ASME Y14.40.8:2002 pdf download GRAPHICALSYMBOLS FORDIAGRAMS, PART8: VALVES AND DAMPERS
SCOPE
This Standard specifies graphical symbols for valvesand dampers in diagrams, including symbols for general-purpose valves, those used in fluid power systemsand hygienic valves used in the food and pharmaceuticalindustries.
For the fundamental rules of creation and applicationof graphical symbols in diagrams, see ASME Y14.40.0.For an overview of the ASME Y1440 series, information on the creation and use of registration numbers foridentifying graphical symbols used in diagrams, rulesfor the presentation and application of these symbols,and examples of their use and application, see ASMEY14.40.1.
2 REFERENCES
The following references contain provisions that,through reference in this text, constitute provisions ofthis Standard. The latest edition applies.
ASME Y14.40.0 Basic Rules for the Design of GraphicalSymbols for Use in the Technical Documentation ofProducts
ASME Y14.40.1, Graphical Symbols for Diagrams, Part1: General Information and IndexesASMEY14.40.2,Graphical Symbols for Diagrams, Part2: Symbols Having General ApplicationASME Y14.40.4,Graphical Symbols for Diagrams, Part4: Actuators and Related DevicesPublisher: The American Society of Mechanical Engineers(ASME)，Three Park Avenue,New York，NY10016;Order Department: 22 Law Drive，Box 2300.Fairfield，NI 07007
3 TERMS AND DEFINITIONS
For the purposes of this Standard, the following termsand definitions apply.
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safety ualve: valve that automatically, without the assistance of any energy other than that of the fluid concerneddischarges a certified quantity of the fluid so as to pre-vent a predetermined safe pressure being exceeded, andthat is designed to reclose and prevent the further flow of fluid after normal pressure conditions of service havebeen restored.
3.2
Dacilim walve: valve that automatically and without theassistance of any energy other than that of the gas concerned, admits gas to a pipeline or tank in order toprevent a predetermined safe underpressure beingexceeded.
3.3
control valve: power-operated valve in an industrialprocess control system for changing the flow rate of theprocess fluid.
3.4
restrictor: device that restricts the flow of a fluid, therebycreating a pressure drop.
35
restrictor valve: valve in which the inlet and outlet portsare interconnected through a restricted passageway
NOTE: In a fixed restrictor valye the cross-sectional area cannotbe altered; in an adjustable restrictor valve the cross-sectional areacan be adjusted.
3.6
release walve: valve through which undesired air or steamin a pipe system may be released.
3.7
presstire-reducing walve pressure regulator: valve in whichwith varying inlet pressure or outlet flow, the outleipressure remains substantially constant, but in whichthe inlet pressure remains higher than the selected outletpressure.
3,8
pressure-relief walve: valve that limits maximum pressureby exhausting fluid when the required pressure isreached.
3.9
exhaust walve: valve in which the outlet is automaticallyopened to exhaust when the air pressure falls at the inlet
ASME Y14.40.8:2002 pdf download
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