SMLD MICRO VALVES

 

SMLD 100 SMLD 300 SMLD 300G PULSE GENERATOR

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PRINCIPLE OF OPERATION

 

SMLD:    SUB - MICRO - LITER - DISPENSING  VALVES

 

Specially developed for the high precision, high speed Dispensation, the SMLD series sub micro liter dispensing valves are used in all Techelan's TEDA type dispensers and are also sold separately.

These valves guarantee the most accurate dispensation down to 20 nl with CVs of <5% with operating frequency exceeding 2000 dispensations per second.

The SMLD type valves and drivers are available from stock.

 

                                                                                      

The SMLD type valves are miniature, high precision, micro-valves fabricated in Switzerland to the highest European standards. They employ Sapphire and Ruby materials to form unique fluid controlling surfaces. These valves are individually QC tested and adjusted to assure the highest accuracy and reproducibility. The reliability of these valves is expected to exceed 100,000,000 dispensations under normal dispensing conditions.

A sapphire valve seat with the ruby ball (hard on hard surface interface) assures a well-defined, precise dispensation with minimal adhesion, retention and accumulation of reagents. The valve orifice is specially designed to reduce flow turbulence and eliminate formation of satellite droplets, adding to the overall accuracy of the dispensing process. Micro valve dimensions enable their use in tight linear or matrix arrays. An example of 8 x 12 matrix on a standard Micro-titer plate format (3.4" x 5") with 9 mm spacing using SMLD 100 valve is shown on the right-bottom sketch.

It is highly recommended to pre-filter (20-50um) any material upstream of the micro-valve to minimize clogging.

The general layout of the SMLD 100 type valve is presented below

 

 

 

Dispensing stream

Video Clip

(Click to Start/Enlarge)

 The SMLD 300 type valves are featuring a unique modular construction, where the fluid valve can be separated (extracted from) the holding shell and/or activating coil, which serves as a holding shell.  This provides a convenient option for an immediate "on the fly" valve replacement and service.

  Both SMLD 100 and SMLD 300 valves can be assembled into linear 4.5MM center to center arrays.  Valves can have both barbed or straight tube intake connection for the fluidic interface.

  Optional terminating attachments enable valves to be interfaced with various fluidic systems or to be positioned "in-line".

  Special holding fixtures enable an easy positioning, holding or replacement of valves.

 

OPTIONS and APPLICATIONS:

 

8 x 4

Dispensing

Block

 

Valves are activated by a short 12 to 24 VDC pulse (0.14 to 0.09 msec), followed by a 3 VDC (RMS) holding voltage (See Drivers). Valves closure is partially dependent on liquid viscosity and pressure and can take up to 0.15 msecís.  Recommended operating pressure is up to 30 PSI, although valves were successfully tested up to 100 PSI and higher.

Valve drivers, which support the step function of the applied voltage are available separately.

Both the dispensation pressure and time affect the dispensation pattern and volume. Different pressures and timing should be used for:

1. "Soft" surface retained dispensation without bouncing and/or agitation

2. "Hard" stream dispensation for agitation, re-suspension, deep penetration, etc

3. Elimination of "satellite" droplets.

4. Forced atomization (spray-droplets).

    Various examples are shown in associated video clips.

 

Please contact us for additional information.

SMLD-100

SMLD-300

SMLD-300G

An example of an array layout using SMLD valves is shown above for illustration purposes.

   Orifice

(Sapphire seat and Ruby ball)