What types of industrial valves does Tianjin Top Valve manufacture?

We manufacture resilient-seated butterfly valves (wafer, lug, double-flanged and grooved-end), check valves (dual plate, wafer lift, silent and ball type), resilient seat gate valves (rising stem, non-rising stem, buried and DIN pattern), globe valves for water, ammonia, vacuum and power-station service, as well as ball valves and eccentric plug valves.

Are your butterfly valves approved for drinking water?

Selected models, including 4020G, 4020L, 4325G and 4325L, are WRAS approved for potable water applications. Request our catalog to receive the approval reference and material declaration for each model.

Do you produce your own rubber seats and castings?

Yes. Our group operates Tianjin Dongfang Rubber Factory (since 1987) and Tianjin Donglian Valve Factory (since 1996), with an independent foundry, rubber compounding and moulding, a CNC machining center, assembly lines and a physical and chemical laboratory. This lets us control elastomer quality and casting integrity in-house.

Which quality and management certifications do you hold?

Our management system meets ISO 9001 quality management, ISO 14001 environmental management and ISO 45001 occupational health and safety standards, together with EU (CE) conformity for applicable products.

Can you supply valves to international flange and dimension standards?

Depending on the model, valves can be supplied with flange drilling to EN 1092 PN10/PN16, ASME/ANSI Class 125/150, BS and JIS, and our German-standard gate valves follow DIN face-to-face dimensions. Always confirm the exact standard on the model datasheet before ordering.

How can I get datasheets, drawings and a product catalog?

Request a catalog online or email victor@dytopvalve.com with your size, pressure rating, media and connection type. Our engineering team replies within 24 hours with datasheets, dimensional drawings and material specifications.

Where is your factory located and how are orders shipped?

Our factory is in the Wuxia Industrial Park, Dongli District, Tianjin, China, with fast road access to Tianjin Port. We export to customers in more than 50 countries using protective packaging and sea, air or rail freight.

High-Quality Rubber Lined Pinless Butterfly Valve Supplier, Factories

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High-Quality Rubber Lined Pinless Butterfly Valve Supplier, Factories

Nylon PA-11, synthesized through the polycondensation of ω-amino undecanoic acid, demonstrates exceptional chemical resistance against common acids, alkalis, and oxidizing agents. Its low moisture absorption rate (<1.5% at saturation) ensures superior dimensional stability compared to other polyamides, while maintaining excellent wear resistance and oil-repellent properties. These characteristics make PA-11-coated butterfly valves particularly suitable for demanding fluid control applications across multiple industries. In environmental protection systems, they effectively manage water treatment processes, while their chemical inertness benefits power generation cooling circuits and metallurgical slurry transport. The valves' corrosion-resistant construction proves equally valuable in paper manufacturing effluents and petrochemical pipelines, offering reliable performance in both potable water distribution and industrial wastewater drainage systems under continuous operation conditions.

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Product Description

Application & Advantages

Wear Resistance Nylon's wear resistance is 7 times that of copper, prolonging valve life by 3 times.

Low Operating Torque Self-lubricating, smooth, and wear-reducing characteristics significantly lower operating torque.

Chemical Properties Resistant to alkali, salt, and weak acids; inert to organic compounds across diverse media.

Energy Efficient Flow Smooth nylon coating reduces fluid friction resistance, enhancing energy savings.

Eco-Friendly & Safe Non-toxic, antibacterial, anti-mildew, environmentally compliant material.

Pinless Connection Isolates medium from metal, boosting reliability and simplifying valve maintenance.

External Protection Fully sprayed plastic surface offers clean aesthetics and high external anti-corrosion.

High Cost-Efficiency Nylon valve plates deliver solid economic performance, costing less than stainless steel.

Product Performance Specification

Nominal Diameter	Nominal Pressure	Travel Angle	Operating Temperature	Coating Thickness	Applicable Media	Connection Type	Connection Standard
DN40 - DN2000 (1.5” - 80”)	PN1.0 - 1.6MPa	0° - 90°	-20 - 60℃	Mini 200um	Seawater, fresh water, air, natural gas, alkali, salt, weak acid, organic compounds, etc.	Wafer type (flangeless A type, U type, single flange type), Single clamp type (LT body), double flange	GB / DIN / BS / JIS / ASME / EN / ANSI / ISO

Packaging & Delivery

Frequently Asked Questions

Q1 What makes the nylon-coated sealing surface superior to traditional materials?

Nylon provides a wear resistance 7 times higher than copper, effectively extending the overall valve operating lifespan by 3 times. Its self-lubricating surface lowers torque demands and reduces fluid friction during operation.

Q2 What media types can this butterfly valve handle?

It is suitable for a diverse range of media including seawater, fresh water, air, natural gas, alkalis, salts, weak acids, and various organic chemical compounds.

Q3 What are the operating limits for temperature and nominal pressure?

The valve is engineered for operating temperatures between -20°C and 60°C, and nominal working pressure ratings between PN1.0 and 1.6 MPa.

Q4 What size range and connection types are supported?

The nominal diameter spans from DN40 up to DN2000 (1.5" to 80"). Available configurations include wafer type (flangeless A type, U type, single flange), single clamp type (LT body), and double flange designs adhering to GB, DIN, BS, JIS, ASME, EN, ANSI, and ISO standards.

Q5 How does the pinless connection design optimize maintenance?

The advanced pinless design completely separates the internal medium from the structural metal components. This isolation minimizes degradation, significantly enhances operational reliability, and reduces labor and downtime during routine maintenance.

Q6 Is the valve safe and compliant for environmentally sensitive applications?

Yes, the nylon coating is entirely non-toxic, antibacterial, and anti-mildew. Along with low fluid resistance for energy efficiency, it delivers thorough external anti-corrosion protection via full plastic spray treatment.