Instrumentation and Control Drawings Unit 23 Instrumentation and Control Drawings

Learning Objectives Describe the types of control diagrams. Identify symbols used on fluid power diagrams. Recognize supplementary information accompanying circuit diagrams. Read a graphic diagram. Interpret graphic diagrams for fluid control devices.

Graphic Diagram Components and piping are shown as schematic symbols

Pictorial Diagrams Components are shown in a pictorial form and piping shown as lines

Cutaway Diagrams Components are shown in a cutaway form Emphasizes the internal functions and connections

Combination Diagram Components and piping shown as graphic symbols, in pictorial, or as cutaways Describes the purpose of the diagram

Instrumentation and Control Diagram Terminology Accumulator: Container in which fluid is stored under pressure as a source of fluid power Actuator: Device for converting fluid power energy into mechanical energy Examples include motors and cylinders Circuit: Complete path of flow in a fluid power system

Instrumentation and Control Diagram Terminology Component: Single hydraulic or pneumatic unit Control: Device used to regulate the function of a component Enclosure: Housing for components Indicated by a center line rectangle in diagrams Fluid: A liquid or gas

Instrumentation and Control Diagram Terminology Port: End of a passage in a component Reservoir: Container for storage of liquid in a fluid power system not under pressure Restriction: Area in a line or passage with a reduced cross section that produces a pressure drop Sometimes called an orifice

Fluid Power Diagram Symbols In a diagram, lines can be solid or dashed and may include dots or arrows to assist the print reader with interpreting the circuit

Fluid Power Diagram Symbols

Fluid Power Diagram Symbols In a diagram, there are various symbols for valves and other flow-control devices

Supplementary Information The sequence of operations is an explanation of the various functions of a circuit in the order of operation Solenoids are electrical components used to create reciprocating motion such as for switching Listed on a solenoid chart Component lists include the name, model number, quantity, and supplier or manufacturer of components in the circuit Sometimes called a parts list or bill of materials

Reading a Graphic Diagram Refer to the sequence of operations for this circuit at the end of the unit

What do you see? Print supplied by Talley Industries.