shutdowns on the Plant Floor

Reduced Maintenance for Dual Fuel Gas Turbines With New Check Valve Design

Eliminate Maintenance Concerns on Gas Turbine Fuel Control Valve

Why Choose an Electric Starter for Your Gas Turbines?

 

Not every application needing reliable seawater to fresh water supply is located on a sail boat, motor boat or fishing vessel. When boat owners need simple, automatic or manual operation, a design for limited spaces and heavy-duty construction, they turn to Parker and our array of known brands: Village Marine, Sea Recovery and Horizons Reverse Osmosis. However, Parker watermakers are also used in remote applications to deliver purified water from salt water or a land source for on land consumption.

 

The challenge

Living on a remote tropical island may sound idyllic, but it comes with some harsh realities. Power. Water. Access. And destructive weather.

An example is the Bahamas. Little Hog Cay is a completely private, 20 plus acre barrier island in the Northern Bahamas with lagoons, beautiful white-sand beaches and land elevations to 30 feet. The island is located in the Hog Cays, one mile from mainland Abaco or five minutes from the airstrip and full-service marina at Spanish Cay. It is centrally located between the top four Abaco sportfishing destinations Walker`s Cay, Green Turtle Cay, Treasure Cay and Marsh Harbor.

After Hurricane Dorian in 2019, the island owner was forced to replace several key infrastructure items, one of which was the water purification system, consisting of a water maker, pumps and storage tanks. The initial call to the Parker service teams was prompted by the customer who was trying to install a Parker Village Marine Little Wonder Modular LWM 145 Watermaker with a 12 VDC system. 

Rather than mounting on an ocean vessel, the customer was installing the unit on land to provide water for drinking, ice, and water gardens. He intended to use salt water as the source and needed technical support on the related equipment required to supply the source water to the unit. The customer submitted a request for technical assistance on one of our Parker websites. The email was routed to Parker's Pan Am group and the technical team at the Bioscience and Water Filtration Division. The customer included a phone number and location on the request but did not provide an email address. Due to the remoteness of the location, cell service was challenging. The team was able to reach out to the customer via Whatsapp — a social media application. 

Understanding the logistics Dockage: 

Little Hog Cay is the only private island in North Abaco with completely protected deep-water dockage. The island is approached from the Abaco Sound carrying depths of 12 feet or more at low tide. A 90-foot channel leads to a fully-enclosed 30 by 155-foot slipway with depths of 8 feet at low tide. Outside the slipway, on the Sound, a double-point Manta Mooring System is installed. In addition, shallow-draft vessels can be anchored inside the lagoon. The entrance is located on the Atlantic Ocean side and carries 6 feet of draft at low tide.

Power: 

After the island was badly damaged in Hurricane Dorian, the system was rebuilt and reengineered. The off-grid solar-powered system had most of the 90 solar panels fixed or replaced, adding Enphase microinverters to each, and replacing all the destroyed lead acid battery banks with reclaimed lithium batteries from crashed Tesla vehicles as the power storage system. This installation was the first in the North American continent to use an entire Tesla Model 3 battery pack - 75 kWh of power storage. Also, there is an additional 45 kWh of Tesla Model S reclaimed batteries. This is supplemented with two small wind turbines that can produce a theoretical 2.8 kW of peak power, but realistically produce approximately 900 W, almost constantly.

 

Water:

Salt water requiring desalination. The island originally had a 1,200 GPD watermaker that was destroyed by Hurricane Dorian. The owner was challenged by constant repairs and also determined the system was more than the needs of the island required. An analysis of time spent in the repair of the unit versus time running showed it would run for one day and then not for 3 weeks. 

The intent was to produce water on a much more frequent basis (constantly when the sun shines), without a huge power draw. A smaller watermaker unit — the Parker Little Wonder LVM — was selected to match the needs. The system produces a continual supply without the noise of a traditional watermaker. In addition, the unit is set up to filter the clean water a second time (customer preference, but not required) to produce 9 ppm for ice and drinking water. 

The customer built a smart monitoring system using Home Assistant (on a Raspberry Pi) that monitors the solar radiation from the island's Ambient Weather station. Based on the time of day and level of sun, it will switch on the Little Wonder watermaker. Three 33’ x 13’ water storage tanks are located below the pavilion. The smart system will switch on the Parker watermaker to ensure there is enough water for personal use and to run the auto irrigation systems.

  How we helped

The selection of the Little Wonder Modular (LVM) 145 watermaker with 12 VDC was ideal for use in the customer's remote location. The power source on the island was solar power and the LVM can run on 12 V power.

When the customer began installing the unit, he realized that due to his land-based application, the transfer pump needed to be reviewed. Even though a transfer pump was supplied with the Little Wonder LVM unit, installation is usually on a boat where the distance between the transfer pump and watermaker unit is relatively close. In this case, the transfer pump needed to supply the head pressure to move water from the salt water source to the watermaker unit mounted location. On the Little Wonder LVM 145, Parker supplied a raw water boost pump with a magnetic drive.

Parker's technical team reviewed the installation details provided by the customer. The technical team provided specific recommendations on the installation location for the transfer pump, which was as close to the source as possible. The Little Wonder LVM 145 requires .5 GPM, so a boost pump with 2-4 GPM was sufficient. A centrifugal pump was recommended by Greg Newman, Parker sales manager, to deliver 50 psi or less to the high-pressure pump. Technical schematics for the LVM unit were also provided. 

Original message from the customer:

"Hi, I have the LWM 145 GPD watermaker unit - very cool!! I am setting it up on my island here to use to water my plants and make some drinking water and ice. I need to install a raw water pump to deliver the water to the unit. What PSI do I need to deliver the saltwater at and what flow rate? Thank you in advance."

Customer - Island Owner

 

The product

The Village Marine Little Wonder Modular Series Watermaker is the ideal reverse osmosis desalination system for experienced sailors and boaters who require small low-power watermakers. Capable of producing up to 145 GPD (550 LPD), the Little Wonder is designed for cruising sail boats and land applications where space and power are limited and reliability is required. The system is simple to install and easy to operate. High-quality components ensure safety and years of reliable service. Featuring a compact, modular configuration, this desalinator is the most reliable, field serviceable, quiet, efficient and economical source of fresh water available on the market today.

Technology:

• Adjustable 316 SS pressure regulating valve provides constant pressure. No fluctuating pressure and low noise.
• Easy to operate high-pressure bypass valve controls the operating mode from cleaning/rinse to reverse osmosis.
• High salt water rejection rate.
• Product sample valve included.
• CIP system allows membrane cleaning/pickling by simple to use cartridges.
• Optional remote instrument panel configuration for LWM units.

Meters and monitors:

• Product flowmeter to monitor gallons per hour of fresh water produced.
• Glycerine filled high-pressure gauge to assure accurate reading of operating pressure.

Service/maintenance:

• The unit is simple to install and easy to operate.
• Supplied with cleaning and preservative chemicals to keep the system in prime working condition, plus a spare pre-filter cartridge.

Pump:

• Titanium high-pressure pump is impervious to the corrosive sea water environment and designed for maximum efficiency, producing more water with less battery power.
• This pump is single-piston and a low RPM high-pressure pump.
• Raw water boost pump with magnetic drive provides extra feed pressure.

Materials:

• 12 V, permanent magnet motor has significant reserve capacity for long life (on DC-powered units).
• Equipped with special hi-rejection aqua pro membrane(s).

Safety:

• Components that go into the units ensure safety and years of reliable service.
• Product sample valve included.
• Cleaning valve included.

Accessories:

• Manual fresh water flush.

 

Results

The fact that our application engineers across the country were able to find a way to reach out, answer questions, and provide the right recommendations for auxiliary products that keep customers supplied with clean fresh water is part of who we are at Parker. We always enjoy reading follow-up testimonials from the users of our products:

"The quality of the Little Watermaker is way better than any other desalination equipment I have used before (and I have used a lot). But the thing that really astounded me was the amazing quality of the support! I could not hold back my enthusiasm for the professionalism, and my amazement that I had finally found a company that is happy to embrace a modern communication standard (in this case WhatsApp) to ensure the products are working as they should! 

Wow, you guys are AMAZING!! Literally - you have a customer for life and I will influence many, many, many others. I absolutely love the quality of the product, your manual/documentation and that you included a full schematic!! The point that you responded so quickly and on WhatsApp further confirms the professionalism of your company. I own a small island in the Bahamas - and companies like yours make it soo much easier to do what I need to do. Thank you very much!"

Customer - Island Owner

 

Leading with purpose

After more than a century of experience serving our customers, Parker is often called to the table for the collaborations that help to solve the most complex engineering challenges. We help them bring their ideas to light. We are a trusted partner, working alongside our customers to enable technology breakthroughs that change the world for the better.

 

This article was contributed by Paul Kamel, product manager II, Parker Bioscience and Water Filtration, and 

 

 

 

 

Greg Newman, leisure sales manager, North American, Caribbean, South American, Parker Bioscience Water Filtration Division. 

 

 

 

 

 

 

 

*Images supplied and approved for use by our confidential customer.

 

Additional and helpful content on Parker Watermakers:  

Desalination System Provides Ultra-Pure Water for Offshore Oil and Gas Rigs

Improving Efficiency of Marine Desalination Systems

Compact Watermakers Are Highly Efficient and Virtually Noiseless

Parker Filtration Technology Supplies Clean Water to Typhoon Haiyan Survivors

From Saltwater to Safe Water - Disaster Recovery Efforts

 

 

Plastic is one of the largest and most important markets for process and precision cooling and is a critical success factor in the production of formed plastics. Precision temperature control ensures dimensional stability of the plastic product and enhanced quality of the finished product. Failure to provide sufficient cooling can result in surface flaws in the finished product, such as blistering, roughness, structural defects and opacification.

The most common forms of plastic processing that require precision cooling are:

• Injection moulding
• Extrusion moulding
• Blow moulding / PET forming

 

For more detailed information on the importance of process cooling in plastic manufacturing applications, view our interactive.

 

 

 

Cooling in the plastic injection moulding process

The injection moulding process accounts for a significant proportion of all plastic products manufactured globally. Injection moulded products range from electrical switches, wheelie bins, to complete car dashboards. The process is compatible with both thermoplastic and thermosetting plastic material. Commonly used materials include: polystyrene, ABS, polyamides, polypropylene, polyethylene and PVC. Almost all manufacturing sectors use injection moulded parts in some form.

The following diagram depicts a typical injection moulding machine. Click to enlarge.
 

Cooling is essential to the process and is used for the following purposes:

• Cooling of the mould to reduce cooling times prior to ejection of the finished product from the machine.
• Removal of heat load from the machine's hydraulic motor system used to drive the mechanical parts.

Injection moulding - cooling of the mould

The injection moulding process consists of four stages. The cooling phase is critical to the process and often involves direct cooling from a chiller.

Clamping

The two halves of the mould must be securely closed by the clamping unit prior to injection of the molten plastic. The clamping device provides sufficient force to hold the mould in position during injection. The clamping set up generally takes more time with larger machines that can generate more force.

Injection

Raw plastic material (generally pellets) are fed into the injection moulding machine and enter the screw assembly. Heat and pressure are applied to melt the raw plastic as it moves through the screw. The molten plastic is rapidly injected into the mould with the pressure ensuring the mould is entirely filled.

Cooling

The water-cooled mould ensures that the plastic starts to cool as soon as it contacts the interior surface of the mould. As the plastic cools, it solidifies into the shape of the desired part. Shrinkage of the part may occur during cooling. The packing of the material during the injection stage allows additional material to flow into the mould reducing visible shrinkage.

The cooling of the mould is important as the product can’t be ejected until it is sufficiently cool. Efficient cooling increases product throughput and prevents unnecessary downtime. Water is generally used as the primary cooling agent. Water is channelled through the mould to facilitate a quicker cooling time. Decreased mould temperature is generally more efficient allowing for faster manufacturing cycle times to be achieved.

Ejection

After sufficient time has elapsed, the cooled part is ejected from the mould by the ejection system located at the rear of the mould. When the mould is opened, a mechanism is used to push out the part. Once the part is ejected, the mould can be clamped shut for the next shot to be injected.

 

Injection moulding - cooling of the hydraulic system

Injection moulding machines typically use a hydraulic pump and circuit to power the screw, press, mould and ejection componentry. Hydraulic fluid is moved by a pump and that generates significant heat during operation. Approximately one-third of the electrical installed power must be removed from the system to prevent machinery issues. Insufficient cooling prevents optimal operation of the press; this results in problems with the plastic maintaining its shape in the mould. Loss of batch quality and increased rejection rates alongside frequent equipment downtime originate from poor cooling capability.

The hydraulic system generally employs the use of an oil to water heat exchanger. In many cases a chiller can be used to supply cooling capacity directly to the oil to water heat exchangers, in larger installations where multiple machines are in operation.

Cooling capacity is generally supplied to the injection moulding machine through two independent water cooling circuits:

Higher temperature loop for cooling the hydraulic oil application. Chillers are often used in conjunction with free cooling and a water tower as part of a system to supply cooling capacity to multiple applications.

Lower temperature loop for the plastic mould cooling. The cooling water is typically delivered between 10 – 15°C.
 

 

Precise cooling is not as critical for the hydraulic oil application, temperature control for cooling the mould tends to be more critical. Precision cooling is important to deliver the correct finished quality and increase productivity. In many cases, a separate chiller will be installed for each injection moulding machine to manage heat loads.

Cooling in the plastic extrusion process

The plastic extrusion method is generally used for high-volume manufacturing where raw plastic material is melted and formed into a continuous profile. Extruded plastic products include: pipe & tubing, weather stripping, window frames, plastic sheeting, adhesive tapes and wire insulation.

The following diagram depicts the stages of the plastic extrusion process. Click to enlarge.
 

Thermoplastic beads are gravity fed from a top mounted hopper entering the barrel of the extruder. A rotating screw forces the plastic beads forward into the barrel which is heated by resistors to the desired melt temperature. Extra heat is contributed by the intense pressure and friction taking place inside the barrel.

At the front of the barrel, the molten plastic leaves the screw and travels through a screen pack to remove any contaminants in the melt. After passing through the breaker plate, the molten plastic enters the die that is responsible for forming the final product shape.

The product must be cooled as it leaves the die; this is generally achieved by drawing the plastic through a large water bath. In tube or pipe extrusion lines, the product is often cooled in a sealed water bath with a controlled vacuum to prevent the newly formed molten product from collapsing. Once the product has been cooled it can be spooled or cut into lengths for later use.

For products such as plastic sheet or film, the cooling is achieved by pulling through a set of cooling rolls. In sheet extrusion, these rolls not only deliver the necessary cooling but also determine sheet thickness and surface texture.

Cooling in the extrusion blow moulding process

Extrusion blow moulding is commonly used to produce plastic beverage bottles. Around 508 billion plastic bottles were manufactured in 2018 with growth to 583 billion by 2021. Almost all plastic bottles were manufactured using the blow moulding technique. Most of the plastic bottles destined for the beverage market are manufactured from polyethylene terephthalate (PET).

The following diagram depicts the key steps in the extrusion blow moulding process. Click to enlarge.
 

 

In the above process, plastic is melted and an injection extrusion process is used to create a small hollow tube called a parison (or pre-form).

The parison is captured and enclosed within a metal mould that contains cooling channels. Clean dry compressed air is blown into the parison inflating it to form the shape of the hollow bottle, container or part. The plastic must be cooled before it can be ejected from the mould. A typical mould can be seen in the picture below:

A critical stage in the extrusion blow moulding process is the cooling phase. The final product is technically frozen inside the mould cavities using cool water flowing through the cooling channels.

Because blow moulding typically uses an injection moulding technique to form the parison, the heat load from the hydraulic circuit powering the press must be removed.

More precise cooling capacity must be delivered to the mould responsible for cooling the finished product prior to ejection. Typical cooling requirements for the mould are as follows:

• Typical water temperature range between 10 – 15°C.
• Temperature Delta approximately 2°C.
• Water pressure maintained around 5 bar.

When calculating the cooling capacity required for the blow mould, the target mould temperature in and quantity of plastic that will be blown per hour must be obtained. The Kcal/hr of heat load that needs to be removed from the mould can then be calculated. For additional sizing information please contact your local Parker specialist.

Why Parker chillers? 

Parker Hyperchill and Hyperchill Plus chillers offer an ideal solution for the plastic industry, providing a one-package solution to meet the different needs of plastic production processes thanks to:

• All-in-one solution including internal water tank, pump and bypass.
• High-pressure pumps are designed to overcome water pressure drops of the mould cooling channels.
• Generous size water tank and oversized condenser and evaporator give the chiller higher flexibility and the ability to operate at high temperature gradients, ensuring reliable and continuous operation of the customer machine.

 

View the interactive tor more detailed information on the importance of accurate temperature control in the printing industry.

This post was contributed by:

James Brown, compressed air and gas treatment/analytical gas sales manager, Parker Gas Separation and Filtration Division EMEA

 

 

 

 

Filippo Turra, product manager, Parker Gas Separation and Filtration Division EMEA
 

 

 

 

 

Related content

Defining Our Unique Contribution to the World

What Is Process Cooling and How Is It Used in Industrial Applications?

The Importance of Process Cooling in the Printing Industry

Why Accurate Temperature Control Is Important in Brewing and Distilling

System Design Guidelines for Your Process Chiller Installation

Process Cooling Accelerates Throughput in Food and Beverage Manufacturing

 

Firefighters have one of the most dangerous and demanding jobs in the public’s eye. They are called upon to face complex fires or natural disasters to save lives or property. Innovative technology to help protect people and property is in high demand from firefighting forces around the world. This demand led Crash Rescue Equipment to team up with Parker’s Cylinder Division to design a telescoping nozzle on fire trucks that allow the nozzle to penetrate composite fibers and be placed inside small door openings or other restricted areas. 

“Our Snozzle is a quick attack tool that can penetrate all current building, aircraft, automobile or train container materials including composite panels. By using Parker’s Helac hydraulic rotary actuator to position our piercing nozzle, we can quickly penetrate and maneuver into tight spaces in a variety of aviation and municipal applications,” stated Grady North, chief engineer for Crash Rescue Equipment. 

Better load management

Before using Parker’s Helac rotary actuator, Crash Rescue Equipment used two electric motors to position the piercing and water volume nozzles on the telescopic booms found on the fire trucks. When the object was pierced, a load was also put on the water volume nozzle, taxing the motors. The result of this overload condition caused the motors to slip and lose positioning control of the piercing nozzle. 

Crash Rescue Equipment changed the overall design of the telescoping boom assembly to overcome this problem. They separated the function of the piercing nozzle from the water volume nozzle and used Parker’s helical, hydraulic rotary actuator to stow and deploy the piercing nozzle through 180 degrees on the telescopic boom. “Because of the inherent (zero-drift) features of a Parker’s Helac rotary actuator, our piercing nozzle could receive higher torque loads and hold side loads during piercing operations,” said North. 

A look inside

It’s the operating technology that makes Parker’s Helac hydraulic rotary actuators unique and offers a powerful combination of features – high torque and moment loads capacities, high angles of rotation and compact configurations. Sliding-spline operating technology replaces multiple components and functions as a rotating device, mounting bracket and bearing, all-in-one. This innovation converts linear piston motion into a powerful shaft rotation. 

Each actuator is composed of two moving parts – the central shaft and piston. Helical spline teeth on the shaft engage matching teeth on the piston’s inside diameter. A second set of helical splines on the piston’s outside diameter mesh with the gear in the housing. When hydraulic pressure is applied to the piston, it moves axially, while the helical gearing causes the piston and shaft to rotate simultaneously. 

Researching the choice

Crash Rescue Equipment looked into several electric positioning alternatives before proceeding with a hydraulic rotary actuator. They wanted to avoid adding hydraulic lines to the internal electrical flex tube if at all feasible. They began their search with electric linear cylinders, yet quickly discovered that the geometry wouldn’t fit the application and that the cylinders also needed a much higher degree of rotation. Additionally, cylinders have external rods and linkages that would increase the maintenance costs associated with particle contamination to the electric circuitry. 

Electric motors were also researched. This possibility failed to offer the torque requirements or mounting strength needed for the piercing nozzle application. The selected rotary actuator provided the engineers with compact configurations, 180° of smooth rotation, and a durable, enclosed envelope without any external moving parts. It also offered torque output to 740,000 inch per pound, even though only 4,200 inch per pound of torque were needed to operate the piercing nozzle. 

The Helac L20-4.5-180° rotary actuator was mounted directly onto the boom. Because of the actuator’s high radial and torque capacity, auxiliary bearings are not needed. All external forces are supported solely by the actuator.  

 

This article was contributed by Jessica Howisey, marketing communications manager and Daniel Morgado, applications engineer, Helac Business Unit, Cylinder Division and was originally published by Pneumatics Tips Fluid Power World Resource 

 

 

 

 

 

 

 

 

 

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