Flanged joints are made by bolting together two flanges with a gasket between them to provide a seal.
Flange type valves are provided with thru-hole bolting in accordance with API 594,ASTM,JIS,ISO.
Wafer check valves look a lot like butterfly valves at first glance. They are narrow, which makes them great when there isn’t enough room for a bulky valve.
Rubber seat usually use in sea water. The inner body is full covered by rubber. Compared to other check valves, this design owns the better watertight effect.

Features

• Flange type check valve's bolt hole no tapping, it decrease cost on machining.
• Disassemble easily.
• Full rubber type 0 leakage.
• Body with full rubber lined can effectively reduce disc's leakage probability for the corrosion of sea water.

Dual Plate Check Valve Installation Guide:

When installing a check valve, it can be used in both indoor and outdoor environments. However, if the medium is corrosive or the surroundings are prone to rust, it is essential to select a valve material combination that matches the conditions to ensure durability and safety. For special operating conditions, it is recommended to consult TVCCL’s technical team for professional advice.
Before installation, all debris, oxidation scale, and solid impurities inside the pipeline should be thoroughly removed to prevent interference with the valve’s operation. During installation, the flow direction of the medium must align with the arrow marked on the valve body. The piping should be aligned at the front and rear centers, with flange interfaces kept parallel and bolts evenly tightened. Special attention should be paid to the distance between the check valve and the pump, which should be six to eight times the valve size to ensure stable system performance.
For routine maintenance, regular inspections should be conducted to check for leakage, abnormal noise, or vibration. In addition, the valve should be periodically examined for signs of corrosion, jamming, or other irregularities. Necessary cleaning, dust removal, and residue treatment should be performed to maintain proper equipment operation and extend its service life.

Specification

• Size: 8" ~ 60" (DN200 - DN1500)
• Pressure Rating For ASME: 125# ~ 2500# Suit For ASME / MSS / API Flange
• Pressure Rating For ISO: PN10 ~ PN40 Suit For ISO Flange
• Pressure Rating For JIS: 5K ~ 20K Suit For JIS Flange
• Material:CI,DI,WCB,CF8,CF8M,ALBC3,A8904A(MOQ)
• Designed in accordance with API 594
• End Connection: Wafer, Lugged (TC6, TC9), Flanged (TC4)
• (Other flange connection please contact Taiwan Valves Centre Co., Ltd.)
• *Technical information is only for reference. Taiwan Valves Centre Co., Ltd. reserves the right to change without previous notice.

SELECTION GUIDE

1. Clarify Application Requirements and System Conditions
Begin by thoroughly assessing the environment in which the valve will operate. Key considerations include:
• Type of fluid — Is the medium water, oil, gas, slurry, or a corrosive chemical?
• Operating parameters — What are the system’s maximum pressure and temperature?
• Flow behavior — Is there a risk of sudden flow reversal or water hammer?
• Space limitations — Is the piping layout compact or spacious?
These factors help identify the most suitable valve materials and configurations for your system.
2. Select Materials Based on Fluid and Environment
The valve’s body and internal components must withstand corrosion and wear caused by both the fluid and the surrounding conditions. Common material choices include:
• Stainless steel — Excellent for corrosive or sanitary applications.
• Carbon steel or cast iron — Suitable for general-purpose use with non-aggressive media.
• PVC or engineered polymers — Ideal for low-pressure, non-corrosive systems.
Avoid incompatible combinations—such as using brass or mild steel with aggressive chemicals—as this may result in premature failure.
3. Choose the Correct Size and Pressure Rating
Valve sizing should align with the pipe diameter and expected flow rate:
• Proper sizing minimizes pressure drop and prevents turbulence.
• Ensure the valve’s pressure and temperature ratings exceed system requirements to maintain safety and reliability.
4. Evaluate Valve Dynamics and Performance Characteristics
Different wafer check valve designs offer distinct advantages depending on system demands:
• Spring-loaded or dual-plate wafer valves — Provide quick, silent closure to prevent water hammer in high-cycle operations.
• Standard single-plate models — Adequate for slow, steady flow in simpler systems

Seat Material Options for Dual Plate Check Valves

The seat of a dual plate check valve is available in a wide range of materials to meet various media properties, temperature ranges, and pressure conditions. Selecting the right seat material is essential to ensure reliable sealing performance, extended service life, and stable system operation.

Soft Seat Options:
Soft-seated designs provide excellent sealing performance and are typically made from rubber materials such as EPDM, NBR, or FKM (Viton®).

EPDM – Ideal for cooling water, potable water, and general water treatment applications.

NBR – Suitable for oils, air, and other neutral media.

FKM (Viton®) – Offers superior resistance to high temperatures and aggressive chemicals, making it ideal for chemical and petrochemical industries.

Metal Seat Options:
For high-temperature, high-pressure, or abrasive conditions, metal seats are recommended to ensure enhanced durability and wear resistance.
Metal seats can be manufactured from the same material as the valve body or from stainless steels such as SS304, SS316, SS410, or hard alloys like Stellite 6. The allowable leakage rate for metal seats varies depending on valve size.

For any special rubber material requirements, please feel free to contact us.

HEAD LOSS

Head loss refers to the loss of a fluid’s total energy (or pressure) as it flows through pipelines or valves, caused by factors such as friction, turbulence, changes in flow direction, and resistance within the flow path. In a dual-plate check valve, head loss is the pressure drop that occurs when the fluid passes through the valve plates and internal structure.

The smaller the head loss, the lower the resistance the fluid encounters when passing through the valve, the higher the flow efficiency, and the less energy is dissipated. This reduces the system’s pumping energy consumption and improves overall operational efficiency. Conversely, larger head loss indicates greater flow resistance and requires the pump to expend more power to maintain the desired flow rate. Therefore, analyzing head loss data is an important step in valve selection to ensure system efficiency, pressure control, and economic performance.

Dual Plate Wafer Type Check Valve Operation

When fluid flows in the forward direction, the pressure of the medium pushes the two plates open around the hinge pin, allowing smooth passage with minimal resistance. As the flow velocity decreases, the torsion springs automatically begin to act, gently returning the plates toward the body seats. This design minimizes the distance and time required for closure.
When flow reversal occurs, the plates are already near the seat, enabling the valve to close quickly and securely. This rapid dynamic response significantly reduces the water hammer effect, ensuring quiet, non-slam performance and protecting the system from pressure shock and vibration.

Advantages of Dual Plate Check Valves

Dual plate check valves offer several advantages that make them ideal for modern piping systems. Their compact and lightweight wafer design allows easy installation between flanges, saving both space and weight. The two spring-loaded plates close rapidly when flow decreases, effectively preventing backflow and minimizing water hammer.
Because of their simple structure and few internal components, dual plate check valves require minimal maintenance and provide reliable automatic operation without external power or manual control. They are available in a variety of materials and configurations, making them suitable for water treatment, HVAC, marine, power generation, and industrial fluid systems.

Functions of Dual Plate Check Valves

The primary function of a dual plate check valve is to prevent backflow and ensure that fluid flows in one direction only. Its two spring-loaded plates respond quickly to changes in flow, closing rapidly when flow reversal occurs to protect pumps, compressors, and other equipment from damage.
In addition to backflow prevention, dual plate check valves help maintain system pressure stability, minimize water hammer through non-slam operation, and improve overall energy efficiency. Their compact wafer-type design allows for easy installation and reliable performance across water treatment, HVAC, marine, power generation, and industrial pipeline systems.

Applications

• Flange type dual check valve with full ruber lined is suitable for a country, which have high frequency earthquake. Alternatively, pipe has violently impact and shake often.
• Flange dual plate check valves have two plate in the body, work automatically and most are not controlled by a person or any external control.
• Double Flange check valve is designed to provide a cost-effective solution to your flow control and product shut-off requirements
• Dual plate flange-type valve used in many general applications such as in water distribution, water treatment, dams, power plants and in many other.
• A double flanged valve suited for heavy duty services such as shipbuilding and wastewater plants.
• Flange type check valve can be applied to Chemical, petrochemical industry.
• Dual flange type check valve suitable for Mineral-oil industry
• Double flange check valve used for Heating, air-conditioning, pipelines.
• Full rubber type check valve suitable for seawater, water, cooling water pipeline and…etc.
• The full rubber lined usually used in shipyard, ship plant, seawater desalination, seawater-cooling system.
• The rubber separate medium and the valve of body in order not to contact directly. The full lining type check valve can be used for high concentration brine or acidic medium.
• Full lining type check valve widely applied for water conservancy facilities, sewage treatment plants, and industrial or residential construction industries.
• Dual plate wafer type check valve with full rubber can suitable for pump, sewerage, and reservoir flood control, etc.
• Used in waterproof systems, discharge system, pump, etc.

More Knowledge about TVCCL valve:

TVCCL full rubber type check valve’s material is divided into two choices, NBR and EPDM. Before use, you must pay attention to the temperature of the medium and whether there is a granular object in the medium. Because the rubber can't afford the high temperature and low temperature as well, it is recommended to use it at normal room temperature to avoid the rubber falling off or deforming; and owing to the rubber is unbearably worn, It is not recommended to use the full-rubber type check valve in the cement or the medium which has the presence of particulate matter in pipelines. The installation method is the same as the dual plate check valve. The only difference is that the flange surface of the full rubber type check valve is also covered with rubber, so it is not necessary to add a gasket to fix it.
The Full Rubber type check valve’s inner covering rubber, the medium and the body material are not in direct contact, and the rubber is separate into the medium and the valve body material, thereby achieving the acid resistance and corrosion resistance. The Full rubber type check valve body internal adopts an all-rubber design, which is not easily deposited or produced. And it also reduces the maintenance cost, but the disadvantage is that the rubber is not suitable to keep for a long-time in outside, even if the quality of the rubber is high, the aging phenomenon cannot be avoided.

More Knowledge about dual plate check valve:

Double flanged Type are offered as standard on larger size valves where the lay length of the body permits installation of two nuts between the flanges. Flange type check valve is installed between two flanges using a separate set of bolts for each flange. This setup permits either side of the piping system to be disconnected without disturbing the other side. Flange Type Check Valve with two discs permits installation in a piping system in same manner as any conventional double flanged valve, i.e. studs and nuts per flange; this is one of the easiest connections to be installed or uninstalled from a pipeline. As Double flanged Type Check Valves are fastened to the pipe flanges, assembling or disassembling them is quick and easy. An important point to be mentioned about Double Flange types of end connections is that they are secured with several bolts. Flanged connections are the most common method of connecting valves, regardless of the pressure level (from low to high pressure levels) and valve size (from small to large valves). Flange dual plate check valves work automatically and it is not controlled by a person or any external control. Double flanged Type is offered as standard on larger size valves where the lay length of the body permits installation of two nuts between the flanges. Flange type valves are provided with thru-hole bolting in accordance with API 594, and if you have another standard demand, please send the inquiry to TVCCL.

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