Title: Unit 6 Outline
Course: HET 273 - Pneumatic, Electric and DDC Automation - Spring 2015 > Section: HET 273 - Pneumatic, Electric and DDC Automation - Spring 2015

Unit 6 Outline

Unit 6 Outline
Unit 6 Outline

Pneumatics - Actuators, Dampers, Valves

Objectives

This week’s assignments will support the HVAC Learner to:

- Actuator Function
- Describe actuator components
- Explain spring range
- Describe damper types
- Understand damper operation
- Describe valves
- Understand valve operation

Introduction

In the HVAC/R industry there are many needs to start, stop, regulate, and control the flow of gases and liquids. The HVAC/R must have a good understanding of the devices that accomplish this. This section will specifically discuss dampers and valves along with the actuators that operate them.

Vocabulary

- Actuator
- Diaphragm
- Spring Range
- Spring Range Overlap
- Linear Valve
- Quick Opening Valve

This Week’s Learning Objectives

1. Actuators
  1. Components
  2. Operation
  3. Testing
  4. Dampers
    1. Types
    2. Components
    3. Operation
    4. Valves
      1. Types
      2. Components
      3. Operation

Summary

- Dampers come in many shapes and sizes
- They are classified as parallel, opposed, and round blade
- Dampers have seals to prevent leakage
- Valves are normally closed or normally open
- It is critical that valves be properly sized to ensure proper system operation
- Activators accept signals from a controller and causes a proportional mechanical motion to occur
- Activators control dampers and valves
- Activators have several common spring ranges