Daisy Multi Valve
Original price was: $2,500.00.$2,350.00Current price is: $2,350.00.
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- Technical Specifications
- Chemical Compatibility
- Customizations
- Accessories
- Maintenance
The Daisy Multi Valve features a 12-channel rotary valve manufactured by BioChem Fluidics — part of ArcMed, a world-class supplier of fluidic systems solutions. The rotary valve is typically used for sample collection, flow path selection or loop injection applications. The valve’s outer head is made of polytetrafluoroethylene (PTFE), whereas the rotor inside is machined out of chlorotrifluoroethylene (CTFE). Both materials are highly chemically inert, and there is no metal in the fluid path. As such, this rotary valve is specifically designed to provide an inert flow path for aggressive and/or reactive fluids.
A common axial port on the valve head gets connected with a different radial port every time the rotor turns another 30 degrees. Full rotor rotation takes approximately one second, so switching between neighboring ports takes under 100 ms.
The Daisy Multi Valve is ideal for applications where switching between different ports does not need to happen very frequently. We recommend a maximum duty cycle of one port-to-port move every one second. Operating at or below this maximum duty cycle will significantly extend the life of the valve by minimizing friction-induced wear and tear on its moving parts.
This rotary valve features easily flushed flow paths that are optimized to achieve the lowest possible internal volumes. Default orifice size on this module is 0.032″ (1/32 inch, or 0.8mm) in diameter, designed to match the flow geometry of PTFE tubing with an internal diameter (ID) of the same size. Other orifice diameter options are 0.052” (1.32 mm) and 0.096” (2.44 mm). Even larger ID’s can also be available for high flow speed applications. Simply contact us with details of your request.
Pressure drop across the valve can be estimated for a given orifice, flow rate and the total travel distance within the valve (23 mm from a radial port to the axial port). For instance, using Bernoulli’s equation, we can estimate an upper bound of approximately 600 ml/min of aqueous flow for 30 psi pressure drop across the valve (about 1.37 L/min for 150 psi) for an orifice ID of 0.032”. For 0.096” orifice ID, these upper bound estimates are 5.7 L/min for 30 psi and 12.7 L/min for 150 psi.
| Weight | 0.92 kg |
|---|---|
| Dimensions | 100 × 100 × 130 mm |
| Valve Volume | Dead Volume: 0 ul |
| Expected Life Cycle | 10 M cycles (with regular maintenance) |
| Leak Pressure | 150 psi |
| Wetted Materials | Head: PTFE |
| Port Configuration | 1/4-28 Standard |
| Unit Power Input | 24 VDC, 4 A |
| Power Adaptor Input | 110-240 VAC, 50/60 Hz |
| Adapter Safety Certifications | FCC, CE, UL |
| Color | Housing: Anodized black |
| Operating Conditions | Temperature: 10-40 degrees C |
| Orifice Diameter | ID: 0.032'', ID: 0.052'', ID: 0.096'' |
Chemical Compatibility
Polytetrafluoroethylene (PTFE) Chemical Compatibility Reference Table (adopted from www.calpaclab.com)
Polychlorotrifluoroethylene (P-CTFE) Chemical Compatibility Reference Table (adopted from www.professionalplastics.com)
Customizations
If you need an orifice ID even larger than 0.096” for your specialized application, contact us with your request.
Maintenance
Because of the inherent properties of the Virgin PTFE utilized in crafting the body (stator) of these valves, there will be a gradual release of PTFE fibers from the body over time. This phenomenon tends to be more noticeable in selection configurations compared to switching and combination applications, due to the typically lower fluid volume that lubricates the valve. While some fibers will remain firmly attached to the body at the inner orifice interfaces, others will be carried into the fluid stream.
In applications where pressures across the valve exceed 25 psi, the majority of fibers are expected to wash into the fluid stream, potentially necessitating the inclusion of a downstream filter in the instrument’s flow path. It is recommended to use a 50 micron (or finer) filter for this purpose. For medium-sized orifices (0.054”), any residual fibers should not cause more than a 3% flow restriction over the valve’s lifespan. Conversely, in applications with pressures equal to or less than 25 psi, most fibers will remain affixed to the body. Nonetheless, a downstream filter may still be beneficial to capture the minimal amount of fibers that do detach.
Over time, the accumulation of these fibers may lead to somewhat noticeable blockage (no more than 10% flow restriction). For valves used in low-pressure applications, a preventative maintenance (PM) routine is recommended to remove accumulated fibers. This involves flushing water at 50 psi for 2 minutes through each orifice. It’s advisable to repeat this routine at least every 100,000 cycles, or more frequently if preferred.
If a downstream filter is utilized, it is advisable to clean it every 100,000 valve cycles or as needed.
We also strongly recommend flushing the Daisy Multi Valve with DI water after it is used with aqueous buffer solutions. The salt in such solutions will tend to crystallize and damage the valve’s internal components over time if not flushed before the solution dries out. This is true for virtually all life science and process instrumentation components. Regular DI water flushes through each port takes care of the fiber wash requirement mentioned above, as well.
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