3 Inch Flanged Check Valve
3 Inch Flanged Check Valve

3 Inch Flanged Check Valve

Our 3 Inch Flanged Check Valve is designed to prevent reverse flow in water supply, wastewater, fire protection, and industrial pipeline systems.

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Product Introduction

Product Overview

Our 3 Inch Flanged Check Valve is designed to prevent reverse flow in water supply, wastewater, fire protection, and industrial pipeline systems. The valve operates automatically using line pressure, providing reliable backflow protection while maintaining smooth flow performance with minimal pressure drop.

Constructed from high-strength ductile iron and protected by a heavy-duty fusion bonded epoxy (FBE) coating, it ensures long-term service and excellent corrosion resistance in demanding environments.

3 Inch Flanged Check Valve

Product Parameter

Parameter	Specification Details
Product Name	3 Inch Flanged Check Valve
Main Material	Ductile Iron (GGG40 / GGG50 / QT450-10)
Working Temperature	0℃ to 80℃(32℉ to 176℉ )
Custom size	DN50, DN65, DN80, DN100, DN125, DN150, DN200
Pressure Rating	Class 150LB
Working Medium	Water/Sewage
Color	Blue/Red
Applications	Used both vertically and horizontally;Used in one-way flow pipeline to prevent the water from back flow
Body	Ductile Iron,QT450-10
Crossbar/Stem	Stainless Steel 304
Disc	Ductile Iron covered by EPDM
Seal	NBR
Bolt	Stainless Steel 304

Core Performance

Cast from high-strength Ductile Iron (QT450-10) to deliver superior tensile strength and impact resistance, preventing cracking under water hammer.

The fully EPDM-encapsulated disc seals against a precision-machined seat, providing reliable sealing performance and helping reduce the risk of backflow leakage.

A streamlined internal body allows the disc to swing fully clear, maximizing flow capacity and minimizing pressure loss.

Over 250 microns of internal and external fusion-bonded epoxy (FBE) coating delivers dependable corrosion protection in water and wastewater.

Grade 304 stainless steel hinge pins and internal hardware prevent component seizing during long-term operational service.

Engineering & Selection Guide

Our standard data table reflects the full series range (DN50 to DN200) under our Class 150LB design platform.

3-Inch (DN80) Flange Compatibility Note:

This specific model features a multi-standard compatible flange drilling design to fit multiple international systems seamlessly:

For US/ANSI projects: Fits both Class 125 and Class 150 flanges.

For Global/EN projects: Aligns with standard PN16 dimensions.

For Other Sizes: Please explicitly state your required size (DN50-DN200) and specific flange standard (ANSI or PN16) in your RFQ. Our team will supply the matching CAD blueprint.

Technical Compliance & Quality Assurance

To support your engineering review, this valve series complies with the following international standards:

Design & Testing

Hydrostatic shell and seat tests conducted according to ISO 5208 / EN 12266-1.

Face-to-Face Dimensions

Compliant with ASME B16.10 / EN 558 Series 10.

Material Traceability

Standard EN 10204 3.1 Material Test Report (MTR) available upon request.

Warranty

18-month quality warranty from the date of shipment.

Package

Standard seaworthy plywood cases (ISPM 15 compliant).

FAQ

Q: Can this valve be installed vertically?

A: Yes, it functions reliably in both horizontal lines and vertical pipelines, provided the liquid flow direction is upward.

Q: Is the EPDM rubber safe for drinking water applications?

A: Yes, we use non-toxic, potable-grade EPDM. WRAS or NSF61 compliant material certificates can be provided upon request for drinking water projects.

Q: What is the exact pressure rating and testing standard for this valve?

A: While designed on a heavy-duty Class 150LB platform, the standard working pressure rating is certified for PN16 / Class 125 (232-250 PSI). Every individual valve undergoes strict hydrostatic shell (1.5 times design pressure) and seat (1.1 times design pressure) tests according to ISO 5208 / EN 12266-1 before packaging.

Q: Can we service the internal parts without removing the valve from the pipe?

A: Yes, the removable top bonnet allows direct access to the disc, arm, and pin for fast inline maintenance while the valve body remains bolted to the pipeline.

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