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. Usually with a wafer check valve, there is a minimum back-pressure requirement restriction, which means it may have some seepage in the closed position and allow some backflow.
Dual plate check valve 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.
Dual plate check valves have two discs in the body, work automatically and a person or any external control does not control most. There are various types of check valves to use in a wide variety of applications.

Features

• Dual plate check valves is simple and compact, long life and high reliability.
• Variety of Body Designs Available - Wafer Type, Lug Type ,Double Flange Type and Soild lug type.
• Wafer body valves are designed with flangeless bodies with short face-to-face dimensions per API 594
• Duo check Valves are clamped between mating flanges which are connected by studs(bolt) and nuts.
• Water Hammer Prevention.
• Non Slamming.
• Simplicity installation.
• Abundance inventory and fast delivery.
• Retail acceptable.
• Many special material can be chosen, basically, we usually have CI/DI/WCB/CF8/CF8M material, besides of that, if you need CF3M/ Duplex/Super Duplex, we have some of it in stock. On the other hand, we can do CN7M/ Monel/ Hastelloy C etc.…, however, depend on your quantity, it will need MOQ probability.
• Beautifully packaged:
• Small size packed by carton box, and show material clearly outside
• Big size packed by special plastic wrap, reduce the impact to a minimum.
• Customized special valve.
• Nonscheduled development and design new type.

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: 1.5" ~ 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
• Another Flange Standard: BS10 TABLE E / AS2129 TABLE E / AWWA C207
• 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.

PRESSURE - TEMPERATURE RATING

The pressure-temperature rating table is an essential technical reference in the design and selection of industrial valves. It indicates the maximum allowable working pressure that a valve made from a specific material can withstand at various temperatures. According to the ASME B16.34 standard, this table is based on the mechanical properties and allowable stress of materials, listing pressure limits for different pressure classes (such as Class 150, 300, 600, etc.) at designated temperatures. These values are calculated by considering the reduction in material strength at elevated temperatures, ensuring that valves do not fail due to overpressure or overheating under actual operating conditions. When selecting a valve, users must first determine the operating temperature and then consult the table to verify whether the corresponding pressure class can safely handle the system pressure. The table also categorizes materials into groups—such as carbon steel, stainless steel, and alloy steel—since each material behaves differently under high temperatures, and the allowable pressures vary accordingly. In summary, the pressure-temperature rating table is a fundamental tool for ensuring valve safety. For engineers, it serves not only as a design reference but also as a critical component of risk management.

CV PRESSURE DROP FORMULA

The Cv and Kv values are essential parameters used to evaluate the flow capacity and pressure drop characteristics of a valve. The Cv (Flow Coefficient) represents the flow rate of water, in U.S. gallons per minute, that passes through a valve with a pressure drop of 1 psi. The Kv value is the equivalent metric unit, indicating the flow rate in cubic meters per hour at a pressure drop of 1 bar.
These coefficients are crucial for valve selection, system design, and performance evaluation, ensuring optimal flow efficiency and accurate pressure control. The provided chart helps engineers determine the appropriate valve size and model according to flow conditions, pressure, and medium type.

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 variety of materials to suit different media properties, temperature ranges, and pressure conditions. Common soft-sealing materials include EPDM, NBR, and FKM (Viton®).

EPDM is ideal for cooling water, potable water, and general water treatment systems.

NBR is suitable for oils, air, and other neutral media.

FKM offers excellent resistance to high temperatures and chemicals, making it suitable for chemical and petrochemical applications.

For high-temperature, high-pressure, or abrasive service conditions, metal-seated options such as stainless steel or Stellite 6 alloy are recommended to ensure greater wear resistance and structural strength.

Selecting the correct seat material is crucial—not only to achieve reliable sealing performance but also to extend valve service life and maintain stable system operation.

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.

Applications

• Dual plate check valves widely used for the basic piping, water, and various piping. For example, Fossil, Nuclear Cogeneration Power. Refining. Pulp & Paper. Mining. Marine. Petrochemicals. Offshore. LNG Cryogenics. Water. Wastewater. Chemical. Aerospace industry. Power Plant. Solar power industry. Reservoirs. TVCCL Dual-plate check valves which can be used in many fields with different uses.
• Dual Plate check valves are also available for general residential use, such as high buildings, apartment, agricultural irrigation, water pipelines, compressors, blowers, pumping pumps, filters, dryers, chillers, boiler systems, refrigerating air conditioning systems, ventilation pipes, pumping motors, sewage, power stations, electronics factories, fire equipment, chemical research, medical equipment, laboratory, ship yachts, major domestic and foreign engineering, factories, etc.
• Double plate check valve, a multi-purpose check valve, can be flexibly mounted on horizontal and vertical piping without any impact.

More Knowledge about TVCCL valve:

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:

Cast Iron, price is inexpensive, with ordinary strength and good machinability.
Applicable to the water fluid and normal temperature environment.
The dual Plate Check valve is an automatically opened valve that only allows the medium to flow in the same direction and prevents reverse flow. Automatically open and close when there has pressure generated, no need to handle or other actuation control. Under the action of the pressure flowing in the same direction, the discs are opened, so that the medium can flow in the pipeline; conversely, when the medium flows in the opposite direction, the pressure generated by the medium and the weight of the valve discs act on the seat. When the valve is closed, the check valve will cut off the flow, thereby achieving the effect of backstop and media backflow. Its main function is to prevent backflow of the medium, prevent the pump and drive motor from reversing, and release the container medium. TVCCL's check valve is quickly closed due to the valve flap, which can quickly achieve the effect of the backstop and can effectively reduce the occurrence of water hammer.

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