Single Flap Check Valve | Single Plate Check Valve | Flap Wafer Check Valve | SS316 PN16

What is a Flap Wafer Check Valve?

A Flap Wafer Check Valve, also known as a Single Flap Check Valve or Single Plate Check Valve, is a non-return valve designed with a single swinging disc that automatically prevents reverse flow in piping systems.

The valve operates solely by the flow pressure. When the fluid flows in the correct direction, the disc opens. Once the flow stops or reverses, the disc closes immediately, protecting pumps, pipelines, and other equipment from backflow damage.

This type of valve is widely used in:

• Water treatment systems

• Food and beverage processing

• Pharmaceutical plants

• HVAC systems

• Chemical processing

• Oil and gas industries

• Compressed air systems

• Marine applications

• Industrial process piping

Technical Specifications

Valve Construction

The valve consists of the following main components:

• SS316 Valve Body

• SS316 Swing Disc

• Viton or EPDM Seat

• Hinge Pin

• Retaining Pin

Its compact structure ensures reliable operation, minimal maintenance, and long service life.

Working Principle

The valve operates automatically without external power.

• When fluid flows in the forward direction, the pressure pushes the disc open.

• The fluid passes through the valve with minimal pressure loss.

• When the flow stops or reverses, the disc closes immediately.

• Reverse flow is effectively prevented, protecting the entire piping system.

Advantages

• Compact and lightweight design

• Easy installation between flanges

• Maintenance-free operation

• Excellent corrosion resistance with SS316 construction

• Reliable sealing with Viton or EPDM seat

• Low pressure drop

• Long service life

• Suitable for various industrial applications

• Cost-effective solution

Applications

Flap Wafer Check Valves are widely used in:

• Water supply systems

• Wastewater treatment plants

• Chemical processing

• Food and beverage industries

• Pharmaceutical manufacturing

• HVAC systems

• Fire protection systems

• Power plants

• Marine engineering

• Industrial piping systems

Price List – Flap Wafer Check Valve SS316 PN16

Note: Prices are exclusive of VAT and may change without prior notice. Please contact us for the latest quotation and project discounts.

Why Choose PM-E?

• High-quality imported products

• Full Certificate of Origin (CO) and Certificate of Quality (CQ)

• Competitive pricing

• Fast nationwide and international delivery

• Professional technical support

• Large inventory available

• Warranty according to manufacturer standards

• Experienced industrial valve supplier

Frequently Asked Questions (FAQ)

What is the difference between a Single Flap Check Valve and a Dual Plate Check Valve?

A Single Flap Check Valve uses one swinging disc, offering a simple design, reliable sealing, and low maintenance. A Dual Plate Check Valve uses two spring-loaded plates, making it more suitable for larger pipe systems with faster closing action.

Can this valve be used for chemical applications?

Yes. The SS316 body and disc provide excellent corrosion resistance, while Viton seats offer compatibility with many chemicals and oils.

Which flange standards are supported?

The valve is designed for installation between PN10, PN16, and ANSI Class 150 flanges.

What sizes are available?

Standard sizes include DN50, DN65, DN80, DN100, DN125, DN150, DN200, DN250, and DN300.

Contact Us

If you are looking for a reliable Flap Wafer Check Valve, Single Flap Check Valve, or Single Plate Check Valve, PM-E is your trusted supplier.

Contact us today for:

• Fast quotations

• Technical consultation

• Project pricing

• OEM and bulk orders

• Worldwide shipping

YOY Closed Spring Loaded Low Lift Type Safety Valve

Overview of YOY A41H / A41Y Safety Valve

The YOY A41H and A41Y Series Safety Valve is a closed spring-loaded low lift safety valve designed to provide reliable overpressure protection for industrial equipment, pipelines, pressure vessels, and utility systems.

Manufactured according to Chinese National Standards, this valve is widely used in petroleum gas, compressed air, water, steam, and other industrial fluid applications.

The low lift design offers stable operation, accurate pressure relief performance, and long service life, making it an ideal solution for medium and high-pressure systems.

Key Features

Closed Spring Construction

The spring mechanism is enclosed inside the bonnet, providing:

• Better protection against environmental contamination
• Improved corrosion resistance
• Stable operating performance
• Extended service life

Low Lift Design

The low lift structure offers:

• Precise pressure relief
• Stable opening and closing performance
• Reduced vibration during operation
• Suitable for gas and liquid service

Excellent Sealing Performance

The valve seat and disc are hard-faced with Stellite alloy to provide:

• Long-term sealing reliability
• Superior wear resistance
• Corrosion protection
• Reduced maintenance requirements

Wide Material Selection

Available in:

• Carbon Steel (WCB)
• Stainless Steel 304
• Stainless Steel 316

to suit different process conditions and media.

Technical Specifications

Materials of Construction

A41H-C Series (Carbon Steel)

Suitable for general industrial services.

Main materials:

• Body: WCB Carbon Steel
• Disc: 2Cr13 Stainless Steel
• Stem: 2Cr13 Stainless Steel
• Spring: 50CrVA Alloy Steel

A41Y-P Series (SS304)

Suitable for mildly corrosive media.

Main materials:

• Body: Stainless Steel 304
• Disc: Stainless Steel 304
• Stem: Stainless Steel 304
• Spring: Teflon-Coated 50CrVA

A41Y-R Series (SS316)

Suitable for corrosive process applications.

Main materials:

• Body: Stainless Steel 316
• Disc: Stainless Steel 316
• Stem: Stainless Steel 316
• Spring: Teflon-Coated 50CrVA

Applications

The YOY A41H / A41Y Safety Valve is widely used in various industrial sectors:

Water Treatment Systems

• Water pipelines
• Water storage tanks
• Pump stations

Compressed Air Systems

• Air compressors
• Air receivers
• Pneumatic systems

Petroleum & Gas Industry

• LPG systems
• Fuel gas pipelines
• Storage facilities

Chemical Plants

• Process piping
• Pressure vessels
• Utility systems

Manufacturing Facilities

• Industrial utilities
• Production process lines
• Equipment protection systems

Advantages of YOY Low Lift Safety Valve

✔ Accurate pressure relief performance

✔ Reliable overpressure protection

✔ Compact and robust construction

✔ Closed spring design

✔ Excellent sealing capability

✔ Carbon steel, SS304 and SS316 options

✔ Easy maintenance

✔ Long service life

✔ Competitive pricing

✔ Suitable for gas and liquid applications

Difference Between A41 Series and A42 Series

Why Choose THEGIOIVAN.NET?

THEGIOIVAN.NET supplies genuine YOY Safety Valves with full technical support, pressure setting consultation, sizing assistance, and competitive pricing.

Our engineering team can help customers select the correct valve size, pressure rating, material, and set pressure based on project requirements.

Contact Information

THEGIOIVAN.NET

Industrial Valve & Instrument Specialist

📧 Email: info@pm-e.vn

☎ Hotline:

• +84 902 601 875
• +84 902 720 814
• +84 907 450 506
• +84 979 737 351

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