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42 Cards in this Set
- Front
- Back
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1. Explain the need for “pressure regulation” in a pneumatic system. |
A pressure regulator delivers a constant pressure air supply to its legs of a circuit and insures that the stored pressure energy of an air receiver is not unnecessarily wasted |
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2. Identify the components of a pressure switch, safety relief valve, and pressure regulator. |
Pressure switch- consists of a spring, body, piston and inlet. Safety relief valve - consists of a body, Inlet ,exhaust ,poppet , and spring Pressure regulator - consists of a valve body, Inlet port, outlet port,piston, spring, and poppet |
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3. Explain how a pressure switch, safety relief valve, and pressure regulator operate, within a pneumatic system, to control pressure. |
Pressure switch- a common way of sensing tank pressure and controlling actuation and deactuation in a small compressor Safety relief valve - maximum pressure developed by a compressor is designed to be regulated by a control system which senses discharge or tank pressure Pressure regulator - delivers a constant pressure air supply to its leg of a circuit and insures that the stored pressure energy of an air receiver is not unnecessarily wasted. |
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4. Identify the pneumatic schematic symbols of a pressure switch, safety relief valve, and pressure regulator. |
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5. Describe the purpose and operation of a pneumatic double acting cylinder. |
Often used in a pneumatic system to achieve a reciprocating motion. the double acting cylinder has a port at each end of the cylinder body by which air under pressure can enter or exhaust.this causes the piston rod to extend or retract. |
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6. Identify the pneumatic schematic symbol of a double acting cylinder. |
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7. Identify the components of a directional control valve. |
Consists of a valve body with four internal flow passages and a moving part,a spool,which alternately connects a cylinder port to the supply pressure or to exhaust. |
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8. Explain the need for “flow rate control” in a pneumatic system. |
8 |
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9. Identify the components of a needle valve. |
Consists of a valve body and an adjustable part, the adjustable part being a tapered nose rod. |
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10. Explain how a needle valve affects air flow within a pneumatic system. |
Is positioned in a circuit so that it restricts air flow exhausting from an actuator port.the more the tapered nose rod is screwed towards it's seat in the valve body,the greater the restriction to free flow. |
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11. Identify pneumatic schematic symbols relating to material covered in this unit . filter |
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11. Part 2 Identify pneumatic schematic symbols relating to material covered in this unit . Motor |
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11. Part 3 Identify pneumatic schematic symbols relating to material covered in this unit . Pressure gage |
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11. Part 4 Identify pneumatic schematic symbols relating to material covered in this unit . Flow control valve |
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11. Part 5 Identify pneumatic schematic symbols relating to material covered in this unit .compressor |
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11. Part 6 Identify pneumatic schematic symbols relating to material covered in this unit . Air receiver |
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11. Part 7 Identify pneumatic schematic symbols relating to material covered in this unit . Check valve |
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12. List the color code for the air pressures at various locations in a pneumatic system. |
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Secondary Port |
Located on a directional control valve |
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Spring Bias |
increasing flow capacity. |
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Manual Test Lever |
Found on an actuator and powered by hand |
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Normally Non-passing (closed) Valve |
Normally Closed Valve: A valve that prevents the flow of air through it in the at-rest or unactuated condition. |
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Outlet Port |
The air exits the filter through the outlet port |
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Primary Port |
. Additionally the valve is used as a power valve for the supply of working air to the actuator. |
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Safety Relief Valve |
A control system that senses discharge or tank pressure |
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Inlet Port |
The air enters the filter through the inlet port |
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Flow Rate |
The volume of air flowing through a pipe in a period of time is a rate of flow. |
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Spool |
Is designed with "lands" that channel the flow through the valve to specific ports by shifting position the flow paths can be changed. |
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Actuator Speed |
Is determined by how quickly the actuator can be filled and exhausted of air |
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Directional Control Valve |
To change the direction of air flow to and from the cylinder. |
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Cylinder Piston Rod |
. The element transmitting mechanical force and motion from the piston. |
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Potential Energy |
is the energy that an object has due to its position in a force field or that a system has due to the configuration of its parts. |
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Pressure Switch |
Pressure Switch: Controls the electric motor by sensing the pressure in the tank. |
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Pressure Regulator |
Used to control the pressure of this stored energy to a leg of a circuit |
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Flow Control Valve |
Operates by causing a restriction |
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Prime Mover |
they are the primary source of mechanical energy or power. The mechanical energy produced by the prime mover is transmitted to another machine or mechanism, such as a pump or air compressor, to do some form of useful work. |
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Needle Valve |
Affects the operation by causing a restriction. |
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Exhaust |
Found on a valve body in a dcv |
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CFM |
a measure of volumetric flow |
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Poppet |
A component of a valve that seals or opens an internal passage across its full area to allow or prevent flow. |
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Normally Passing (open) Valve |
permit flow from inlet port of valve to outlet port normally the flow will be cut by changing the position of the valve |
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Double Acting Cylinder |
is a cylinder in which the working fluid acts alternately on both sides of the piston. |
