Standard No.:	GB/T 27612.1-2023
English Name:	Agricultural irrigation equipment—Sprinklers—Part 1:Definition of terms and classification
Chinese Name:	农业灌溉设备 喷头 第1部分：术语和分类
Chinese Classification:	B91    Farming machinery and tools
Professional Classification:	GB    National Standard
ICS Classification:	65.060.35 65.060.35    Irrigation and drainage equipment 65.060.35
Issued by:	SAMR; SAC
Issued on:	2023-11-27
Implemented on:	2024-6-1
Status:	valid
Superseding:	GB/T 27612.1-2012 Agricultural irrigation equipment—Sprinklers—Part 1:Definition of terms and classification
Language:	English
File Format:	PDF
Word Count:	11500 words
Price(USD):	345.0
Delivery:	via email in 1~3 business day

GB/T 27612.1-2023 Agricultural irrigation equipment - Sprinklers - Part 1: Definition of terms and classification 1 Scope This document defines terms related to irrigation sprinklers and specifies the classification of sprinklers according to the following categories: physical factors; characteristics of the water spray; the mechanism for operation and water distribution; the mechanism for sealing; the intended use; additional functions incorporated into the sprinkler. This document applies to cover the widest possible range of sprinkler construction, performance, and intended-use alternatives. 2 Normative references There are no normative references in this document. 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 accumulator pressure accumulator hydraulic device that stores fluid under pressure and cushions shock waves 3.2 anti-drain valve valve designed to remain closed whenever the system pressure does not exceed a pre-set value and to open for higher pressures 3.3 chemigation application of chemicals through irrigation systems 3.4 compression-disk nozzle nozzle fitted with an elastic disk that flexes under pressure so as to alter the hydraulic properties of the nozzle 3.5 cross vane flow conditioning vanes, the design of which tends to trap waterborne contaminants 3.6 constant-acceleration nozzle nozzle, the shape of which changes gradually and smoothly so as to cause a constant rate of acceleration in the flow passages 3.7 constant-flow nozzle nozzle, the internal geometry of which does not vary under fixed operating conditions thus maintaining constant hydraulic properties 3.8 constricting-flow nozzle nozzle fitted with elastic sleeves that alter the hydraulic properties of the nozzle in response to changes in operating pressure 3.9 continuous-move irrigation machine irrigation machine in which the position of sprinklers is fixed on a supply line which moves continuously in a particular direction Example: Centre pivot irrigation machine, moving lateral irrigation machine, traveller irrigation machine. 3.10 controlled-acceleration nozzle nozzle, the shape of which changes gradually and smoothly so as to cause a specific rate or rates of acceleration in the flow passages 3.11 customized nozzle nozzle, the design of which meets specified hydraulic criteria for acceleration, turbulence and separation 3.12 element parallel to water flow upstream flow conditioning component, the centreline of which is parallel to the nozzle centreline 3.13 element not parallel to water flow upstream flow conditioning component, the centreline of which is at an angle to the nozzle centreline 3.14 spray elevation height to which a spray rises above a horizontal plane passing through the elevation of the nozzle 3.15 finger spray stream of water directed either as a cohesive or continuous jet or as a concentration of individual drops 3.16 flexing-orifice nozzle nozzle fabricated from elastic materials that flex under pressure so as to alter the hydraulic properties of the nozzle 3.17 flow-rate change mechanism mechanism provided that automatically changes hydraulic properties during operation 3.18 fluidic device device (such as an amplifier or control) that depends for operation on the pressures and flows of a fluid in precisely shaped channels 3.19 gradual-acceleration nozzle nozzle, the shape of which changes gradually and smoothly so as to cause a gradual, usually linear, acceleration in the flow passages 3.20 groove along flow passages rifling along flow passages flow conditioning element designed to modify hydraulic properties of the flow passage thus increasing flow passage turbulence 3.21 impact arm balanced arm of a sprinkler rotating about a vertical axis (usually corresponding to the sprinkler axis) that momentarily intercepts and deflects a portion of the jet so as to provide the torque required to rotate the water distribution component of the sprinkler 3.22 impulse arm balanced arm of a sprinkler rotating about a horizontal axis that momentarily intercepts and deflects a portion of the jet so as to provide the torque required to rotate the water distribution component of the sprinkler 3.23 jet-spray stream of water issuing from an orifice under pressure 3.24 location of maximum trajectory height radial distance from the sprinkler axis at which the maximum trajectory height is reached 3.25 maximum trajectory height maximum height, above a sprinkler or a sprayer of the trajectory of the principal water stream discharged from the sprinkler nozzle or sprayer operating at test pressure 3.26 mechanically-controlled stream breakup sprinkler sprinkling device with a capability for controlling stream breakup in a series of mechanically pre-set repeatable cyclic patterns 3.27 moveable fixed-grid agricultural system irrigation system in which sprinkler set positions are nominally fixed by a supply pipeline, a hydrant, infield access or other infrastructure constraints Example: Hand-move system, wheel-move system. 3.28 moving sheet sheet spray which moves in a linear fashion or which rotates 3.29 no-variation sprinkler systems sprinkler systems that operate on mechanically controlled repeatable cycles 3.30 no-statistical-variation sprinkler systems sprinkler systems that operate without fixed mechanical control, but that produce statistically repeatable results 3.31 nominal size numerical designation used to refer to the size of a sprinkler which is identical to the nominal diameter of a pipe to which the sprinkler is intended to be connected directly 3.32 nozzle aperture or adjutage in a sprinkler through which water is discharged 3.33 off-axis-bore nozzle nozzle in which the orifice centreline does not correspond to the nozzle centreline 3.34 open vane nozzle nozzle with flow conditioning vanes that are designed to shed waterborne contaminants