Conventional Pressure Relief Valve (PRV), WCB, WCC, WC6, CF3, CF3M, CF8, CF8M

Name: Conventional Pressure Relief Valve (PRV), WCB, WCC, WC6, CF3, CF3M, CF8, CF8M
SKU: SJ-SJ-07
Availability: InStock
Rating: 5 (1 reviews)

Key Specifications / Features

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Detail Information

Conventional Pressure Relief Valve (PRV) Structure and Parameter:
Valve Design: ASME, API 526, GB/T 12243-2005
Material: A216-WCB, A216-WCC, A217-WC6, CF3, CF3M, CF8, CF8M.
Pressure Grade: 150Lb, 300Lb, 600Lb, 900Lb, PN16~PN320
Seal Test Pressure: 0.9PS
Discharge Pressure: ≤1.1PS
Back Seat Pressure: ≥0.85PS
Lift Height: ≥(1/4)do
Coefficient of Discharge: G-0.75
Connection Flange: ASME B16.5, GB/T 9113.1/2-2000.

safety valve Parts Materials

NO.	Name of part	HFA42Y-C Material	HFA42Y-P Material	HFA42Y-R Material
	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)
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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FAQs

low-emission valve packing vs. conventional valve packing

Low-emission packing systems are specifically engineered to minimize microscopic leakage along the valve stem, which is a common source of fugitive emissions in industrial plants.

Compared with conventional packing, low-emission designs achieve better performance through:

Higher material density control to reduce permeation paths

Pre-compressed or die-formed graphite rings for stable sealing stress

Optimized load distribution using live-loading spring systems

Improved surface finish compatibility with stem materials

These design improvements allow the packing to maintain consistent sealing force even under thermal cycling and vibration. As a result, leakage levels can be reduced to extremely low thresholds (often measured in parts per million), supporting compliance with environmental regulations and reducing operational losses.