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Find What You Want In Less Clicks

The Dwyer Instruments, Inc. website was launched 21 years ago and was one of the first instrumentation e-commerce websites of its kind. Over the years as new products and features were added to the site, navigation became more complex for new users. Dwyer continually strives to improve the user experience by making platform updates and reducing the number of clicks it takes to find and order a desired product.  To that end, users will begin to see navigation updates on the W.E. Anderson® by Dwyer Valve Automation website (www.weavalves.com) in May.  To round out 2017, these changes will incrementally be updated across the entire Dwyer platform. Continue reading “Find What You Want In Less Clicks”

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Advances in HVAC Test Equipment: The Importance of Diffuser Calibration for Flow Hood Measurements

Introduction

Objective

The objective for this writing is to inform HVAC technicians and contractors about the limitations of testing equipment currently used for testing, adjusting, and balancing HVAC systems. The need for more accurate instruments is immediate as energy programs are moving toward net-zero energy building efficiencies.

In doing so, HVAC technicians and contractors will struggle with tighter specifications as they tune HVAC systems with instruments that fail to provide the required accuracy and versatility. Continue reading “Advances in HVAC Test Equipment: The Importance of Diffuser Calibration for Flow Hood Measurements”

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Control Valve Actuator Sizing and Valve Action Selection

Control valves are used to change process conditions such as flow, temperature, level, and pH. A complete control system would include: a sensor, controller, positioner or current to pressure transducer, and control valve.  Globe valves, such as the Dwyer Series 2000VA/ 3000WA Hi-Flow™ Control Valve, are a very common type of control valve.

Hi-Flow™ Valve

The Dwyer Hi-Flow™ Series control valves have pneumatic actuators that modulate the valve for flow control. The opening, closing and throttling of the valve plug is accomplished by varying the air pressure to the diaphragm in the actuator. Typically the control pressure signal is 3 to 15 psig. There are two types of actuators: Air-To-Lower and Air-To- Raise. Continue reading “Control Valve Actuator Sizing and Valve Action Selection”

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Air Velocity and Flow Measurement with Pitot Tubes

Dwyer Instruments offers many styles of Pitot tubes, which are a commonly used sensor  for monitoring air velocity and flow rate in heating, ventilation, and air conditioning.

Pitot tubes are based on Bernoulli’s equation, which states an increase in the speed of a fluid occurs simultaneously with an increase in dynamic pressure and a decrease in static pressure.  Pitot Tubes sense the dynamic pressure of the fluid flow at a particular point and were invented by French Engineer Henri Pitot in the early 18th century.

Continue reading “Air Velocity and Flow Measurement with Pitot Tubes”