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 large Florida-based sugar plant has been a user of the VAC V100 Positioners for many years. On a regular visit to the plant it was mentioned that it would be useful to standardize and have more control valves to use the V100. They have many linear globe and segment ball rotary control valves on steam service. The OEM positioner for those valves is very expensive and not repairable on the valve causing excessive down time.
The VAC distributor provided retrofit kits for each valve type/model which included linkages, fittings, and all other small parts needed to install a V100 positioner on existing valves. The distributor made sure all the necessary components were grouped under one part number to simplify the ordering process for the maintenance department. These retrofit kits make it much simpler to replace the existing positioners with the VAC V100 and take advantage of the repairability of the V100. In fact, it takes less time to install a new V100 positioner than it does to replace the OEM positioner!
Using the V100 on more valves simplifies training and maintenance. With only two spare parts, maintenance can repair a V100 positioner, on the valve and in the field in just minutes using simple tools. The reduced downtime and higher reliability of the VAC V100 positioner will improve production during periods of higher sugar demand and do it at reduced cost to the plant!
VAC retrofit, reliability and repairability always mean reduced operating cost and downtime for you. Ask your local VAC stocking distributor how using VAC positioners on all of your control valves, regardless of brand or type, can help you have a more reliable plant and reduce costs.
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 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.