Refrigeration and Air Conditioning Technology (MindTap Course List)
8th Edition
ISBN: 9781305578296
Author: John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson
Publisher: Cengage Learning
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Textbook Question
Chapter 24, Problem 12RQ
Explain the following terms as they apply to electronic expansion valves:
step motor
offset
error
algorithm
microprocessor
feed back loop
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Explain the following terms as they apply to electronic expansion valves:step motoroffseterroralgorithmmicroprocessorfeedback loop
1.
Two double acting pneumatic cylinders (A, B) in a process industry should extend
together at the same time to open two different valves. On the return stroke both
cylinder rods return at the same time. The starting is by a detent switch. Both the
cylinders are of the same size with the same stroke length. In terms of notation, the
cycle is required to go on till the detent start-up switch is pressed again. Draw the
electro
pneumatic
circuit
neatly.
Briefly
explain
its
operation.
LB +J LB
A
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Y
Y
Y
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Define the term in theory of macines Meyer's expansion valve.
Chapter 24 Solutions
Refrigeration and Air Conditioning Technology (MindTap Course List)
Ch. 24 - Which is not a pressure or force acting on a TXV...Ch. 24 - The needle and seat of a TXV are normally made of...Ch. 24 - The TXV tries to maintain a constant _____in...Ch. 24 - The four types of charges that the TXV uses to...Ch. 24 - Prob. 5RQCh. 24 - When do some TXVs require an external an external...Ch. 24 - Draw a diagram showing how an external equalizer...Ch. 24 - The TXV responds to an increased heat load by A....Ch. 24 - The three factors that determine the capacity of a...Ch. 24 - Explain why the entering liquid pressure has no...
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- Give the name of the following graphic symbols or Draw the graphic symbol according to the following name 4.(a) variable displacement motor (b) Pressure reducing valve (c) Directional control valve for 4-way, 3-position, O type neutral conditions (d) check valvearrow_forwardWhat is meant by regulator creep?arrow_forward5) When the sequence valve is in normal state, the main valve port is in ( ) state. When the pressure reducing valve is in normal state, the main valve port is in ( ) state. a) open b) close c) Undetermined Symbols Questions 1) Give the name of the following graphic symbols. Pe А В P Tarrow_forward
- Provide the names of any four types of valves along with their applications.arrow_forwardWhen using a flow control valve (needle valve) to control the speed of actuation of a cylinder, what needs to be added to the valve in order to maintain that speed under varying load pressures and why?arrow_forwardFor what application are the pressure control valves seen in Figure 2 being used? Sol A Sol B Figure 2arrow_forward
- one way flow control valve is the type of valve which is used to control the speed of an actuator. Select one: O True O Falsearrow_forwardWhich of the following is NOT a flow control valve? Servo valve O Needle valve O All of these are flow control valves O Pressure compensated valve O Non-pressure-compensated valvearrow_forwardComplete the schematic below to provide for the following: 1. Cylinders extend and retract together. The cylinders extend when the valve lever is pulled ouat and retract when the lever is pushed in. 2. Provide independently adjustable meter-in flow control for extend. The flow control used to extend Cyl #1 should be labeled "FC1". The flow control used to extend Cyl #2 should be labeled "FC2". 3. Provide independently adjustable meter-out flow control for extend. retract The flow control used to retract Cyl #1 should be labeled "FC3". The flow control used to retract Cyl #2 should be labeled "FC4". CYL1 CYL #2 "AUHVAarrow_forward
- Pressure control valves determine maximum system pressure True Falsearrow_forwardMatch the correct port/hole with its function in a pressure regulator.arrow_forwardExamine the circuit shown below and answer the following questions: 1. How is the cylinder 3A (towards the right) fundamentally different than cylinders 1A and 2A? 2. Describe 5 key features (ways, actuator, etc.) of the directional control valve 1V1. 3. Describe 5 key features of directional control valve 3V. 4. What type of device is 1V2? 5. Here's a close up of 1V2. Is it metering-in or metering-out? How do you know? 6. Empty triangle shapes appear in many places in this schematic. What do they represent? 1A 181 182 2A 282 3A 281 381 WWE 1V2 1V3 2V2 2V3 1V1 2V1 2Y1H svos H2Y2 3Y1 V 1V3 OV] OY1 211AM OZarrow_forward
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