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GB/T 18691.2-2021: Agricultural irrigation equipment - Irrigation valves - Part 2: Isolating valves
Status: Valid GB/T 18691.2: Evolution and historical versions
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Agricultural irrigation equipment - Irrigation valves - Part 2: Isolating valves
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GB/T 18691.2-2021
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| GB/T 18691.2-2011 | English | 559 |
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Agricultural irrigation equipment -- Irrigation valves -- Part 2: Isolating valves
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PDF similar to GB/T 18691.2-2021
Basic data | Standard ID | GB/T 18691.2-2021 (GB/T18691.2-2021) | | Description (Translated English) | Agricultural irrigation equipment - Irrigation valves - Part 2: Isolating valves | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | B91 | | Word Count Estimation | 16,182 | | Issuing agency(ies) | State Administration for Market Regulation, China National Standardization Administration | GB/T 18691.2-2021: Agricultural irrigation equipment - Irrigation valves - Part 2: Isolating valves---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Agricultural irrigation equipment -- Irrigation valves -- Part 2: Isolating valves
ICS 65:060:35
CCSB91
National Standards of People's Republic of China
Replacing GB/T 18691:2-2011
Agricultural irrigation equipment irrigation valve
Part 2: Isolation Valves
(ISO 9635-2:2014, IDT)
Published on 2021-12-31
2022-07-01 Implementation
State Administration for Market Regulation
Released by the National Standardization Administration
foreword
This document is in accordance with the provisions of GB/T 1:1-2020 "Guidelines for Standardization Work Part 1: Structure and Drafting Rules of Standardization Documents"
drafted:
This document is part 2 of GB/T 18691 "Irrigation Valves for Agricultural Irrigation Equipment": GB/T 18691 has released the following parts:
--- Part 1: General requirements;
--- Part 2: Isolation valve;
--- Part 3: Check valve;
--- Part 4: Intake and exhaust valves;
--- Part 5: Control valve:
This document replaces GB/T 18691:2-2011 "Irrigation Valves for Agricultural Irrigation Equipment - Part 2: Isolation Valves", and GB/T 18691:2-2011
In contrast, except for structural adjustments and editorial changes, the main technical changes are as follows:
--- Changed the requirements for hydraulic characteristics (see 5:4, 5:3 of the:2011 edition);
--- Changed the pressure holding time of the valve durability test (see Appendix D, Appendix D of the:2011 edition);
--- Changed the calibration requirements for the valve durability test instrument (see Appendix D, Appendix D of the:2011 edition):
This document uses the translation method equivalent to ISO 9635-2:2014 "Irrigation Valves for Agricultural Irrigation Equipment - Part 2: Isolation Valves":
The Chinese documents that have a consistent correspondence with the international documents normatively cited in this document are as follows:
---GB/T 18688-2012 Test method for pressure loss of irrigation valves of agricultural irrigation equipment (ISO 9644:2008, IDT):
The following editorial changes have been made to this document:
--- Replace "bar" with "MPa" conversion:
Please note that some content of this document may be patented: The issuing agency of this document assumes no responsibility for identifying patents:
This document is proposed by China Machinery Industry Federation:
This document is under the jurisdiction of the National Agricultural Machinery Standardization Technical Committee (SAC/TC201):
This document is drafted by: Zhejiang Daming Electromechanical Co:, Ltd:, Jiangsu Huanli Technology Development Co:, Ltd:, Jiangsu Huayuan Water Saving Co:, Ltd:
Co:, Ltd:, Lewei Pump Co:, Ltd:, Samsung (Wenling) Pump Co:, Ltd:, China Academy of Agricultural Mechanization, Jiangsu University Fluid Machinery
Engineering Technology Research Center, National Pump and System Engineering Technology Research Center, Anhui Provincial Institute of Product Quality Supervision and Inspection, Visega (Mountain)
East) Intelligent Technology Co:, Ltd:
The main drafters of this document: Yu Hui, Xie Chao, Qiu Zhipeng, Zhang Haiping, Chen Jian, Zhang Xiansheng, Yuan Shouqi, Zhao Liwei, Yin Gang, Wang Yang,
Lu Shusheng, Li Mingyu, Wei Yuanchao:
The previous versions of this document and its superseded documents are as follows:
---First published in:2011 as GB/T 18691:2-2011;
---This is the first revision:
Introduction
GB/T 18691 "Irrigation Valves for Agricultural Irrigation Equipment" is planned to be composed of the following five parts according to product characteristics:
--- Part 1: General requirements: The purpose is to give general requirements for the design, performance and consistency evaluation of irrigation valves:
--- Part 2: Isolation valve: The purpose is to give the requirements for the design, performance and consistency evaluation of the isolation valve, and to give the unique characteristics of the isolation valve:
technical requirements:
--- Part 3: Check valve: The purpose is to give the design, performance, consistency evaluation and other requirements of the check valve, and to give the unique characteristics of the check valve:
technical requirements:
--- Part 4: Intake and exhaust valves: The purpose is to give the design, performance, consistency evaluation and other requirements of the intake and exhaust valves, and to give the intake and exhaust valves:
Valve-specific technical requirements:
--- Part 5: Control valve: The purpose is to give the design, performance, consistency evaluation and other requirements of the control valve, and to give the unique characteristics of the control valve:
technical requirements:
Among them, GB/T 18691:1 specifies the general requirements for irrigation valves: Except for the common requirements of general requirements, the rest of the standards are based on the general requirements of irrigation valves:
The category specifies the specific technical requirements for this type of irrigation valve:
Based on GB/T 18691:1, GB/T 18691 completely gives four types of agricultural products including isolation valve, check valve, intake and exhaust valve, and control valve:
The technical requirements and evaluation methods of industrial irrigation valves provide a standard basis for the manufacture and product upgrading of agricultural irrigation valves:
Agricultural irrigation equipment irrigation valve
Part 2: Isolation Valves
1 Scope
This document specifies the design requirements, performance requirements, conformity assessment, marking and packaging of isolation valves: The isolation valve is suitable for water temperature not exceeding
above 60°C and the water may contain certain types and concentrations of fertilizers or chemicals commonly used in agriculture:
This document applies to irrigation isolation valves with a nominal size of not less than DN8: The design working states of the isolation valve are fully open and fully closed, but also
It can work for a long time in any intermediate state:
2 Normative references
The contents of the following documents constitute essential provisions of this document through normative references in the text: Among them, dated citations
documents, only the version corresponding to that date applies to this document; for undated references, the latest edition (including all amendments) applies to
this document:
GB/T 18691:1-2021 Irrigation Valves for Agricultural Irrigation Equipment Part 1: General Requirements (ISO 9635-1:2014, IDT)
ISO 9644 Test method for pressure loss of irrigation valves in agricultural irrigation equipment (Agriculturalirrigationequipment-
Pressurelossesinirrigationvalves-Testmethod)
3 Terms and Definitions
The terms and definitions defined in GB/T 18691:1-2021 and the following terms and definitions apply to this document:
3:1
Through valve clearwayvalve
A valve designed with a non-clogging flow path that allows the passage of a sphere with a diameter not smaller than the inner diameter of the end port of the valve body:
[Source: EN736-3]
3:2
flow coefficient flowcoefficient
KV
The flow rate when water at a temperature of 5°C to 50°C passes through the valve and generates a static pressure (hydrostatic head) loss of 0:1MPa:
Note 1: Q=KV Δp
where:
Q---flow, in cubic meters per hour (m3/h);
Δp---pressure drop, the unit is 0:1 MPa (0:1MPa):
Note 2: 1bar=0:1MPa=105Pa; 1MPa=1N/mm2:
[Source: EN736-3, with modifications]
3:3
full bore valve fulborevalve
The valve seat diameter is not less than 90% of the inner diameter of the end port of the valve body:
[Source: EN736-3]
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