Quality That Lasts.

A48H Spring Loaded Full Lift Safety Valve, Design standard ASME / API 526

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.

A48H/Y spring loaded full lift safety valve is open bonnet type which especially work for steam purpose, combined with boiler, steam pipe or other pressure vessel, it is usually high pressure and high temperature suitable, the valve is designed and manufactured according to ASME SectionⅠand Section Ⅷ.

A48H/Y spring loaded full lift safety valve usually applies with A216-WCB, A217-WC6 or even A217-WC9 as material, based on its working temperature. According to boilers design regulation, the safety valve installed on boiler (steam heater or heater drum) shall be full nozzle type, and open within 10% overpressure and close within 7%.

STRUCTURE AND PARAMETER

Valve Design: ASME, API 526, GB/T 12243-2005
Material: A216-WCB, A216-WCC, A217-WC6, A217-WC9

Pressure Grade: 150Lb, 300Lb, 600Lb, 900Lb, PN16~PN100
Seal Test Pressure: 0.9PS
Discharge Pressure: ≤1.03PS
Back Seat Pressure: ≥0.9PS
Lift Height: ≥(1/4)do FULL LIFT
Coefficient of Discharge: G-0.75
Connection Flange: ASME B16.5, GB/T 9113.1/2-2000

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>