�ǳ�web Knowledgebase - Proportional

SCPV Series Stepper-Controlled Proportional Valve

Rachel Desenberg — Wed, 07 Jul 2021 18:27:56 +0000

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�ǳ�web’s SCPV Series stepper-controlled proportional valve provides phenomenal flow control. In this quick video, �ǳ�web Product Manager Doug Paynter provides an overview and explains four of the valve’s key advantages.

Video filmed at �ǳ�web in Cincinnati, Ohio

VIDEO TRANSCRIPT:

Hi everyone, I’m Doug Paynter, Proportional Product Manager here at �ǳ�web. Today we’re going to discuss �ǳ�web’s SCPV high flow proportional valve and some of the advantages it brings to the table.

The SCPV being a high flow proportional valve brings four different advantages to the table:
1. Ease of system integration
2. Low hysteresis
3. Low power consumption
4. The ability to provide unique flow curves?

Ease of System Integration

The SCPV provides phenomenal proportional flow control made easy when integrating into a PLC. All you need is a 12 to 40 volt unregulated power supply, a bipolar chopper driver or a chip if you decide to design your own drive circuit, and a PLC. Now, �ǳ�web does provide a bipolar chopper driver, the SCPVD-1, which is typically used in the initial testing phases of all applications.

Low Hysteresis

Hysteresis can be a programmer’s nightmare. Virtually all proportional valves that are in the field have some inherent mechanical or magnetic hysteresis. What it means is that each valve is going to have different flow characteristics at the same set point. The SCPV has virtually zero hysteresis. It utilizes a 3-1/2 degree needle that’s being positioned through a 152 thousandths orifice with incremental changes of one thousandths of an inch. This gives very tight control when opening and closing of the SCPV flow path.

Low Power Consumption

Another nice advantage of the SCPV is low power consumption and latching ability. The SCPV utilizes less than 4 watts of power when in transition. Just like a needle valve, the SCPV requires no power when holding a closed, open, or flowing position. No other proportional product on the market actually offers that. Fail-safes can be created, now the natural fail-safe of the SCPV is to fail in the last known position. However, with simple modifications to the PLC you can have a fail-safe to fail fully closed or fail in predetermined positions.

The Ability to Provide Unique Flow Curves

Flow characteristics are an obvious decision factor when trying to choose the proper valve for the application. Here at �ǳ�web, we can change the needle, we can change the taper, we can change the orifice. All these components are manufactured right here at �ǳ�web. Bringing manufacturing versatility to the table allows for the customer engineering team to decide how best to design our product around the application requirements. Designing a product that actually can provide 1,000 l/min or 500 l/min, changing that needle profile is key to the application’s success.No other competitor can boast of high flow, proportional control with low hysteresis, low power consumption and manufacturing versatility for the cost.

Remember, �ǳ�web is known for being a strong partner to OEMs who want to design a solution to their application needs. Give us a call with any questions, and be sure to subscribe to our YouTube channel. I am Doug Paynter, �ǳ�web Product Manager and all-around good guy. Thank you very much for your time.

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Proportional

Precise, Consistent Control Supports Cell Proliferation

Rachel Desenberg — Thu, 25 Mar 2021 18:47:36 +0000

Category:

Applications

Bioreactors are manufactured devices or systems that support biologically active environments. They are essentially vessels in which a chemical process is carried out involving organisms or biochemically active substances derived from organisms. Part of this process is sparging, which is the introduction of air, oxygen, carbon dioxide, and nitrogen to the cell culture media.

Problem:

Obtaining better control of the environment to better optimize cell proliferation

Optimal cell culture growth requires not only precise control, but also consistency. In this case, this bioreactor manufacturer was looking to enhance cell proliferation by improving both of these factors.

.............................................................................

Solution:

DV series valves provide exceptional precision and repeatability

�ǳ�web’s DV series valves were ideal for this application due to the exceptional level of precision, repeatability, and low leak performance they provide. Four DV series valves were selected to be used to control oxygen, air, carbon dioxide, and nitrogen being fed through the bioreactor’s sparger in order to control pH and dissolved oxygen (perfusion media) in the cell culture media during cell cultivation. �ǳ�web also configured a custom manifold to fit the application’s special mounting and porting requirements. The DV series valves enabled better, more precise, more consistent control over the critical parameters impacting cell growth proliferation within the bioreactor.

Pinch valves and proportional controls can also be used to automate the addition of perfusion media to cell culture media in order to optimize the proliferation environment. Additionally, precision proportional pressure controls are well-suited for maintaining the pressure and gas mixture in the headspace of bioreactors.

Related Products
DV Series Precision Electronic Valves	NIV Series Solenoid-Operated PTFE Media Isolation Valves	NPV Series Solenoid-Operated Miniature Pinch Valves	NPP Series Pneumatic Miniature Pinch Valves

Cordis Series Precision Electronic Controls	DR-2 Precision Regulator	EVP Series Proportional Valves	D VP Series Proportional Valves

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How to Achieve Ultra-Fine Proportional Control with �ǳ�web's Patented Eclipse Valve Webinar

Rachel Desenberg — Fri, 12 Mar 2021 19:44:44 +0000

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Videos

�ǳ�web's award-winning Eclipse proportional isolation valve is ideal in critical liquid and gas delivery applications requiring ultra fine resolution and excellent repeatability. It is fully flushable with zero dead volume, features a specially-designed flow path with sweeping transitions, and all wetted areas are inert (ceramic). This makes the Eclipse well-suited for a variety of demanding medical, analytical, and industrial automation applications.

Related Products
Eclipse Proportional Isolation Valve

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EIV

High Precision Fluid Proportional Valve

Rachel Desenberg — Tue, 10 Dec 2019 21:20:13 +0000

Category:

Applications

Applications:

Industrial / Medical Ink Printing
Precision Micro Fluid Mixing
3D Bio Printing
Precision Fluid Transferring
Dosing

Proportional Power Savings

Rachel Desenberg — Tue, 10 Dec 2019 20:45:31 +0000

Category:

Applications

Applications:

Mobile Analytical Equipment
Environmental Testing
Liquid Chromatography
Fuel Cells

DVP High Flow Electronic Proportional Control Valve

Rachel Desenberg — Thu, 27 Jul 2017 18:11:08 +0000

Category:

Product Information

�ǳ�web's next-generation DV Series valve is available in a 2-Way proportional flow control version! The DVP Series provides a high degree of control and customization. Available in manifold mount or #10-32 mounting styles, the DVP provides fast response times and exceptionally long life.

Features:

• Industry standard for leak-free operation
• Over 1,000,000,000 cycles
• Extremely low hysteresis
• Fast response time
• Large flows in a small, sleek design
• Low heat rise/low power
• Robust stainless steel "spider" flat armature spring
• CE, RoHS compliant
• Proudly Made in USA

Valve Type: 2-Way, Proportional
Medium: Air or Compatible Gases (40 micron filter)
Pressure Range: Vac* to 100 psig
Max. Flow Tolerance: +10% / -0%
Power Consumption: 1.9 watts at 72˚F, 2.5 watts max.
Temperature Range: 32 to 120˚F
Voltage: 10 VDC (0.190 amps) or 20 VDC (0.095 amps)
Mounting: Manifold, #10-32 Male Stud
Seal Material: FKM standard; Nitrile, EPDM & Silicone available
Wetted Materials: Stainless Steel, PPS
Certifications: CE, RoHS, REACH

*Vacuum applications are reverse flow

�ǳ�web's DVP series proportional solenoid valves are precision-built 2-way flow control valves, utilizing �ǳ�web's unique valving principle. This powerful series was designed as the next generation of �ǳ�web's best-selling original EV line. With a lifespan of over a billion cycles; a solid, compact design; and extremely high flow rates, these valves are suitable for many applications across numerous industries.

The DVP series provides air or gas flow control and varies the output flow based on the current input to the solenoid. The consistent gain (see chart) of this valve provides a high degree of control.

Controllability and overall value are the main features of the DVP series. The valve may be controlled using DC current, open or closed-loop control, and even PWM (pulse width modulation) to cover a large range of applications.

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High Flow in a Miniature Package: �ǳ�web's DV Series

Rachel Desenberg — Thu, 09 Jun 2016 19:04:54 +0000

Category:

Product Information

�ǳ�web's entry into the miniature electronic valve market began in 1973, when Leonard �ǳ�web, founder, introduced the EV line of valves that utilized only one moving part, the "spider." Today, the EV valve is still serving a very horizontal market with thousands of installed applications in a multitude of industries. Since the initial introduction, several new series have been added to the line, including; Corrosion-Resistant, Oxygen Clean, Analytical, ECN, EVN, ETN, Proportional Control, Intrinsically Safe, EM and ES series, all which utilize the "spider" design. Enter the new DV Valve.

New Design Challenges

According to Dave McBreen, the DV valve project design engineer at �ǳ�web, the all-new design began with the coil. "It's not that we designed the valve around the coil," said Dave, "but we knew our design parameters called for the coil to be less than 2.0 W, so we began there. The 2.0 W would allow us to see what kind of magnetic pull we could generate." McBreen goes on to say that many coils were made in the attempt to optimize one. This led to an optimized solenoid needed for the valve. The process for determining the correct coil was enhanced by a coil calculator. The calculator, which was designed by �ǳ�web's engineering department, greatly reduced the design time and provided the exact specifications of the coil.

Once he had the design criteria, McBreen felt that his biggest challenge was to consider the manufacturing processes needed to get the product out the door—how to get a cost effective, optimized design through manufacturing and yet be fairly simple to assemble was the challenge. Included in this thought process was the concern with size limitations; the valve needed to be small. Yet, he had other criteria to consider, including power, flow, pressure, and materials.

The requirement from the very beginning called for all metal parts to be stainless steel with the nozzle and bobbin utilizing certain plastics that would allow for FDA approval. The all-stainless housing provides many environmental advantages and is manufactured in three Mary Gannon, Design World Senior Editor parts. McBreen is very enthused about the three-part design and just what a "robust package" it delivers. "It can be taken apart and put back together in seconds," said McBreen. One of the main reasons for this is that the valve only has one moving part—the "spider."

The all-new spider, designed from stainless steel, is capable of flows to 100 lpm at 100 psig. Although this is a new spider design, compared to the existing EV line, it is still a poppet valve. With a preload of approximately 0.017 in., stroke up to 0.018 in., and response time of 10-15 msec, the DV Series can be utilized in many applications. And, with the over-molded seal, the DV Series will continue the high standard set by the industry-leading EV line for leak-free operation, which is particularly meaningful for analytical applications.

McBreen also noted that, "in addition to being very economical to produce, the straight-forward, robust design leads to a hassle-free assembly. The new valve has another feature not readily found in other miniature valves: bidirectional flow. It is designed to serve as a dual flow valve within a certain pressure range. Applications requiring this feature should be discussed with �ǳ�web's technical staff prior to installation."

Manufacturing begins

After two years of building prototypes and testing (using FEA stress analysis on the spider and magnetic analysis software for the valve) it is now ready for market, according to McBreen. Initially the product will be offered with an orifice of 0.052 or 0.070 in., with manifold or cartridge style mounts, and voltages in 12 and 24 VDC. Air and other compatible gases are the recommended media with the standard seal but other seals are available for use with other medias. Simply changing the coil, nozzle orifice or mounting options helps to enable special customer applications.

The DV line will be assembled in �ǳ�web's Fairfield, Ohio plant along with the EV line and other Minimatic electronic valves where, according to Steve Schutte, Plant Manager, "all work cells and personnel are prepared for a very positive response to this new product. The ability to produce thousands of valves per week is due in no small part to the straightforward design, which means a straightforward assembly. In addition, an automatic tester is in place which ensures 100% of the valves will go through the testing process." He also noted the testing equipment was designed and built by �ǳ�web.

Application potential

Now that the design and manufacturing processes have been finalized, where will the valve be used? According to Rob �ǳ�web, Vice President Sales & Marketing at �ǳ�web, "one of the key applications will be in the medical field. Although there are numerous applications within the medical industry, none will be more applicable for this valve than blood pressure cuffs. Additionally, applications requiring some sort of pressure monitoring, pulse monitoring of the heart or perhaps oxygen therapy have a great amount of potential. With its high flow capability, respirator applications will definitely be one of the most common uses. Other applications in the medical field would include ventilator and kidney dialysis machines."

While medical will be a primary market, according to Rob, there are many other applications and markets, including gas chromatography, liquid chromatography-mass spectrometry, and other applications requiring analysis. He noted the valves would be used throughout the packaging industry, especially where small banks of manifold mounted valves would be needed.

Future development

So, what's ahead for the DV valve? According to John Campbell, President, "this is one of the new generational valves and we believe it will contribute to the success of the company for a long time. From this basic design we expect to be successful from the start; we'll be growing into many other products as we continue to invest in engineering and continue to believe in new product development as the key to our future."

Original Article, May 2014
By Mary Gannon

Related Products:
DV Series	EV Series

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�ǳ�web EVP Proportional Valves Selection Tips

Rob �ǳ�web — Fri, 03 May 2013 17:27:36 +0000

Category:

Product Tips

How to Select Your
EVP Proportional Valve

Not all configurations are listed online. Please contact �ǳ�web for assistance with product selection.

In selecting your EVP Proportional Flow Control Valve, you have many variables to choose from. Each variable will affect others and this is a simple guide to point you in the right direction. To select the best valve for your application, focus on these three: Control Signal, Valve Orifice and Operating Pressure.

If you can't find the right configuration for you, that doesn't mean we dont have it...
Call �ǳ�web's Tech Team for clarification or help in specifying your valve.

Control Signal:

Everyone understands voltage, however, this valve really cares about current. It works by having a change in current vary the magnetic field, which varies the travel or distance the valve is opening.

Coil Information:
Voltage Range	Nominal Voltage	Nominal Coil Resistance	Max Current
0-5	5	13.5	.370A
0-10	10	54	.185A
0-20	20	218	.093A

Don't forget... �ǳ�web manufactures these valves and has the capability to customize your valve!

Contact Us for more information

IT IS IMPORTANT to specify and use a calibrated valve that matches your application. Be sure to use a valve set to your operating pressure to assure you have an all-around good performing valve for your set up.

Otherwise... The required power for opening the valve will be high, and the resolution to set your flow proportional will be poor.

Valve Orifice:

Our Standard Orifice Offering:

Orifice (in)	*Max Flow (l/min)**	P/N Code	Max Pressure (psig)
0.009	2.7 +/- 10%	09	100 psig
0.013	6.7 +/- 10%	13	100 psig
0.025	22.0 +/- 10%	25	100 psig
0.040	18.7 +/- 10%	40	50 psig
0.060	14.0 +/- 10%	60	25 psig

*Measured at Max Pressure

Operating Pressure:

The EVP Proportional Flow Control Valve can be calibrated for pressures less than the maximum pressure shown above. Lower pressures may be substituted in increments of 5 psig, and will be used for calibration. For pressures less than 10 psig, please consult �ǳ�web's Tech Team.

Ready to Order?
Configure Your EVP Valve or Locate a Distributor

Need more help?
Contact �ǳ�web for Assistance

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Proportional

�ǳ�web Stepper-Controlled Proportional Valve

Rob �ǳ�web — Wed, 11 Jan 2012 19:13:54 +0000

Category:

Product Information


The SCPV Series Valve High Flow Proportional Valve The SCPV incorporates the industries most robust and powerful stepper powered linear actuator. This actuator is used to control �ǳ�web’s proven needle valve technology. Imagine the control of a needle valve with an ultra fine thread. It is smooth, proportional, accurate, and stays in the position you leave it. Now, couple that with a stepper motor that gives you precision, speed, and is ultimately automated with any bipolar chopper drive you wish to use. Anywhere there is a needle valve that is controlling the flow of gas, can now be remotely located, automated, monitored and automatically adjusted to meet what ever demand you have in your application.
This product answers the need for a reasonably priced - high flow proportional flow control that comes with some great advantages. Four of the main advantages of this new product are; System Integration, Very Low Hysteresis, Low Power consumption, & Specific Flow Curve cababilities exceeding 500 LPM.
	Simplicity of integrating to a PLC All that is needed is a 12-40 VDC unregulated power supply, a bipolar chopper drive (or chip if designing your own drive circuit) and a PLC. �ǳ�web also offers a variety of boards and resources for boards to control this valve.
View pdf File View Design Engineer's Comments View Ordering Information

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