One of the largest bean processors in the U.S. set-out to upgraded their waste water treatment plant. Included in the upgrade were three 16” resilient seated butterfly valves used for level control. The valve manufacturer they purchased the butterfly valves from does not make a positioner, so they outsourced a low-cost positioner to be competitive in the bid process.
After installing this low-cost positioner in the plant, difficulties arose because the instrument air had a considerable amount of water in it. The positioners were not able to handle the water, especially at freezing temperatures. Unfortunately, the manufacturer of the low-cost positioner offered no spare parts to remedy the issue. In an effort to keep the plant up and running, plant maintenance installed heat lamps on each positioner to keep them above freezing and help dry them out. This had limited success and the positioners were never fully restored to working condition.
Plant maintenance contacted their local VAC stocking distributor who supplied them with three new V200E positioners the next day, complete with stainless steel mounting kits and auto drain filter regulators. The V200E positioners were installed to replace the damaged units. In addition to the positioners, the plant purchased the two recommended spare parts. In the event of future issues, they can repair the positioner in place, using only a screwdriver, and return it to original performance in minutes.
VAC V200 positioners keep your plant running by providing reliable and accurate valve positioning, along with easy maintenance and repair.
A VAC Distributor in the Northeast US working closely with a skid builder has specified the VAC D400 digital positioner as a standard offering on all control valves. Due to the custom nature of the skids this can present difficulties as many different types, brands and configurations of valves are needed. When the customer asked if VAC could supply mounting for the D400 to four different specialty valve configurations VAC answered YES!
The customer provided VAC with these special vacuum jacket insulated cryogenic valves. Each valve required a unique mounting solution as the actuators are from multiple vendors.
As an Independent Positioner company VAC easily provided the customer and end user with the same positioner on all control valves on the skid regardless of Valve Type, Brand, or Size, minimizing spares, reducing training, and increasing productivity and up time.
Ask VAC about improving your productivity and reducing costs with a comprehensive Valve Positioner Solution.
A food products company in Quebec, Canada uses iris type dampers to control the flow of air into fluidized bed product dryers. This equipment was originally supplied with now obsolete analog positioners, replaced with a digital piezo valve positioner. Product quality suffered due to instability of the system as a whole. The positioners were working overtime, noisy, and failed prematurely.
Solution, the VAC D400 with its rugged construction, poppet pneumatic relay design, and very high vibration tolerance (certified to DIN IEC 68-3-3 Class III, Mechanical vibration ≤ 1% up to 10 g and 10…80 Hz) solved the problem. The Standard Adaptive control (self learning program) tuned out process instability, and local support from our stocking distributor assured proper installation, parameter setup for stroke time, and stroke length have improved repeatability of the airflow to the dryers to LESS than 1%. This has resulted in improved productivity and better quality finished product. The customer has plans to install the D400 on all of its dryers in the near future.
The V100 series product (BLX) is a proven performer and a complete package of pneumatic and electropneumatic valve positioners. The R100 stackable feedback module can complete a Nema 4X package. This series offers a number of special features including Nickel or Tufram® coating. Flexible mounting to rotary or linear actuators is made easy with the "quick connect" couplings.
Tufram® is a registered trademark of General Magnaplate Corporation
Cast Aluminum, polyester housing that is Nema 4X rated. All stainless steel retained fasteners. A thick stainless steel cam that is double locked with sturdy cam nut. The bottom plate helps absorb vibration.
Screw driver slots in the span and zero ferrules, along with an external zero adjustment, helps make setting up the positioner simple. The minimum interaction between zero and span mean you can make a span adjustment without always returning to zero with each adjustment saving you valuable time.
Special cams, range springs, various pilots, spindles (drive connectors), gauges, dome indicators, and position feedback are examples of the options that are available from VAC. In addition, special requests are welcomed and encouraged-so please give us an opportunity to help you with any application need.
The pilot valve assembly can be easily cleaned (dry alcohol base) by removing one screw and blowing the assembly clean. The unique O-ring gasket prevents loss of individual O-rings in the cleaning process. The assembly can then be easily re-installed in only one direction, with a design that automatically "pinches" the upper lever leaf spring that is used to help stabilize the pilot. I/Ps can be changed, removed, converted in minutes and the I/P test points on the small connection board make checking the I/P or the circuit very simple.
One housing for pneumatic or electro-pneumatic, where I/P can be installed, removed, or converted at any time-while still mounted on the actuator. Various mounting capabilities - rotary or linear. Standard indicator can be reversed to direct or reverse acting and always show the proper scale (0-100%). Flat or raised indicators. F05 mounting hole pattern with multiple drive options that can be field converted...and more!
This compact NEMA 4X valve positioner allows for an internal I/P, switches, and a 4/20 mA transmitter, all in one compact, rugged, die-cast, aluminum housing. The flexibility to add, remove, replace, and calibrate this valve positioner is very user friendly.
All in one housing
This compact NEMA 4X valve positioner allows for an internal I/P, switches, 4/20 mA transmitter, all in one compact, rugged die cast aluminum housing. The flexibility to add, remove, replace, and calibrate this unit is very user friendly.
The ability to calibrate a positioner is important. Time can be money, and with the V200 positioner, calibration is made simple, easy, and NOT time consuming. Both Zero and Span can be adjusted without removing the cover, and the single spring has very little interaction.
Being able to get all of the needed options from a single product can be a real benefit. For basic pneumatic to various Ip options (standard, IS, EX, FF, Gas approved, 0-10V) and adding valve position feedback into the one compact housing is a benefit. The flexibility of going from one type to the other in minutes saves time and money. Quality construction of each product equals accurate control and long service life.
As the need for valve position feedback grows, the V200 positioner allows for very accurate feedback options. From switches to 4/20 transmitter, these components fit very neatly and simply into the one NEMA 4X housing.
The flexible mounting allows for mounting to many actuators, built in gauge block, various pilot assemblies, special cams, beacon indicator, and more are available from one source-one product.
The latest in positioner technology is available in our D400 and D500 digital series valve positioners. These microprocessor based products are available with an extensive list of features and benefits. Nema 4X is standard, with both IS and EX products available in the D400 model. The D500 offers "advanced diagnostics", SIL II approvals as well as "emergency shut down" option.
The latest in positioner technology is available in our D400 and D500 digital series valve positioners. These microprocessor based products are available with a very extensive list of features and benefits. Nema 4X is standard and IS and EX products are available in the D400 model. The D500 offers "advanced diagnostics", SIL II approvals as well as "emergency shut down" option. VAC stocks these products with Hart communication and a variety of accessories and mounting kits.