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Full Lift Open Safety Valves

Customization:	Available
Media:	Water
Certification:	ISO, CE

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Product Description

Basic Information

Model NO.

A48

Temperature

Ordinary Temperature

Connection

Flange

Pressure

Adjustable

Closed

Open

Structure

Spring

Material

Cast Steel

Color

Custom

Transport Package

Plywooden Case

Specification

1"~6"

Origin

China

HS Code

84814000

Capacity

10000set/Month

Product Description

Boiler Spring loaded full lift steam safety pressure relief valve with lever type

Performance Standards

The allowable tolerance of the set pressure: <+/-3% of the set pressure
Overpressure: <10% of the set pressure
Blowdown: <15% of the set pressure
Tightness: Valves have good seat tightness, conforms to API527

Key Features

Solid nozzle screws into the body for easy maintenance.
Disc holder designed to enhance fluid thrust effect for instant lift.
Blowdown control via adjustable nozzle ring.
Strict clearance control between disc holder, guide, and spindle ensures successful lifting.
Seating surfaces deposited with STL; precision machining and lapping for high seal tightness.
Balanced bellows design avoids back pressure effects and protects components from corrosive media.
Strict technological process for spring and bellows manufacturing with individual testing.

Technical Specifications

Type

Full lift safety valve, Angle type

Bonnet

Open bonnet for boiler

Inlet/Outlet

Flanged connection acc. to ANSI B16.5

Working Temp

Lower than 300°C

Compliance

API RP 520, API 526, API 527

Materials for Main Parts

NO	Name of Part	A48Y-C	A48Y-P	A48Y-R
1	Body	WCB	304	316
2	Nozzle	2Cr13/ 304	304	316
3	Adjusting Ring	2Cr13/ 304	304	316
4	Disc	2Cr13/ 304	304	316
5	Guide sleeve	2Cr13/ 304	304	316
6	Bonnet	ZG230-450	ZG230-450	ZG230-450
7	Spring	50CrVA	50CrVA + Teflon	50CrVA + Teflon
8	Stem	2Cr13	304	316
9	Adjusting bolt	45	2Cr13	2Cr13
10	Cap	ZG200-400	ZG200-400	ZG200-400
Sealing surface of material "Y" depositing stellite

Product Visualization

Inspection & Quality Control

Frequently Asked Questions

What is the set pressure tolerance for these valves?

The allowable tolerance of the set pressure is less than +/-3%, ensuring precise operation under pressure conditions.

Which industrial standards do these safety valves comply with?

Our valves are designed and manufactured according to API RP 520, with face-to-face dimensions following API 526 and testing conducted per API 527.

Are these valves suitable for high-temperature steam applications?

Yes, these boiler spring-loaded safety valves are suitable for gases, vapors, and fluids with working temperatures up to 300°C.

What materials are available for corrosive environments?

For corrosive media, we offer models A48Y-P (304 Stainless Steel) and A48Y-R (316 Stainless Steel) which include Teflon-coated springs for extra protection.

Can samples be provided for quality evaluation?

Yes, samples can be provided for testing and evaluation purposes upon request.

What is the typical delivery timeframe?

For stock items, delivery typically takes 5-7 days. For custom or non-stock orders, the timeframe is generally 15-20 days depending on the quantity.