A check valve, also known as a non-return valve (NRV) or one-way valve, is a device designed to allow fluid (liquid or gas) to flow in only one direction. Simply put, it ensures unidirectional flow and automatically prevents backflow when the fluid in the line reverses direction.
Check valves are unique among self-automated valves, as they do not require external assistance to open or close. Unlike other types of valves, they remain operational even if a facility loses power, air supply, or the personnel responsible for manual operation.
Operating independently, check valves are typically not controlled by a person or external mechanisms, meaning they often lack handles or stems. These valves are commonly found in both residential and industrial settings. For example, a sump pump in a home's basement likely has a check valve in its discharge line. Beyond the home, check valves are vital in industries where pumps are an integral part of operations.
With a wide variety of types available, check valves are suited to diverse applications. Regardless of the specific design, their primary function remains the same: preventing reverse flow efficiently and reliably

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.

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.

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TVCCL Valves Catalogue

Catalogue for TVCCL valves

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Dual Plate Wafer Style Check Valve Installation and Maintenance Instructions

Installation and Maintenance Instructions for dual plate check valve

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Drawing for dual plate wafer type check valve A536 65 45 12 DI DUCTILE IRON BST

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Drawing for dual plate wafer type check valve WCB CF8 CF8M 900LB 1500LB 2500LB

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Drawing for dual plate wafer type check valve WCB CF8 CF8M PN10 PN16

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FAQ

Q.What Is Check Valve?

TVCCL Check Valve is a dual plate check valve that conforms to API 594. TVCCL is known as one of the leading manufacturers of Valve in Taiwan since we established.A...

Q. How Do Install Double Disc Check Valve In Pipe?

Taiwan Valve Centre Co.,Ltd. is the professional dual check valve manufacturers in the Taiwan. This information concerning the installation and operation...

Q. What Kind Of Material TVCCL Stock For Dual Check Valve?

Materials Stocked for Dual Plate Check Valve by TVCCLTVCCL, a pioneer in valve manufacturing, has been at the forefront of the industry since 1998. Our expertise...