For rubber test, we have Pinhole test machine, also do self-test if require.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

• Internal with full rubber.
• Suitable for Sea Water or High concentration brine.
• The valve internal body is covered with rubber, in order to reduce the chance of valve leakage due to corrosion effect, and the valve body can choose DI to achieve cost down.
• Basically, the valve which is used in seawater, our recommendations as follows: Body: DI, Disc: C95800, Seat EPDM.
• Low cost (for some special fluid).
• Non Slamming.

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" (DN50 - DN1500)
• Pressure Rating For ASME: 125# ~ 600# 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
• Designed in accordance with API 594
• (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

• 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:

Cast Iron, price is inexpensive, with ordinary strength and good machinability. Applicable to the water fluid and normal temperature environment.
The Dual plate wafer type check valve with full rubber, as the name implies, it is the wafer type check valve which lined the rubber inside the body, also known as a full lining check valve. Full rubber check valve is lined with rubber, which has a better waterproof and slip-proof effect than the other valves. Without any leakage under normal circumstance. Commonly used in environments with high salinity content, desalination or coastal areas. Due to the insulating function of the rubber material, it has become the first choice for users of the above-mentioned environment. Full rubber check valve’s body is covered with rubber, so the valve body material can be selected from the lower price, such like DI material or WCB material, and the price is lower than AL-BRONZE or Duplex and Super Duplex Stainless Steel.

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