�ǳ�web Knowledgebase - EVP

Products That Provide Proportional Control of Vacuum

Rachel Desenberg — Fri, 25 Feb 2022 20:28:13 +0000

Category:

Learn more about some of the different options available for electronically controlling vacuum in this quick video from Doug Paynter, �ǳ�web's Proportional Product Manager.

Video filmed at �ǳ�web in Cincinnati, Ohio

VIDEO TRANSCRIPT:

I am Doug Paynter, Proportional Product Manager here at �ǳ�web. Today we want to talk about electronically controlling vacuum. Here at �ǳ�web, we have the ability to provide all types of levels of products that help you control vacuum. Valves can be tested and shipped with as little a leak rate at
10^-11 utilizing our clean room helium gas detector system.

Now let’s talk about �ǳ�web’s EVP and DVP proportional valves. The more current that I apply to the valve, the more of an orifice I create. So I’m able to vary the amount of flow I let into the chamber or let out of the chamber.

We also offer our unique stepper-driven proportional valves that work with vacuum very well. The Eclipse, being designed with low-flow applications in mind, utilizes a ceramic material as the wetted parts. And so, very inert, and you can run different types of hostile gasses or fluids through it. And if you need higher flows, we offer the SCPV stepper-controlled needle valve. Both of them provide significantly higher resolution and work very well with vacuum.

For closing the loop, �ǳ�web can take a vacuum sensor and work with a comparative circuit to give you closed loop vacuum control. With the Cordis, we utilize an onboard micro controller, a specific transducer that we can interface with, whether it’s pressure or flow, and our own EVP, DVP proportional valves. The Cordis can now provide you accurate, repeatable, high resolution control of your Venturi circuit, direct vacuum, or your vacuum break applications utilizing either a digital or analog command.

The Cordis pressure controller can now be calibrated to pretty much any calibration within the application of vacuum control to whatever the application really calls for. Whether it’s in millibar or torr, or inches of water column, inches of mercury, negative to positive pressure or differential, or simply absolute pressure calibrations, the Cordis can now provide you closed loop control of your vacuum circuit.

For more information on how �ǳ�web can help you better control your vacuum applications, give us a call. Be sure to subscribe to our YouTube channel so you can see more riveting videos like this one. Thank you.

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EVP

DVP

SCPV

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CPC

The Proportional Valves at the Heart of �ǳ�web's Cordis Series Electronic Pressure Controller

Rachel Desenberg — Fri, 09 Apr 2021 18:50:07 +0000

Category:

Videos

What's inside your pressure controller? Check out this quick video to learn more about the proportional valves that help make �ǳ�web's Cordis series electronic pressure controls so unique.

Video filmed at �ǳ�web in Cincinnati, Ohio

VIDEO TRANSCRIPT:

Hi everybody, I’m Doug Paynter, Cordis Product Manager here at �ǳ�web. Today, I want to talk to you about the EVP and DVP series proportional valves that we manufacture and utilize internally to the Cordis CPC series proportional regulators. The CPC series is a very unique electronic pressure regulator. Not only does it have an onboard microcontroller and it has a host of different pressure sensors to work with, but it also incorporates our own manufactured EVP and DVP series proportional valves.

The EVP series, better known as the purple cap valve, has been utilized in countless applications around the world for years. It is a very reliable valve that has been utilized in small flow, whether it’s static or dynamic applications, any application where my critical volume is going to be sub 1 cubic inch, I need to be able to do finite pressure control in, it’s the ideal valve.

Now, when I need more flow, I’m going to go with the DVP series valve which was designed to provide more flow in a proportional condition.

The best part about this whole thing is that we manufacture everything. We manufacture the CPC series product. We also manufacture both proportional valves. This gives �ǳ�web the ability to be very versatile in what we provide you as a proportional regulator. We can provide specific calibrations, custom configurations, quick turnarounds—the possibilities are endless because we control what we’re providing you.

This is a great product for your applications. As I said, it’s a high resolution proportional regulator utilizing our own manufactured proportional valves. If you have any questions with what I’ve just said, give us a call. I’m Doug Paynter, Cordis Product Manager. Thanks for watching and please subscribe to our YouTube channel for more videos.

Related Products
CPC Series Electronic Pressure Controls	EVP Series Proportional Valve	DVP Series Proportional Valve

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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EVPD Proportional Valve Driver I/O Manual

Rachel Desenberg — Sat, 20 Mar 2021 15:34:37 +0000

Category:

Installation Instructions

EVPD Proportional Valve Driver IO Manual

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EVP

EVPD

Pneumatic Solutions for Oxygen Mixing & Blending

Rachel Desenberg — Mon, 24 Nov 2014 20:03:46 +0000

Category:

Applications

The terms mixers, blenders and proportioners are synonymous when it comes to mixing two gases. Mixers are used in many applications across many industries; medical, welding, heat treating and food packaging to name a few. In the medical industry, O2 mixers are use to mix oxygen with other gases, including ambient air, for patient treatment. The mixers allow the doctor to go from a mixture of oxygen, typically from 21% to 100%. Most manufacturers are accomplishing this with modified needle valves that they manufacture.

easy replacement
needle valves

�ǳ�web has been manufacturing and supplying needle valves for a wide variety of applications for over 50 years. We now offer a cartridge style needle valve—the GNV Series—that is especially well-suited for these types of mixing applications. The standard GNV stem will allow knobs to be put onto the end, and added mounting features make it an easy replacement in most situations.

Need help incorporating a �ǳ�web needle into your product? Since we're the manufacturer, modifications are no problem.

proportional control for advanced mixing

For more advanced mixing, �ǳ�web offers two electronic proportional valves. The EVP Series is a #10-32 ported valve and is small in size. The EVP provides air or gas flow control and varies the output flow based on the current input to the solenoid. The consistent gain of the valve provides a high degree of control for mixing applications. The typical flow capabilities for this valve are 0 bubble tight to a maximum flow of about 23 l/min, based on pressures up to 100 psig.

Controllability and overall value are the main features of the EVP Proportional Series valves. The EVP Proportional valve may be controlled by using DC current, open or closed-loop control and even PWM (pulse with modulation).

For higher flow applications we have developed an innovative stepper-controlled needle valve, the SCPV Series. The flow of this valve is again 0 bubble tight to 300 l/min based on 100 psig inlet pressure. The flow resolution is 0.56 slpm per step, with a position resolution of 0.001 per step.

Contact �ǳ�web
Locate a Distributor
Download Whitepaper (PDF)

For more advanced mixing and blending applications that require media isolation,
check out the Eclipse proportional isolation valve.

Relevant Product Lines:
GNV Series	EV Series	EVP Series	SCPV Series

Toggle Valves	Flow Controls	Eclipse Proportional Isolation Valve

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EVP

SCPV

eclipse

�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.