4 Inch Flanged Check Valve
4 Inch Flanged Check Valve

4 Inch Flanged Check Valve

The 4 Inch Flanged Check Valve (DN100) is designed to prevent reverse flow in water supply, wastewater treatment, irrigation, cooling water, and fire protection systems.

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Product Introduction

The 4 Inch Flanged Check Valve (DN100) is designed to prevent reverse flow in water supply, wastewater treatment, irrigation, cooling water, and fire protection systems. Featuring a free-swinging ductile iron disc coated with EPDM rubber, the valve automatically opens under forward flow and closes tightly when flow reverses, protecting pumps, pipelines, and related equipment from backflow damage.

Its full-port design minimizes flow restriction, while the simple internal structure reduces maintenance requirements and ensures long-term operational reliability.

4 Inch Flanged Check Valve

Technical Specifications

Item	Specification
Product Name	4 Inch Flanged Check Valve
Nominal Size	DN100 (4 Inch)
Available Sizes	DN50, DN65, DN80, DN100, DN125, DN150, DN200
Pressure Rating	Class 150LB
Body Material	Ductile Iron (QT450-10)
Disc Material	Ductile Iron with EPDM Coating
Stem / Crossbar	Stainless Steel 304
Bolts	Stainless Steel 304
Seal Material	NBR
Working Temperature	0°C to 80°C (32°F to 176°F)
Suitable Media	Water, Sewage
Color Options	Blue, Red
Installation	Horizontal or Vertical (Upward Flow)

Product Construction

The valve is manufactured using durable materials selected for water system applications:

Valve Body

High-strength QT450-10 ductile iron provides excellent mechanical strength, impact resistance, and long service life.

EPDM-Coated Disc

The resilient EPDM-covered disc creates reliable sealing performance and reduces leakage risks during reverse flow conditions.

Stainless Steel Components

The crossbar, stem, and bolts are made from Stainless Steel 304 for improved corrosion resistance and durability.

NBR Seal

Provides dependable sealing performance for water and wastewater operating environments.

Typical Applications

Municipal water supply systems

Wastewater treatment plants

Irrigation networks

Cooling water circulation systems

Fire protection systems

Pump stations

Industrial water distribution pipelines

Quality Assurance

Every valve is inspected before shipment to ensure consistent quality and reliable field performance.
Available documents upon request:

Material Test Certificate (MTC)

Pressure Test Report

Inspection Report

Certificate of Origin

Packing List

Commercial Invoice

Third-party inspection services such as SGS, TÜV, BV, and Intertek can also be arranged according to project requirements.

Export Packaging

To ensure safe international transportation, valves are packed using:

Protective wrapping

Carton protection when required

Export plywood cases

Fumigation-free wooden crates

Palletized packaging for container shipments

FAQ

Q: What is the MOQ?

A: Trial orders from 1 piece are accepted, while larger quantities qualify for wholesale pricing.

Q: What payment terms do you accept?

A: T/T, L/C at sight, and other mutually agreed international payment methods are available.

Q: Which trade terms can you support?

A: EXW, FOB, CFR, CIF, and DDP can be arranged according to customer requirements.

Q: What is the lead time for production?

A: Standard orders are typically completed within 15–30 days depending on quantity.

Q: Can you provide OEM service?

A: Yes, custom logos, nameplates, colors, and packaging can be supplied.

Q: Can the valve be installed vertically?

A: Yes, vertical installation is possible when the flow direction is upward.

Q: What media is this valve suitable for?

A: It is designed primarily for water and sewage applications.

Q: What certificates can be provided?

A: Material certificates, pressure test reports, inspection reports, and certificate of origin are available upon request.

Q: Is third-party inspection available?

A: Yes, SGS, TÜV, BV, Intertek, or customer-designated inspectors can be arranged.

Q: What warranty do you provide?

A: Standard warranty is 12 months after installation or 18 months after shipment.

Q: How are the valves packaged for export?

A: Export-grade plywood cases or fumigation-free wooden crates are used to protect products during transportation.

Q: What industries commonly use this valve?

A: Municipal water supply, wastewater treatment, irrigation, cooling water, and fire protection systems are the most common applications.

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