The retainless design means that they do not drill completely through the body of the valve to enable installation of the hinge-pin and stop-pin of a dual-plate check. Instead of drilling through, they machine out a recess.
Dual plate check valve with retainerless are available in 4 basic types: Wafer, Lug, Solid Lug, Flanged end, and in an extensive range of sizes, pressure classes and materials. Material required other than standard upon request

Features

• High expansion coefficient, high temperature, and high pressure resistance.
• Suitable for use in high temperature environments, replacing the retainer with a carrier design to avoid abnormal leakage caused by high temperature.
• The appearance of the product is more beautiful than the general type
• Compared with the general type, the retainerless type without retainer is easier to disassemble, and faster and easier maintenance.
• Retainerless duo check Valves do not have any leakage problem on Body. Wafer type design fastens valve by bolt and flanges. Retainerless duo check Valves are clamped between mating flanges which are connected by bolt and nuts.

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: 2" ~ 60" (DN40 - 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 (TC8-2, TC8-3), Flanged (TC8-1)
• *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

• Retainerless dual check valve is suitable for high temperature and high pressure environment, like Petrochemical, Refinery or power plant.
• Use for any industry concerned with fire hazards or environmental safety
• Suitable for use in clean, dirty and sea water applications.
• Also use for gases like Chlorine, Hydrogen, Nitrogen, Carbon Dioxide (Co ), Oxygen etc.
• Retainerless type check valve can be installed in heating air-conditioning pipe lines.
• Installed in hydrocarbon and chemical processing.
• Retainerless Duo check Valve also can be used in steam/vapor applications.
• Retainerless dual check valve is a preferable option for highly toxic, corrosive, or hazardous gas chemical processing applications.
• Applied in Iron and steel industry.

More Knowledge about TVCCL valve:

TVCCL Retainerless wafer check valve body features a single cast body without penetration through the body wall, eliminating the possibility of outside leakage; making it a preferable option for High-temperature work environment. Under the normal using situation, TVCCL guarantee retainerless type valve does not have any leakage problem on Body. Dual plate check valve with retainerless are available in 4 basic types: Wafer, Lug, Solid Lug, Flanged end, and in an extensive range of sizes, pressure classes and materials.
TVCCL check valve made of selected materials, each valve we made can offer the material certificate which according to BS EN 10204 3.1. Under the normal using situation, we can guarantee the TVCCL valve is more durable than the other manufacturers. And the performance is more reliable and practical. Using check valve under normal situation all can achieve the non-return effect. However, if the pipeline installation distance is less than 6~8 times the size of the valve, the life of the check valve may be shortened or the valve body and parts may be damaged.

More Knowledge about dual plate check valve:

The Retainerless type is a type which body without pin retainer holes in the body. Retainerless type check valve use carrier and screw instead of retainer function to fix the pin. This design minimizes prospective leak paths through the valve body making it a preferable option for highly toxic, corrosive, or hazardous gas chemical processing applications. Retainerless valves are also suitable for high-temperature liquid, natural gas, steam service applications. Retainerless type check valve all inserts/parts are all the same as Dual plate check valve, except for using carrier and screw to replace the retainer. Simply, Dual plate check valve is drill four holes through the body of the check valve to facilitate installation of a hinge pin and stop pin, but Retainerless can be fixed by carrier and screw and is no need to drill the holes outside of valve’s body. Model: TC8 Wafer or Double Door Check Valves have no through holes. The Retainerless special to use in industry, especially offshore or onshore pipelines, there is a tremendous concern for fugitive emissions and potential environmental concerns. Retainerless check valve design also provides higher integrity on high pressure, ensuring no concerns about leakage.

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