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ITT Pure-Flo Block Body Diaphragm Valves: ZSBT vs ZSBBT- What’s the Difference?

October 28, 2014

ITT Pure-Flo Zero Static Valve Body with Sampling Port

Even at Holland, where we’re all sanitary process experts, occasionally we can get confused. One issue that came up recently is the difference between ITT Pure-Flo’s ZSBT and ZSBBT valve. We’re going to take this post to review the functionality of a zero static point of use diaphragm  valve and clarify the difference between the ZSBT and ZSBBT zero static valve.

To begin, zero static use points are some of the most critical valves used in the biopharmaceutical industry. A point of use valve allows fluids to be transferred, sampled, drained, or diverted. Zero static valves help us comply with ASME BPE’s L/D dead leg requirements of 2:1. A dead leg is basically a one way water system. Dead legs result in process system that are difficult to clean. Stagnant fluid can also harbor process compromising bacteria.

While the FDA had historically required dead legs not to exceed 6 diameters of unused pipe, the BPE, finding this rule not sufficient to assure sterility, imposed even more stringent requirements. In 1997 the ASME addressed these problems by strongly suggesting (stopping just short of mandating) that the length of a dead leg shall not exceed two times the pipe diameter.

With these stringent requirements, you can see why putting a valve on the branch of a tee could be problematic. As a response to this requirement, the zero static point of use valve has been widely adopted throughout the pharmaceutical process industry. A zero static point of use valve incorporates the outlet valve weir into the main run. Fluid can then be drawn off the main line in a much “cleaner” fashion.

Several variations of the standard zero static diaphragm  valve have also developed, including the zero static sample valve and zero static valve with downstream purge. These block body valves incorporate an integral valve onto the back of the valve assembly that provides access either to fluid upstream of the valve weir (Sample), or access to the process downstream of main valve weir (purge). These integral valve assemblies greatly reduce contact surfaces, hold up volume, and possible dead legs.

So now that we know what a zero static valve does, what is the difference between the ZSBT and ZSBBT valve? The answer is shockingly simple- not much. When ITT originally debuted the ZSBBT valve, they used a faceted body that helped in situations with tight space constraints.

Over time, the market started asking for a more economical zero static valve that could be used in applications without space concerns. To answer this, ITT debuted the ZSBT non-faceted zero static tee. This valve has a squared block body that requires fewer machining steps to make. All other critical dimensions are identical between the ZSBT and ZSBBT valves. All MOC’s and actuation options are the same as well. The only difference are the aesthetics.

So there you have it- the mystery of the ZSBT solved. So the next time you’re looking to replace a legacy ZSBBT valve and you get a quote for a ZSBT, rest assured you are getting a drop in replacement for your legacy valve. For any additional questions about your next sanitary diaphragm valve application, contact a Holland Sales Engineer today.

Which C Series Pump do I have? Finding Replacement Parts for your C Series Pump

October 16, 2014
The C Series Pumps has been a Workhorse in the Sanitary Process Industry for Years

The C Series Pumps has been a Workhorse in the Sanitary Process Industry for Years

Today we’re going to take a look at one of the longest tenured sanitary pumps- the C Series pump. While previous posts on centrifugal pumps have focused on the technical advantages of the Waukesha 200 series and the APV W+ series, this post will take a step back in time and look and one of the legacy pumps of our industry- the C series. Because they’ve been around for so long, this post will take a look at a trick to identify your old C series, as well as a few other ways Holland can help support your aftermarket pump needs.

As a workhorse of many sanitary applications, it’s not uncommon to find a C series pump in service that has taken quite a beating. Often times, casings have been changed, serial numbers have vanished or been misplaced, personnel has changed, and there is little that can be done to identify an old C series pump. Is it a C114? A C216? How can you tell? Well one trick you can use if you don’t have any discernable model information is to measure the backplate. A C114 will have a 4” backplate. A C216 will have a 6” backplate. And can you guess what a C218/328 will have? That’s right, an 8” backplate.

Once you figured out what model you have, identifying spares is easy. You’ll just need to identify the elastomers (how to do that was the subject of a previous post), and figure out your seal materials. Most of the time, a description of the application will be enough to get you into the correct seal parts.

So now that you know what model you have, how do you go about getting parts? Well, regardless of whether you have a Triclover, Ampco, Topline, or Alfa Laval, Holland can supply you with replacement parts. Holland provides genuine Waukesha parts, picked up twice weekly at SPX’s Delevan facility, which are interchangeable with other manufacturers C series pumps. You read that correctly- even if you have an old Tri Clover C114, you can call us up and we will work with you to identify the correct parts.  You can also download C Series parts lists as well as parts lists for all of the other Waukesha pumps we handle on our website.

And while the C series of pump has a simple, elegant design, Holland does offer pump repair for all manufacturers’ C series pump. Our trained technicians work exclusively on sanitary pumps and valves and can turn most repairs around in a couple of days. Best of all, pump evaluation is free. We’ll quickly be able to provide you with actionable information you can use to determine if you want to repair or replace your pump.

So the next time you have trouble identifying or sourcing parts for your C series pump, measure the backplate or call us and we’ll walk you through it. Once we’ve identified the pump, Holland can support all of your aftermarket C series pump needs. If you have any additional questions about any of your sanitary pumps, contact a Holland Sales Engineer today. We’re the one stop shop for all of your sanitary process needs.

Pharmaceutical Filling Needles- Passivation, Ultrasonic Cleaning, and other Cleaning Considerations

October 9, 2014

One area of pharmaceutical processing that we’ve been spending an increasing amount of time at Holland is the world of final product fill and finish. Our last post focused on vial and syringe filling technologies commonplace throughout the industry. Today we’ll be take another look at the fill needle itself and cleaning considerations following manufacture- specifically, ultrasonic passivation.

To begin, ultrasonic cleaning is a process that uses ultrasound and an appropriate cleaning solvent to clean items. Ultrasonic cleaners are fitted with transducers attached to the bottom of the cleaning tank that create vibrations at high frequencies- measured in thousands of cycles (kHz)- and send sound waves through the cleaning solution. The waves create millions of cavitation bubbles that implode on the surface of the material. This cavitation effect lifts contaminants off of the objects being cleaned.

As a corollary to this, passivation, which we’ve touched on before, is used in a wide range of industries to remove free iron by beefing up the passive, chrome oxide layer of stainless steel. Passivation processes in the pharmaceutical industry are generally regulated by the ASTM, specifically ASTM guideline ASTM A 967. The most common type of passivation used throughout the biotech industry is citric acid passivation because it is a low hazard cleaning agent and is biodegradable. Common steps in all passivation procedures include cleaning prior to passivation, submergence in a hot acid bath for approximately 20-30 minutes, followed by a water rinse and drying.

This begs the question- how do you clean both the inside and outside of something as small as a needle cannula? The answer we’ve arrived at is a multistep ultrasonic cleaning process that we feel is most effective in removing free iron and other surface contaminates present in fill needles following manufacture, while protecting the needle design and ensuring superior performance.

As previously mentioned, Holland has been doing citric acid passivation in house for quite some time. We’ve found that applying ultrasonic energy to the process offers two key advantages in the processing of small ID components- speed and thoroughness. The minute bubbles generated by the ultrasonic bath work on all surfaces and are particularly effective at penetrating the small ID’s of fill needles. This allows us to clean both the inside and the outside of the needle in a matter of minutes.

A typical three step ultrasonic needle passivation process starts with the parts being lowered into an ultrasonic citric acid bath. Both temperature and pH of the bath are closely monitored. The cleaning solution and cavitation created by the ultrasonic bath greatly increase the ability to clean both the inside AND the outside of the needle. Once the appropriate temperature and pH have been reached, the parts are placed into the bath for a specified period of time- usually about 20-30 minutes.

At the end of this time period, the parts are removed from the acid bath and placed into a second ultrasonic bath for an ultrasonic water rinse. This step helps remove any contaminants the citric acid pulled out- again on both the ID and OD of the needle.

The final step consists of a final water rinse without any cavitation. Fresh water flows across the parts, removing final contaminants prior to air drying.

So there you have it- a simple, three step process that ensures your filling needle is as clean as all of the other stainless in your facility. At Holland, we’ve been working with passivated stainless steel parts for over 60 years. We’ve been able to leverage that experience to develop robust solutions that assure our customers they receive only the highest quality product because at Holland, we understand that the process is the product. If you have any questions about your next pharmaceutical filling needle application, contact a Holland Sales Engineer today.

Vial and Syringe Filling in the BioTech and Pharmaceutical Industries

September 29, 2014

At Holland, one particular area of the biotechnology industry has becoming increasingly interesting to us is final product fill and finish. We’ve found that many of our core competencies have prepared us to help end users and equipment providers deal with the challenges associated with getting final drug product in a jar. As the pharmaceutical industry continues to evolve, increasing pressure is being been placed on filling machine providers by end users to focus on improving the flexibility, reliability, and efficiency of the filling process. This post will take a look at the most common types of pharmaceutical filling equipment and recent trends that are interesting to us.

Rotary Piston Pumps

While pharmaceutical companies are driving vendors towards single use, disposable dosing systems- systems where the entire fluid path is discarded- the most commonly used filling mechanism used today is still the rotary piston pump. Rotary piston filling machines use a matched set of piston and cylinder to dispense precise volumes of liquid. These machines are suitable for a wide range of viscosities, temperatures, and fill volumes. They work well with a variety of challenging products including shear sensitive or low surface tension products. While this has historically been the most popular type of filling machine, drawbacks include the need to disassemble and clean the machine after each use. CIP/SIP of piston pumps can be problematic and they are not offered with completely disposable flow paths.

Rolling Diaphragm Pumps

This type of filling machine is essentially a variant of a piston pump. These systems use a diaphragm to push and pull product in and out of the machine. While historically also stainless steel, recently technological breakthroughs, such as Dover’s Quattroflow quaternary diaphragm pump, have allowed for the use of polycarbonate pump heads and disposable needles, allowing for a fully consumable flow path.

Peristaltic Pump Systems

While originally used for fluid transfer, rather than high speed, accurate dosing, recent advance in servo-drive controls have given machine suppliers the ability to control the motion and position of the peristaltic pump rollers and have integrated feedback from the machines check weighing system. The key advantage to this technology is that it offers complete disposability, with almost no chance from product cross contamination. Limitations of this technology include limited viscosity range, tubing spallation, and somewhat low precision compared to other technologies.


These systems incorporate a pressurized product tank and pinch valves to open and close silicone tubing between the bulk tank and filling needle. In these systems, it is critical to control and monitor tank headspace pressure and overall system conditions. That being said, recent advances in the ability to control the aforementioned has allowed time/pressure systems to become just as accurate as pump systems in some cases. Other big pluses to time/pressure applications are very low shear and compatibility with CIP/SIP.

Drawbacks to time/pressure systems can include inaccuracies due to variation of vessel head space, no disposable flow paths, and an increased amount of time to tune in and start a fill for a process that can be affected by temperature or other factors affecting fluid flow properties.


The last type of machine we’ll touch on are mass-flow fill systems. These use mass as opposed to volume dispensing via the Coriolis effected. The Coriolis Effect occurs when fluid passes through a vibrating sensor tube. These tubes, which constitute a Coriolis meter will then communicate with a valve controlling discharge through the machines needles. Mass flow dispensing is the type we see least often, due to viscosity and accuracy limitations, with applications primarily limited to opthamalic product fills.

To conclude, substantial progress has been made toward improving the accuracy and control of the filling process. Increasingly robust technology has enabled rapid changed over and flexible lines that allow users to be responsive to changing customer demands. Holland is proud to offer both stainless and single use solutions, including needles, tanks, pumps, and manifolds (all in both stainless and disposable) to help our customers with their unique filling challenges. For more information about your next fill/finish application, contact a Holland Sales Engineer today.

EnviZion- ITT’s Newest Sanitary Diaphragm Valve

September 17, 2014

Exciting things are going on in the pharmaceutical process world. Holland has spent the last week in Lancaster, Pennsylvania learning all about the latest and greatest in diaphragm valve technology- ITT‘s new EnviZion hygienic valve platform. This breakthrough technology features an all new valve body, diaphragm technology, and tool-less top works that will set a new standard for critical process applications where excellent cleanability and seal ability are not just necessary, but essential. This post will focus on just a few highlights of the new valve platform and what these features mean to end users.

The ITT Pureflo Envizion Sanitary Diaphragm Valve

The ITT Pureflo Envizion Sanitary Diaphragm Valve

Let’s start by looking at the most striking new feature of the EnviZion sanitary valve- the radically new tool-less top works.  The bonnet for all EnviZion valves are mounted to the valve body with a simple twist and secured with a few turns of a locking cover.  The rest of the “tools” needed for assembly are all within the bonnet itself.   This simple assembly process also engages the most innovative feature of the EnviZion valve platform.  A thermal compensation system that ensures a 360 degree active seal at all times – even following SIP.

So what does this mean for end users? Well, first and foremost, it means the valve does not need to be retorqued following an SIP cycle. Let me repeat myself: NO MORE RETORQUING. What else does this mean? It means we’re going to eliminate a tremendous amount of downtime and almost eliminate the possibility of losing a batch of valuable product due to a valve leak because the Teflon diaphragm creeped. By minimizing downtime, we maximize uptime, effectively increasing the capacity of the system. This is key in the highly competitive BioPharmaceutical market where capital costs and building design need to be allocated as efficiently as possible. These two features- decreased chance of leakage and increased productivity- make the valves extremely economic when viewed from a total cost of ownership perspective.

What else does this tool-less bonnet design mean? I’ll give you a hint- it’s another “E” word- ergonomic. It means no more tools, nuts, or screws in classified product spaced. The EnviZion valve makes it quick and easy to change out diaphragms in hard to reach places. Changing diaphragms is in fact so quick and easy now that end users may be able to consider bringing diaphragm change out in house, instead of relying on outside contractors.

Continually, by eliminating tools, we eliminate the need for some of them in our clean room. Diaphragm valves are commonplace in clean rooms and other classified areas. By eliminating the need for torque wrenches and fasteners, we eliminate one more thing that can compromise the area- another big expense.

ITT Pure Flo Envizion Valve with a Pneumatic Actuator

ITT Pure Flo Envizion Valve with a Pneumatic Actuator

So this new technology is great, but what does it mean for existing processes? Fortunately, the EnviZion sanitary diaphragm valve platform uses BPE standard over all lengths, making retrofit and replacement of current problem valves a breeze. Overall, valve footprint of the EnviZion is very comparable to existing valves. The EnviZion platform is available now in sizes 1/2″-1″, with the 1.5″ and 2″ version coming online in the near future. All standard block bodies, including sterile access, GMP, zero dead leg, and ISG configurations are available. Both manual and pneumatic actuators are available, as well as industry standard automation and controls packages. The EnviZion platform will also utilize the same materials of construction, including the diaphragm materials, used in ITT’s current line of Pure-Flo valve, which should help ease compatibility and validation concerns.

To conclude, the new EnviZion sanitary diaphragm valve platform is an exciting, new technology that builds on the decades-old, tried-and-true diaphragm valve technology. With this valve, ITT is able to offer a product that expands on the success of it’s Pure-Flo product line and provide an innovative solution to common process headaches. The EnviZion valve gives users another tool to increase profitability and assure product purity. Aside from the top works, there are some other key features to the valve, including body and diaphragm design that will be the focus of future posts. For more information about the all-new EnviZion valve, contact a Holland Sales Engineer

Pharmaceutical Filling Needles: How to Reduce Dripping and Solve Other Common Problems

September 4, 2014

A tremendous amount of this blog has focused on how we can optimize a process to get a product to the final filling stage, but little of the information available to consumers today focuses on the specific challenges that can occur during the final fill process. Specifically, we’re referring to the lack of information available about filling needle design. Whether you’re filling a vial or a bottle, each product and application is unique. For many applications, a blunt needle tip will suffice. But for more challenging products, we may need to revisit the needle geometry. This post will highlight some common challenges during filling, needle tip geometries, and the problems they address.

To begin, why is needle tip geometry so important? Let us explain. In final fill applications, our goal is to fill both accurately and quickly. We also want to minimize product loss and ensure final product sterility and viability. In order to achieve these goals, we want to avoid foaming of product in the vial or dripping through the needle. Product characteristics such as density, polarity, and surface tension all greatly impact the ease of filling a product. Other products may not be compatible with steel or may be oxygen sensitive. Selecting the right tip geometry can be as much art as science, so let’s look at a few of these properties and needle tips styles we can use to make our lives easier.

Example of Blunt, Straight-End Tip Filling Needles

Example of Blunt, Straight-End Tip Filling Needles

Let’s start by looking at the most common needle geometry- the blunt, straight-end tip. Blunt needles are the “standard” needle type provided by most machine OEMs. The blunt needle will dispense liquid directly into the bottom of a container. Problems that are likely to occur with blunt tip needles can include dripping, foaming, and wicking- particularly with hydrophobic and low surface tension products.

One tip geometry we can use to combat this is the basket tip type needle. These are used in applications where foaming and dripping occur, usually because a blunt tip needle can’t support the fluid column (even when the tubing is properly occluded). A basket tip needle has a larger combined surface area for fluid to exit, reducing the flow rate, but better supporting the fluid column. The basket design directs fluid towards the sides of the container, allowing soapy or foamy products to cascade down the sides of the container like a waterfall without foaming or splashing.

Building on this design, a showerhead type needle will also help with foaming, dripping, and high density hydrophobic products. Showerhead needles are especially helpful with larger fill volumes and usually not feasible with smaller needles. Showerhead needles work by directing product flow in as many as six individual streams. In high volume fills, this greatly reduces the fill times of foamy or soapy products, allowing operators to run product pumps at full speed without issue.

While hydrophobic, oil based products tend to run through the needle head, some products will actually adhere or wick to the needle tip. To combat this, Teflon coated or even solid PEEK needles can be used. Teflon is known for being incredibly slick and won’t interact with a hydrophilic solution. An FEP coated needle effectively strips away extra liquid before it can accumulate in the needle head, throwing off fill volumes.

A final filling challenge we’d like to highlight is metal sensitive products. Specifically, halogen based and high salt content products. Halogens are notorious for attacking and destroying even passivated stainless steel. This is a problem for obvious reasons. To combat this, a variety of halogen resistant coatings can be used to product the steel needle stock. By eliminating halogen related corrosion, we maximize needle life and mitigate corrosion associated risk.

To conclude, final fill and finish is often as much of an art as it is a science. While there is plenty of information available about all of the steps leading up to the needle, very little attention has been paid to optimizing the filling needle design itself. If you have questions about your pharmaceutical filling needle, contact a Holland Sales Engineer today.

The Effect of Slip on Sanitary Pump Performance

August 26, 2014

This post will touch on a topic we’ve discussed a few times in the past- the low slip design the Waukesha Universal series of sanitary positive displacement pumps. Previous posts have talked about how the external circumferential piston design of the Waukesha Universal series makes it nearly perfectly positive and efficient at viscosities over about 250 cps, but why is this important? Outside of efficiency, the low slip design of the Universal series pump allows us to accomplish four useful things- it allows us to pump low viscosity fluids in low NIPA systems, it allows us to pump from vacuum vessels, self-prime, and meter fluids. This post will look at each of these four benefits and why they are important to system performance.

Waukesha Univeral Pumps can be Run at Slow Speeds, Minimizing Shear

Waukesha’s Unique ECP Rotor is More Efficient than Lobe or Bi-wing Designs, Resulting in Less Slip

To begin, the low slip design of the Waukesha Universal series of pumps allows us to efficiently pump low viscosity fluids when net inlet pressure available (NIPA) is also low. When pumping low viscosity fluids in low NIPA systems, slip can greatly reduce pump capacity and increase energy requirements. At low pump speeds this generally isn’t an issue, but if pressure differential across the pump causes excessive slip, little or no flow may result. At higher speeds, internal pump losses may be high enough to limit flow. In a high slip, low efficiency pump design, high velocities of fluids within the chamber can create localized areas of low pressure. If this pressure drops below the vapor pressure of the fluid being pumped, flashing can occur and vapor will fill the pump cavities, destroying the ability to sustain uniform flow.

The next thing the low slip design of Waukesha pumps allows us to do is pump out of a vacuum vessel. Pumping from a vacuum vessel is an example of an extremely low inlet pressure system. Vacuum chambers are typically used to evaporate fluids to hold and process liquids at extremely low temperature. This means we’re going to be operating at or near the fluids vapor pressure in these applications. Because of this, we need to use a pump that is as efficient as possible to allow us to run the pump as slowly as possible. High speeds will create an area of low pressure at the inlet of the pump which can lead to flashing and cavitation, crushing system efficiency and greatly reducing pump life.

As we’ve talked about in previous posts, the clearances in Waukesha pumps are so tight that at higher speeds the pump can even move air. What that means is that the pump can be used to dry prime or actually evacuate the air in the inlet line, reducing pressure, and drawing fluid up the line and into the pump chamber where normal pumping can begin. While not suggested, Waukesha PD pumps can run dry long enough to draw fluid into the pump chamber and begin standard processing. Care should always be taken to ensure the maximum available pressure at the inlet of the pump. Contact a Holland sales engineer for help determining the amount of lift your Waukesha pump can generate.

A low slip Waukesha pump can also be used to meter fluids. If the slip is low, a pump will deliver nearly its theoretical displacement in each revolution. By counting or controlling the revolutions per minute of the pump, we can measure the amount of liquid displaced. In any metering application, it’s important to operate in the metering range of the pump- i.e. the range at which the relationship between change in speed and displacement is linear. System conditions should also be kept constant. We want to maintain constant suction head and minimize the pressure differential across the pump. By coupling this with the efficient design of a Waukesha Universal pump, we can reduce the effect of slip and meter effectively.

To conclude, the low slip design of Waukesha Sanitary PD pumps has further reaching implications than just increasing system efficiency. The low slip design of the Waukesha Universal series of pumps allows us to pump low viscosity fluids with low inlet pressures, it allows us to pump out of vacuum vessels, it allows us to dry prime, and it allows us to meter. If you have more questions about your next Waukesha pump application, contact a Holland Sales Engineer today.


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