Wafer Type Check Valve Manufacturer & Supplier in India
A wafer type check valve, also known as a wafer check valve or wafer type non-return valve (NRV), is a compact and lightweight valve designed to allow fluid flow in one direction only while automatically preventing backflow when the flow reverses. Unlike traditional flanged check valves that require their own set of flanges and bolts, the wafer type check valve is designed to be installed directly between two existing flanges in a piping system, using the same stud bolts that hold the flanges together. This slim, wafer-style body eliminates the need for additional flange connections, resulting in significant space savings, reduced weight, and lower installation costs.
The wafer check valve operates through a simple yet effective mechanism. When forward flow pressure exceeds the cracking pressure, the disc or door swings open, allowing fluid to pass through with minimal resistance. As soon as the flow stops or reverses, the disc automatically closes under the force of backflow pressure. This automatic operation ensures silent and reliable shut-off without any external actuation. Wafer type check valves are widely used across water treatment, oil and gas, chemical processing, HVAC systems, power generation, pharmaceuticals, food and beverage, marine applications, and mining industries throughout India and worldwide.
How Does a Wafer Type Check Valve Work?
Understanding the working principle of a wafer type check valve helps engineers and procurement professionals select the right valve for their specific application. The valve operation can be broken down into three key phases.
Opening Phase: When fluid flows in the forward direction through the pipeline, the pressure of the flowing fluid acts against the valve disc. Once this forward pressure exceeds the valve’s cracking pressure (typically between 0.1 and 0.5 bar for most wafer check valves), the disc swings open on its hinge pin. In spring-assisted designs, the spring is compressed as the disc opens. The angle of opening is proportional to the flow rate — higher flow rates push the disc further open, reducing flow resistance.
Flow-Through Phase: During normal operation, the disc remains fully or partially open depending on the flow velocity. The streamlined disc design minimizes pressure drop across the valve, ensuring energy-efficient operation. The pressure drop in a fully open wafer check valve is typically between 0.2 and 0.5 bar, depending on the valve size and flow rate. This low pressure drop is one of the key advantages of wafer check valves over other check valve types such as lift check valves or piston check valves, which typically have higher pressure drops.
Closing Phase: When the flow velocity decreases or reverses direction, the disc begins to close under the combined action of backflow pressure and the valve’s return mechanism (spring force in spring-loaded models, or gravity and backflow pressure in non-spring models). The disc seats against the body seat, creating a leak-tight seal that prevents reverse flow. The closing speed is designed to be fast enough to prevent significant backflow but controlled enough to avoid water hammer effects that could damage the piping system.
Always install the wafer check valve with the flow direction arrow on the body pointing in the direction of intended flow. The valve can be installed in horizontal or vertical upward flow pipelines.
Technical Specifications
| Parameter | Details |
|---|---|
| Size Range | 2″ to 24″ (DN50 to DN600) |
| Body Material | Cast Iron IS 210 Gr FG 200 / CF8 (SS304) / CF8M (SS316) |
| Disc Material | Stainless Steel 304 / Stainless Steel 316 |
| Seat Options | Metal-to-Metal / Nitrile / EPDM |
| Pressure Rating | ANSI 125 / DIN PN10 / PN16 |
| Design Standards | API 6D / API 594 / BS / DIN |
| End Connection | Wafer type (between flanges) |
| Applications | Water, Marine, Oil & Gas, HVAC, Chemical, Power, Pharma, Food & Beverage |
API 594 and API 6D Compliance
When sourcing wafer type check valves for industrial applications in India and for export markets, compliance with international standards is a critical selection criterion. Kelor Valves manufactures wafer type check valves that comply with two key American Petroleum Institute (API) standards: API 594 and API 6D.
API 594 — Wafer and Lug Check Valves: This standard specifically covers the design, material selection, manufacturing, inspection, and testing of wafer-type and lug-type dual plate and single plate check valves. API 594 defines face-to-face dimensions, pressure-temperature ratings, structural requirements for the body, disc, hinge mechanism, and seat, as well as mandatory pressure testing procedures including shell test and seat test requirements. Compliance with API 594 ensures that the valve meets internationally recognized quality benchmarks, making it acceptable for use in oil and gas, petrochemical, and power generation projects worldwide.
API 6D — Pipeline and Piping Valves: API 6D is a broader standard covering various types of pipeline valves including check valves, gate valves, ball valves, and plug valves. For wafer check valves, API 6D specifies requirements for pressure testing, end-to-end dimensions, material traceability, and documentation. Many industrial projects in India and internationally require API 6D compliance as a minimum qualification for valve suppliers. Kelor Valves provides API 6D-compliant wafer check valves with full material traceability and test certificates.
All Kelor wafer type check valves undergo rigorous shell testing at 1.5 times the rated pressure and seat testing at 1.1 times the rated pressure to ensure leak-tight performance. Test certificates are provided with every shipment upon request.
Material Selection Guide: CI vs SS304 vs SS316
Selecting the right body and internal material for your wafer check valve is essential for long-term reliability and performance. Kelor Valves offers three material options, each suited to different operating conditions and media types found in Indian and international industrial applications.
| Property | Cast Iron (CI) | Stainless Steel 304 | Stainless Steel 316 |
|---|---|---|---|
| Body Material | IS 210 Gr FG 200 | CF8 | CF8M |
| Corrosion Resistance | Moderate | Good (general purpose) | Excellent (chloride resistance) |
| Max Temperature | 200°C | 400°C | 400°C |
| Pressure Rating | PN10 / PN16 | PN10 / PN16 | PN10 / PN16 |
| Best Applications | Water, HVAC, general service | Chemical, food, pharma | Marine, offshore, aggressive chemicals |
| Relative Cost | Most economical | Moderate | Premium |
| Size Range | 2″ to 24″ | 2″ to 24″ | 2″ to 24″ |
Cast Iron (CI) Wafer Check Valve: The most cost-effective option, ideal for non-corrosive applications such as water distribution, HVAC chilled water systems, fire fighting systems, and general industrial piping. CI wafer check valves are the most commonly specified type in building services and water treatment plants across India due to their low cost and reliable performance for water-based applications.
SS304 Wafer Check Valve: Offers excellent corrosion resistance for a wide range of media including mild chemicals, food-grade liquids, pharmaceutical process fluids, and moderately aggressive industrial fluids. SS304 is the standard choice for food and beverage, pharmaceutical, and chemical processing applications in India. The chromium-nickel alloy composition provides a self-passivating surface that resists rust and staining.
SS316 Wafer Check Valve: The premium choice with superior corrosion resistance, particularly against chlorides, acids, and marine environments. SS316 contains molybdenum which enhances its pitting corrosion resistance, making it the preferred material for offshore platforms, desalination plants, chemical processing plants handling aggressive media, and marine applications. For any application involving saltwater, brine, or chloride-containing solutions, SS316 is strongly recommended.
Wafer Check Valve Dimensions (Face-to-Face)
The following table provides face-to-face dimensions for wafer type check valves as per API 594 and DIN standards. These dimensions are critical for piping engineers when designing spool pieces and determining installation clearances in industrial projects across India.
| Size (DN) | Size (NPS) | Face-to-Face (mm) | Approx. Weight (kg) |
|---|---|---|---|
| DN 50 | 2″ | 60 | 3 |
| DN 65 | 2.5″ | 67 | 4 |
| DN 80 | 3″ | 73 | 5 |
| DN 100 | 4″ | 98 | 8 |
| DN 150 | 6″ | 127 | 15 |
| DN 200 | 8″ | 146 | 25 |
| DN 250 | 10″ | 181 | 40 |
| DN 300 | 12″ | 216 | 55 |
| DN 350 | 14″ | 241 | 75 |
| DN 400 | 16″ | 267 | 95 |
| DN 450 | 18″ | 292 | 120 |
| DN 500 | 20″ | 318 | 150 |
| DN 600 | 24″ | 368 | 210 |
Dimensions are approximate as per API 594. Contact Kelor Valves for certified dimension drawings for your project requirements.
Installation and Maintenance Guide
Proper installation and regular maintenance of your wafer type check valve ensures optimal performance, long service life, and reliable backflow prevention throughout the valve’s operational life in industrial piping systems.
Installation Steps:
- Verify the valve size, pressure rating, and material match the piping system requirements before installation.
- Check that the flow direction arrow on the valve body matches the intended flow direction in the pipeline.
- Clean the flange faces thoroughly and ensure gaskets are properly positioned on both sides of the valve.
- Position the wafer check valve between the two flanges, aligning the bolt holes.
- Insert stud bolts through the flanges and valve body. Tighten nuts in a crisscross pattern to the recommended torque value.
- Do not over-tighten, as this can distort the valve body and prevent proper disc operation.
- After installation, perform a visual inspection and hydrostatic pressure test to verify leak-tight performance.
Maintenance Tips: Wafer type check valves are generally low-maintenance devices due to their simple mechanical design. However, periodic inspection is recommended: check for external corrosion or damage to the body, verify that the disc operates freely, inspect seat and disc contact surfaces during scheduled plant turnarounds, and replace gaskets whenever the valve is removed from the line. In applications with dirty or abrasive media, more frequent inspection may be required.
Troubleshooting: If the valve produces noise or vibration during operation, check for inadequate flow velocity (the valve may be oversized), verify proper alignment, and ensure no foreign objects are obstructing disc movement. If the valve does not close fully, inspect the seat and disc for wear or debris buildup, and check that the hinge pin is not bent or corroded.
Why Choose Kelor Valves?
Kelor Valves (Krishna Industries) is a trusted wafer type check valve manufacturer in India, supplying durable and efficient check valves for industrial, marine, and water applications. Our wafer check valves feature stainless steel internals and are designed to meet international standards including API 6D, API 594, ANSI 125, and DIN PN10/PN16.
- Reliable Indian Manufacturer: Direct factory production with 2000+ pieces/month capacity
- Fast Delivery: 5-10 working days for standard orders across India
- Factory-Direct Pricing: Starting from INR 150 per piece with bulk order discounts
- OEM Branding: Logo, color, marking, and packaging customization available
- International Standards: Compliant with API 6D, API 594, DIN, and ANSI standards
- Full Documentation: Material test certificates and pressure test certificates provided
- Global Export: Export-grade packaging and worldwide shipping support
Industrial Valve Application Industries
Oil & Gas
Wafer type check valves are used in oil and gas pipelines, refinery systems, and petrochemical plants to prevent backflow and protect downstream equipment from reverse flow damage.
Water & Wastewater
Widely deployed in water treatment plants, water distribution networks, and sewage systems across India for reliable backflow prevention in water supply lines.
Chemical Industry
SS304 and SS316 wafer check valves handle a wide range of corrosive chemicals, acids, and alkalis in chemical processing plants.
Power & Energy
Used in cooling water systems, boiler feed lines, and thermal power plant piping to prevent reverse flow and ensure system efficiency.
Food & Beverage
SS304 wafer check valves with food-grade seat materials are ideal for food processing, dairy, and beverage production lines.
Pharmaceuticals
Meets the stringent hygiene and material requirements of pharmaceutical manufacturing with SS316 construction and EPDM seats.
Mining & Metals
Handles abrasive slurries and high-pressure applications in mining and metals processing with robust cast iron and stainless steel body options.
HVAC & Building
The compact wafer design is ideal for HVAC chilled water, hot water, and heating systems in commercial and residential buildings across India.
Marine & Offshore
SS316 wafer check valves with superior corrosion resistance are the standard choice for marine applications, offshore platforms, and shipbuilding.
Steel & Automotive
Used in cooling water circuits, hydraulic systems, and process piping in steel plants and automotive manufacturing facilities.
Irrigation & Agriculture
Cost-effective CI wafer check valves are widely used in large-scale irrigation systems and agricultural water distribution networks in India.
Frequently Asked Questions
Do you offer OEM customization?
Yes, logo, color, marking, and packaging customization are available for all wafer type check valve orders.
What is the MOQ?
The minimum order quantity is 10 pieces per order for wafer type check valves.
Is the wafer type check valve suitable for marine or water applications?
Yes, with SS304/SS316 internals and EPDM or Nitrile seat options, the valve is fully suitable for marine, water, and wastewater applications.
Do you ship internationally?
Yes, Kelor Valves exports wafer type check valves worldwide with proper export-grade packaging and all required documentation.
Can I request material and pressure test certificates?
Yes, all shipments come with test certificates on request. We provide mill test certificates (MTC) as per EN 10204 3.1.
What is the delivery time?
Typically 5 to 10 working days depending on order quantity and material availability.
What sizes are most popular?
2″, 4″, 6″, and 8″ are the most demanded sizes globally and in India.
What standards are followed?
API 6D, API 594, ANSI 125, DIN PN10, and DIN PN16.
What is the return policy?
Defect-free replacement within 7 days of delivery for any manufacturing defects.
Do you provide samples?
Yes, samples are available. Freight for sample shipment is borne by the buyer.