Category: Blog

Pratt® Knife Gate Valves available at Duncan Company

Pratt Knife Gate and Slide Gate valves have been produced since 1995.  Pratt specializes in custom knife gate valves from 2″ to 96″ and above, utilizing carbon steel to stainless steels and other weldable alloys.  With many years of combined experience in building knife gate valves in particular, every facet of the fabrication process from engineering to fabrication is done in their Woodland, WA facility.


Along with custom fabricated valves, Pratt resilient and metal seat cast knife gate valves from 2″ to 24″ in ductile iron or stainless steel.

Pratt Knife Gate valves can be manufactured to meet the “American Iron & Steel” (also known as AIS) requirement for the “Consolidated Appropriations Act of 2014.”

For more information on how we can help you, contact us at Duncan Company!

Stream-Flo products now available at Duncan Company

Stream-Flo wellheads, gate valves, check valves and valve automation and control are proven around the world in the most demanding operating environments.

for more information on Stream-Flo contact us at Duncanco

Stream-Flo’s wellhead systems provide solutions for surface production and injection applications, and are proven around the world in all service types.

Stream-Flo’s Crown Gate Valves bear the API monogram and are designed for all types of applications including wellhead, Christmas tree, frac tree, ESD, and choke and kill manifold systems.

Stream-Flo’s check valves are proven in the most demanding environments to provide safe, reliable pipeline operation.

Contact us at Duncan Company for help with your application!

Transmitter for gas density, temperature, pressure and humidity of SF6 gas

The model GDHT-20 transmitter is a multi-sensor system with digital output for the measurement parameters of pressure, temperature and humidity.  Based on these measured values, the condition-related data can be determined.

for more information contact us Duncanco!

Permanent Monitoring

In order to prevent system failures in switchgear and, with that, network outages, the permanent monitoring of the gas density and moisture content is essential.

The GDHT-20 transmitter calculates the current gas density from the pressure and temperature using a complex virial equation in the transmitter’s powerful microprocessor.  Pressure changes resulting from thermal effects will be compensated by this and will not affect the output value.

In addition, the GDHT-20 transmitter delivers humidity or dew point information online, which enables monitoring within the terms of Cigre guidelines and IEC Standards.

Signal Stability

Due to its high long-term stability, the transmitter is maintenance-free and requires no recalibration.  Through the hermetically sealed weld seam and a measuring cell design without sealing elements, the permanent sealing of the measuring cell is ensured.

The EMC characteristics fulfill the IEC 61000-4-2 through to IEC 61000-4-6 standards and guarantee an interference-free data output.


  • Permanent monitoring of the relevant gas condition parameters in closed tanks
  • For indoor and outdoor SF6 gas-insulated equipment

Special Features

  • High-accuracy sensor technology
  • MODBUS® output protocol via RS0485 interface
  • Ingress protection IP65
  • Very good long-term stability and EMC characteristics
  • Compact dimensions
For more help with your applications, please contact us at Duncan Company!


Lower Total Cost of Ownership with LESER Safety Relief Valves

Valve maintenance and repair play a significant role in the total cost of ownership through out the life cycle of a safety relief valve.  LESER has the lowest total cost of ownership due to its competitive initial valve pricing combined with very attractive parts pricing.  LESER’s superior valve design leads to better operation; in turn leading to less parts replacement, which significantly impacts the total cost of ownership of the valve.
LESER API for more information contact us at Duncan CompanyAPI 526 Series are approximately half the cost of competitors’, providing significant cost savings to our customers over the life of the valves.
Download the Total Cost of Ownership Brochure

Top Line is one of the biggest suppliers of Specialty & Sanitary Fittings

Top Line precision crafted clamp or weld lateral & true wyes and line splitters provide fast, sanitary, secure connections.  These precision crafted sanitary wyes and line splitters come standard with a 32Ra ID/OD finish.  They can be used to change flow direction in many applications for the food, beverage and dairy industries.  They are made to customer requirements and are available in a wide variety of sanitary finishes.

for more information contact us at Duncanco

Top Line’s capabilities include:  AutoCAD design, extensive machining services, automatic and semi-automatic welders, and 100% material inspection.
The Top Line team is always available to assist with your questions and provide guidance for your specialty fittings.  Please contact us today!

Donaldson Co. jumps into Beverage Filtration with LifeTec

It took the Donaldson Co. two years, 40 scientists and millions to build a better mouse trap  –  or a microbe trap, to be exact  —  for the beverage and yogurt manufacturers.

Donaldson, the filtration giant, known for devices that purify air, steam and gases inside factories, recently threw it’s filtration expertise into the world of consumable liquids for the first time.

The result is LifeTec, an ultrafiltration cartridge that captures microbes, bacteria and particles from beverages.  Officials cut the ribbon on a new manufacturing plant in Haan, Germany, earlier this month that will make the product and said it could result in big changes in the market.

for more information contact us at

LifeTec liquid filters capture dust, bacteria and the cryptosporidium and giardia parasites that could sicken humans and cripple most food makers if the microscopic pests accidentally squirmed into a product.  The LifeTec cartridge is designed for firms that must filter and sterilize water and other liquids to make mineral water, soda, cheese, yogurt, wine, beer and other beverage products.

LifeTec comes in various lengths starting at 10 inches and surpassing 40 inches.  Each cartridge should last one to three months before needing changing, depending on beverage-factory conditions.  While officially launched this month during the plant opening in Germany, LifeTec soon faces a whirlwind of global introductions at trade fairs, including the world’s largest industrial trade show, the Hannover Fair in Germany.

In the U.S., LifeTec will make its debut at the Northwest Food and Beverage Manufacturers Expo in Oregon in January and the Process Expo in Chicago in September 2017.

Thermal Mass Flow Measurement an Effective Solution for Liquid Leachate

Thermal Instrument manufactures a mass flow meter that can accurately and dependably measure the leachate flow at landfill operations.  Thermal Instrument has been measuring liquids with mass flow meter technology for more than 50 years and offer a tested solution for the measurement of leachate flow.

for more information contact us at

Leachate is the liquid that naturally drains down through the landfill waste levels collecting any dissolved or suspended materials as it passes through the ground.  It is a naturally occurring event that must be accounted for, captured, and treated as it is a pollutant.  It is the responsibility of the landfill operator to insure that this liquid makes it to a safe holding area prior to being treated and discharged.

for more info, contact us at

Advantages of using a Thermal Instrument Insertion Probe Flow Meter
  • Rugged Construction  –  316SS with available protective coating
  • Easy Installation  –  3/4″ MNPT Packing Gland
  • Installed Back up Sensors for inherent redundancy
  • Sensors are internal and never come into direct contact with passing fluid
  • Flow and Total Flow Monitored
  • 4-20mA output to data recorders, PLC’s, etc.
  • High Turndown Accuracy  –  100:1
  • Easy to clean and maintain
For help with your application, please contact us at Duncan Company!

Level Gauges that meet Compact Skid Design Requirements

Building a specialized skid with all the necessary equipment and measuring instruments required thoughtful, compact design.  Skids often have to fit in very limited space in a processing facility, meaning you have to fit in as much function as possible in the allotted space.

Level gauges with an inverted designed offer space-saving features.  In fact, Wika has helped a number of OEM skid builders come up with new space-saving skid designs that leverage this type of level gauge, which is fitted with multivariable transmitters and alarm switches that send process data.


For the complete article click here


Thermal Mass Flow Meters Measuring Carbon Dioxide (CO2)

Carbon Dioxide is generally not produced, rather is derived as a by-product from other processes such as the manufacturing of ammonia, fertilizers, power generation and other naturally occurring events.  The gas is then captured, cleaned, and bottled to be used in a wide variety of industrial processes.  These processes require measurement and that measurement can be performed by a Thermal Instrument Mass Flow Meter.

for more information contact us at Duncanco!

The use of Carbon Dioxide Gas (CO2) and then how it is captured in industrial applications has been scrutinized over these past few years, with all the discussion of greenhouse gases.  Thermal Instrument Mass Flow Meters have been used to measure the CO2 that is being used, and then re-captured in order to minimize GHG’s being released to the atmosphere.
Thermal Instruments Model #600-9 has a variety of process connections and the ability to be placed in line sizes as small as 1/4″, has been reliable measurement instrument for our customers that are managing their C02 usage.  The in-line unit has negligible pressure drop (application dependent), high repeatability, and the accuracy needed to manage this process for many years.  Our mass flow meters have been utilized in beverage manufacturing, power generation, and other manufacturing operations to name a few.
The Thermal Instrument Mass Flow Meter is available in standard 316 Stainless Steel for your industrial applications, and in a Sanitary (Model #600-9SAN) design that meets the requirements of Food, Beverage, and Pharmaceutical manufacturers if necessary.
Common Carbon Dioxide applications for our mass flow meter are:
  • Measuring the CO2 by-product at coal fired power plants for recovery, or to be sold as an additional product
  • Measuring CO2 in the carbonization and bottling process in the beverage industry
  • Food Processing for freezing or chilling, and packaging operations
  • Injecting CO2 into the ground during hydraulic fracturing near or at the site of oil wells to draw out every last trace of crude oil
  • As a raw material in the chemical industry
  • Used to enhance algae production for nutritional and health sciences
  • Cleaning the circuitry during the semiconductor manufacturing process removing impurities in place of chemical solvents



Sanitary Plug Valves for Low Temp Dairy, Beverage & CIP Lines

TOP-FLO® Plug Valves
TOP-FLO® Plug Valves

With minimal pressure drop Top Line’s 2 and 3-way sanitary plug valves are an excellent choice for low pressure low temperature dairy, beverage and CIP lines.

The valve is COP only (clean-out-of-place) and designed for 25psig at 100°F for use with non-hazardous products.

The valve comes in 304 or 316L stainless steel with an option of two different plug styles – silicone rubber or stainless steel.

Plug valves feature a tapered core assembly held in place with a wing nut and washer on the bottom.  This allows for easy disassembly and cleaning while eliminating crevices which can lead to contamination.  The valve and plug both have matching identification numbers on them so they don’t get mixed with other plug valves.

For more information on this contact us at 800-677-1776