Engineered for efficient flow isolation in municipal water distribution. Features a robust wafer body design and resilient sealing materials for reliable municipal service.
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Crucial for protecting municipal pipelines from air pockets and pressure surges. Automatically releases accumulated air to keep water networks operating smoothly.
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Designed to prevent backflow in municipal pumping stations. Features a fully rubber-encapsulated swing disc for quiet closure and long service life.
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Perfect for dead-end service and downstream system maintenance in municipal piping networks. Easy installation between standard flanges.
Learn More →Municipal pipeline projects form the absolute backbone of urban civilization, carrying clean drinking water, managing stormwater runoff, and safely disposing of wastewater. Historically, municipal networks relied heavily on traditional metal-to-metal seated gate valves. However, as global municipal infrastructure confronts the challenges of aging networks, rapid urbanization, and water scarcity, the demand has shifted dramatically toward soft seal gate valves (also known as resilient seated gate valves).
Unlike metal-seated valves, which are prone to leakage due to grit accumulation in the body recess, soft seal gate valves feature a flat-bottom bore and a fully rubber-encapsulated wedge. This design ensures 100% bubble-tight sealing by allowing foreign debris to pass through without compromising the valve's seal. As cities scale up their smart water management systems to reduce Non-Revenue Water (NRW), the adoption of zero-leakage soft seal gate valves has become a primary engineering standard worldwide.
Tianjin Tanggu Water-Seal Valve Co., Ltd. (TWS Valve) was founded in 2003 and has developed into a professional manufacturer integrating design, development, production, installation, sales, and service. Operating out of two state-of-the-art plants—one in Xiaozhan Town, Jinnan, Tianjin, and the other in Gegu Town, Jinnan, Tianjin—we have become one of China's leading suppliers of water management valve products and comprehensive flow control solutions. Over the past two decades, we have proudly built our own strong, globally recognized brand: "TWS".
TWS Valve operates on the core management philosophy: "All For Customers, All From Innovation". We constantly strive to enhance our market competitiveness, elaborately casting masterpieces with brand-new engineering concepts to define new standards in valves for water management.



In municipal pipe projects, the choice of materials determines the lifespan of the entire network. TWS soft seal gate valves are manufactured using premium ductile iron (GGG40/50 or ASTM A536), which provides superior tensile strength and impact resistance compared to cast iron. The stem is constructed from high-grade stainless steel (SS304/316/431) to prevent corrosion and galling. Furthermore, the internal and external surfaces are coated with fusion-bonded epoxy (FBE) coating (minimum 250 microns thick), which acts as an impenetrable barrier against microbiological growth and chemical corrosion, ensuring the safety of potable water transmission.
Features a universal standard flange connection and lightweight aluminum handle. The pinless connection between disc and stem makes it suitable for demanding municipal environments, including vacuum and desalination applications.
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Allows downstream pipelines and equipment to be safely repaired online. Can be easily installed on pipe ends as an exhaust valve, saving installation costs and offering compact 90-degree on-off operation.
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Designed with a centric disc and bonded liner, offering higher body strength and superior resistance to pipe pressure. Ideal as a safety factor in municipal water distribution mains.
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Wafer pattern with flanges conforming to EN558-1 20 series. The soft sleeve seat completely isolates the valve body from the fluid medium, simplifying maintenance and extending service life.
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Incorporates a positive retained resilient disc seal with low torque, high strength, and reduced weight. The eccentric action minimizes seat contact during operation, extending overall valve life.
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A premier wedge gate valve with a non-rising stem. Highly suitable for water and neutral liquid (sewage) pipelines. Features an integrated brass stem nut and thermal-clad rubber disc for tight sealing.
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Features dual torsion springs that close the plates quickly and automatically, preventing backflow and water hammer in municipal pumping systems. Can be installed horizontally or vertically.
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Mechanically removes unwanted solids from liquid, gas, or steam lines. Essential for protecting pumps, meters, and municipal control valves from dirt and rust damage.
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A key hydraulic balancing device designed for precise flow regulation in HVAC and municipal heating systems. Ensures static balance across the entire water network.
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Combines a high-pressure diaphragm air valve with a low-pressure inlet/exhaust valve. Automatically releases small pockets of air under pressure and allows high-volume exhaust during filling.
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A specialized water control device designed to strictly limit pipeline pressure and ensure one-way flow, preventing backflow contamination from sewage units to potable water networks.
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Modular 3D CAD designed manual actuator compatible with AWWA C504, API 6D, and API 600. Widely used for effortless opening and closing of large-diameter butterfly and ball valves.
See Product Details →Drinking water networks require the highest hygiene standards. Soft seal gate valves play a pivotal role in isolating sections of the grid for maintenance without introducing contaminants. The EPDM rubber used in TWS gate valves is certified by WRAS, ensuring it does not leach chemicals or alter the taste and quality of potable water. The smooth flow path prevents bacterial biofilm buildup, ensuring clean water delivery to residential areas.
Sewage contains suspended solids, organic matter, and abrasive particles. Traditional metal valves quickly fail in these environments as debris lodges in the seat cavity. TWS resilient seated gate valves feature a flat bottom that allows sewage sludge and grit to wash through. The robust NBR rubber wedge encapsulation resists oils, mild acids, and biological degradation, making them the preferred choice for primary and secondary treatment phases.
In municipal fire protection networks, valves must remain open for years but function flawlessly instantly in emergencies. Soft seal gate valves with indicator posts or OS&Y (Outside Screw and Yoke) designs are critical here. The resilient wedge ensures bubble-tight shutoff during maintenance, and the low operating torque allows quick manual or automated actuation during emergency firefighting operations.
High-rise buildings and district cooling systems operate under extreme static pressure. TWS high-pressure soft-sealed centerline valves are specifically engineered to handle elevated pressures while minimizing water hammer risks. Their low flow resistance helps reduce pumping energy costs, contributing to green building certifications and municipal energy efficiency goals.
TWS Valve's core products include a comprehensive series of resilient seated butterfly valves (wafer, lug, U-section, flanged concentric, flanged eccentric, and grooved end types), flanged rubber-seated gate valves, flanged swing-type check valves, dual plate check valves, and Y strainers. We continuously diversify our product range based on global water management requirements. Our latest innovations include balancing valves, air release valves, and backflow preventers. By designing and manufacturing our own IP67-rated gearboxes and electrical actuators, we guarantee optimal performance and seamless integration across all systems.
Our engineering expertise extends to specialized solutions:
With over two decades of manufacturing experience, TWS Valve has grown from a regional supplier into a trusted global brand in water management systems.
Our quality management system is fully certified under ISO 9001, and our products hold prestigious certifications, including CE and WRAS.
We have established "TWS" as a symbol of reliability, supplying high-performance valves for landmark projects across Europe, North America, Southeast Asia, and Africa.
TWS products are tested and approved by leading international classification societies and certification bodies:






TWS valves are widely utilized in critical municipal sectors, including water treatment plants, municipal distribution networks, wastewater systems, dams, hydropower facilities, power stations, and heavy industrial loops. Thanks to our high-quality manufacturing, competitive pricing, and professional service, our products have been integrated into landmark municipal projects nationwide and exported to Europe, North America, South America, Southeast Asia, and Africa. Consequently, TWS has become a trusted, long-term OEM/ODM partner for several world-famous valve brands.
We are dedicated to defining new standards in valves for water. Flow controlled by TWS—join us on our voyage toward sustainable water infrastructure.






High-reliability wafer type concentric butterfly valve, ideal for space-saving municipal clean water lines.
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Protects pipelines from vacuum collapse and air pocket resistance, facilitating smooth water transmission.
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Prevents fluid backflow in sewage networks with a resilient seated disc that cushions closing impacts.
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Lug design allows downstream pipeline dismantling under pressure, perfect for urban distribution hubs.
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Filters out rust, debris, and solids to protect downstream municipal pumps and flow control instruments.
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Compact design providing reliable cross-connection control to secure clean municipal drinking water.
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Features a heavy-duty body design providing exceptional resistance to pipeline pressures and stresses.
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Engineered for high-temperature and high-wear municipal applications, ensuring long-term operational life.
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