�ǳ�web Knowledgebase - EIV

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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�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.

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Eclipse Proportional Isolation Valve

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Issuance of U.S. Patent for the New Eclipse Proportional Isolation Valve

Chris Agricola — Mon, 21 Dec 2020 15:35:28 +0000

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Product Information

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�ǳ�web Announces Issuance of U.S. Patent for New Eclipse Proportional Isolation Valves

CINCINNATI, OHIO—January, 2021—�ǳ�web Instrument Laboratory, Inc., a manufacturer of Precision Flow Control products with focus in the medical, analytical, liquid/gas delivery, laboratory and industrial automation markets, announces that the United State Patent and Trademark Office (USPTO) has issued Patent No. 10,738,904 to �ǳ�web's new Eclipse Proportional Isolation Valve. The Patent, "Flow Control Valve Using Ceramic Valve Members", will expire in 2040.

The Eclipse is ideal in critical applications for liquid and gas delivery, medical, analytical and industrial automation requiring ultra-fine resolution and excellent repeatability. In addition, the unique design allows for custom flow profiles.

Patented ceramic sliding seal
Liquid and air capable
Leak free (<0.05 sccm)
Cycle life of typically >1 million
Repeatability: <0.5% of full travel
Highly customizable
Excellent Linearity: <4% of full-scale
Proudly made in the USA

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Eclipse 2-Way Proportional Isolation Valves FAQ

Chris Agricola — Wed, 16 Oct 2019 14:27:49 +0000

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Product Information

What motor is used to control the valve?

NEMA size 8 Bipolar Hybrid Stepper Motor

Motor Specifications
Wiring: Bipolar
Step Angle: 1.8"
Winding Voltage: 2.5 VDS
Current/Phase: 0.49 Arms
Resistance/Phase: 5.1 Ohms
Inductance/Phase: 1.5 mH
Power Input: 2.45 Watts
Protor Inertia: 1.4 gcm2
Linear Travel/Step (resolution): 0.00006" (0.015 mm)

How long is the motor's wiring?

12" (304.8 mm)

What is the suggested method to control the motor?

A controller such as a PLC or microcontroller in conjunction with a bipolar chopper driver such as �ǳ�web's SCPVD-1 Stepper-Controlled Proportional Valve Driver. See SCPVD-1 Installation and Operations Manual.

What voltage should be applied to the motor?

The motor should always be powered using a stepper motor driver with a supply of 20 VDC, however 24 VDC can be utilized instead.

How do I zero the motor?

The valve can be homed by driving the motor clockwise until it reaches the hard stop (audible change). It is recommended to drive the motor at a lower current or voltage during homing procedures. The four-digit number at the end of the serial number is the number of steps from the motor hard-stop to initial flow, or the offset distance. A hard-stop can be reached on either end of the motor shaft, but the offset distance given is relative to the motor hard- stop. Direction of rotation can be determined by looking at the inset shaft on the back of the valve.

Why is the motor not moving as far as expected?

The driver may be set to micro-step. Refer to he Drivers Operations Manual for information regarding micro-step configuration.

What gases or fluids cannot be used in this valve?

Hydrofluoric acid*

* Other highly corrosive acids in high concentrations and
elevated temperatures may affect the ceramic components. Contact
�ǳ�web's Technical Sales Team with questions.

What is the rcommended way to clear or clean the valve?

Move to fully-open position and flush with water or detergent.

Which port is the inlet?

The Eclipse is bi-directional, however the calibration curve is recorded using the port closest to the motor (Port B) as the supply. Please note there are slightly different flow characteristics depending on which way the valve is operated. Contact �ǳ�web's Technical Sales Team with questions.

What hardware is included with the valve?

Two captured 18-8 stainless steel socket head screws, M.5 x 0.45 mm, 6 mm long, to secure the valve to an adapter or manifold.

What size Allen wrench is needed for the mounting screws?

2 mm

What adapters or fasteners are recomended for the valve's ports?

The zero dead volume model (P/N: EIVU-Z) comes with a ZDVF adapter which has 1/4-28 UNF ports for two flangeless headless fittings. �ǳ�web recommends a nut/ferrule combination from IDEX (P/N: XP-283X).

Note: The fittings must be flangeless, meaning the tubing does not flare on the end. Also, "Flangeless" style and "Super Flangeless" styles from IDEX are not interchangeable. The ports are 0.3125" apart so clearance necessary for installation and tightening/looseneing must be accounted for.

The manifold mount model (P/N: EIVU-M) can be connnected to a gas/fluid line by a custom-made manifold (using the manifold layout below) or by an EIV single-station manifold EUM-01 which has #10-32 UNF ports, or M-EUM-01 which has M5 x 0.8-6H ports.

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Eclipse Proportional Isolation Valve

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3D Printing (Positive Pressure)

Rachel Desenberg — Mon, 31 Jul 2000 13:49:16 +0000

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Applications

Depending on the media used for printing, positive pressure can be used to dispense fluid to a 3D printer. This drawing shows �ǳ�web's Cordis controlling compressed air above the print fluid, then the rate of flow is varied and controlled from �ǳ�web's Eclipse to the print head. This process is under constant flow and therefore requires very stable and repeatable pressure control to maintain consistent fluid pressure at the inlet of the Eclipse.