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A42H Spring Loaded Safety Valve, Design Standard API 520 / API 526 / API 2000
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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


A42H Spring Loaded Safety Valve 

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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