A42H Spring Loaded Safety Valve, Design Standard API 520 / API 526 / API 2000
BRIFE INTRODUCTION
Safety valve is a valve which automatically, without the assistance of any energy other than that of the fluid concerned, discharges a quantity of the fluid so as to prevent a predetermined safe pressure being exceeded.
A42Y-C type with carbon steel body is used for the equipment and pipeline of the air, petroleum gas, liquid etc. The working temperature is bellow 300℃.
A42Y-P type and A42Y-R type with stainless steel (SS304, SS316) body are used for the equipment and pipeline of the quality with corrosive medium The working temperature is bellow 200℃.
The valve is automatically discharge a quantity of the fluid so as to prevent a predetermined safe pressure being exceeded, and which is designed to re-close and prevent further flow of fluid after normal pressure conditions of service have been restored, it is very important over-pressure protection system in operation.
STRUCTURE AND PARAMETER
NO. | Name of part | HFA42Y-C Material | HFA42Y-P Material | HFA42Y-R Material |
1 | Nozzle | 2Cr13/SS304 | A351-CF8 | A351-CF8M |
2 | Body | A216-WCB | A351-CF8 | A351-CF8M |
3 | Adjusting ring | 2Cr13/SS304 | SS304 | SS316 |
4 | Disc holder | 2Cr13/SS304 | SS304 | SS316 |
5 | Disc | 2Cr13/SS304 | SS304 | SS316 |
6 | Guide sleeve | 2Cr13/SS304 | SS304 | SS316 |
7 | Bonnet | WCB | SS304-450 | SS316 |
8 | Spring | 50CrVA | 50CrVACoated Teflon | 50CrVA/ Inconel |
9 | Stem | 2Cr13/SS304 | SS304 | SS316 |
10 | Adjusting bolt | 45 | SS304 | SS316 |
11 | Cap | ZG200-400 | SS304 | SS316 |
CODES AND STANDARDS
United States
ASME (American Society of Mechanical Engineers) Boiler & Pressure Vessel Code, Section I
ASME (American Society of Mechanical Engineers) Boiler & Pressure Vessel Code, Section VIII, Division 1
API (American Petroleum Institute) Recommended Practice 520 and API Standard 526, API Standard 2000 (low pressure - Storage tank
European Union
European standard steam boiler safety valveISO 4126 (harmonized with European Union directives) [5]
EN 764-7 (former CEN standard, harmonized with European Union directives, replaced with EN ISO 4126-1)
AD Merkblatt (German)
PED 97/23/EC (Pressure Equipment Directive - European Union)
China
JB/T308-2004 <Valves Code>
GB/T12241-2005 <Safety Valves’ Design, Manufacture and Test>
GB/T12243-2005 <Safety Valves’ Design, Manufacture and Test>
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