NSF certification for solenoid valves in OEM systems has become more important.

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NSF certification for solenoid valves in OEM systems has become more important.

(RO) reverse-osmosis ie reverse-osmosis filtration systems offer valuable service in a wide variety of industrial and commercial settings.

What can they do?

– They purify water, improve taste.

– Provide savings in food and beverage processing.

– Increase energy efficiency in boilers and supply a range of other benefits in applications from water jet cutting, vehicle washing, and humidification to restaurant and grocery use.

The solenoid valve is an important component of membrane-based RO systems, typically used at several critical points. Design engineers working for original equipment manufacturers (OEMs) face multiple options — and issues — when selecting these complex, highly engineered devices for their systems.

Besides of the usual considerations of correct sizing and wattage, many current models may exhibit worrisome performance problems, as well as other difficulties relating to certifications, availability, ease of assembly, and support, among others.

Here are the keys to selecting the right solenoid valve for RO systems.

  1. Does it have the proper certifications?

Not only in the US, OEMs must accommodate new regulations in many parts of the world, including those specifying the use of lead-free products and more.

Recently, regulations and their means of adoption have been changing with relative rapidity. One thing is important here is specifying composite valves for these RO systems, have to pay close attention to how the certification status of each product is stated.

If some don’t mention NSF certification, which may be the given product does not possess it. This should be a red flag, because of it could legally preclude the use of OEM RO systems in certain North American localities, such as in California or Vermont.

  1. Will it be available when I needed?

Do not worry, more and more often, today’s lean manufacturing methodologies demand the ready availability of composite valves used in RO systems — as do the lower work-in-process inventory requirements now common in OEM operations.

When evaluating valve makers, please note, consider availability issues such as quick-shipment programs, local coverage, and the specific inventory of required composite valves. What are the lead times and delivery schedules? Request the suppliers’ record of meeting shipment dates for its quick-ship program.

  1. Is it reliable?

The composite valves for RO applications must also be carefully considered when selecting. They can have a real impact on product reliability, maintenance costs, and service life.

  1. Is it can connect easily and securely?

Connections be a major concern when specifying composite valves for RO applications. However, that has been concerns in the past in solution. Designer today they have a new better choice that is advanced types of quick-connect technology that can maximize ease and speed, while also preventing leaks.

  1. Is it easy and economical to design and install?

Some of the situations especially difficult and time-consuming can make integration of valve components into purified water and reverse-osmosis filtration systems.

Here is the case of, commonly, desired performance characteristics are maximized by using, PEX tubing in one part of an RO system, and PVC or copper (CTS) tubing in another part. However, this requires the design, specification, purchase, assembly, and installation of custom fittings or adapters at the place or places where components of differing types of materials must come together. When multiple such situations exist in a single piece of equipment, or in cases where OEMs must turn out high volumes of such equipment, added costs and lost time can be substantial.

Another issue may arise here is cracking. Where composite valves threaded for NPT connection must be assembled or installed. When a piping assembly is put together, the solenoid valve is screwed onto the pipe with a given torque or pressure, to the tightness required for a good seal. However, this procedure usually will not leave the valve aligned correctly, for instance in an upright position, for proper mounting. So the solenoid valves must then be further rotated into its final position

With brass or stainless steel valve bodies, there is no harm when doing such over-tightening. But depending on the degree of rotation involved, the thermoplastic threads of composite models may easily split or crack under the increased strain — ruining the entire valve. This cracking may only be evident when the system is pressurized (worst case: in the field), after which the entire component must be disassembled and replaced.solenoid valves

  1. Is it available in both normally closed and normally open versions?

What we have to do is Identify sources that offer both normally open and normally closed composite solenoid valve versions. This can supply needed design speed and flexibility while simplifying sourcing with fewer part numbers to keep in stock. It may even save money.

  1. Does it come with the right support?

When selecting solenoid valve for an RO system, evaluate potential buys on the level of support available from the supplier and also don’t stop at hardware characteristics. Thus, carefully consider the quality of the support as well as basic geographical reach.

Do not forget this step, we should extend beyond phone calls and site visits to get their advice. At now, the Web has greatly expanded support possibilities for providing technical product information, specification assistance with sizing and application issues, and even 3-D engineering drawings and similarly enriched content.

Final Thoughts

To maximize the benefits of the selection of a specific solution, compare widely and evaluate carefully. Consider:

– Up-to-date certifications; ready availability.

– High reliability even in challenging applications; quick, secure connection.

– ease of use and ensured savings in design, assembly, and installation

Pay attention to the new composite valve technologies can offer notable benefits when improved valves are specified for membrane-based filtration functionality in reverse-osmosis systems.

For the OEM, they all add up to greater cost savings, longer ensured equipment life, and shorter time to marke.