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.

CE Certification Duplex Type Pinless Butterfly Valve Factories, Factory

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CE Certification Duplex Type Pinless Butterfly Valve Factories, Factory

Dual-phase steel, also known as complex phase steel, is a steel in which the ferrite phase and austenite phase each account for about half of the solid solution structure. Generally, the content of the minor phase also needs to reach 30%. In the case of low carbon content, the Cr content is 18%~28%, and the Ni content is 3%~10%. Some steels also contain alloying elements such as Mo, Cu, Nb, Ti, and N. Dual-phase steel is widely used in desulfurization systems and seawater desalination systems.

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Product Description

Application & Performance Features

Good corrosion fatigue resistance and wear corrosion resistance.

Good pitting resistance in harsh operational environments.

Good resistance to chloride stress corrosion cracking.

Good comprehensive mechanical properties: high strength and fatigue strength with yield strength twice that of 18-8 austenitic stainless steel. Elongation in solid solution state reaches 25%, and toughness AK exceeds 100J.

Common Material Grades

DIN 1.4469 (A890) 2507 (UNS S32750 / DIN 1.4410) 2205 (UNS S31803 / DIN 1.4462) 2304 (UNS S32304) UNS S32900 (DIN 1.4460) UNS S31260

Product Performance Specification

Nominal Diameter	Nominal Pressure	Travel Angle	Operating Temp.	Coating Thickness	Applicable Media	Connection Type	Connection Standard
DN40-DN2000 (1.5” – 80”)	PN1.0 – 1.6 MPa	0° – 90°	-20°C – 120°C	Min. 200 μm	Seawater, fresh water, air, desulfurization liquid, urea & phosphate fertilizer, high chloride solutions, 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

What are the mechanical advantages of these duplex valve materials?

The material exhibits high overall strength and fatigue resistance, boasting a yield strength double that of standard 18-8 austenitic stainless steel. In solid solution state, it delivers an elongation of 25% and an impact toughness (AK) exceeding 100J.

Which media and operating conditions are suitable for this product?

These valves are designed for seawater, fresh water, air, desulfurization liquids, urea, phosphate fertilizers, and solutions containing high chloride ions. They operate reliably within a temperature range of -20°C to 120°C under nominal pressures of PN1.0 to 1.6 MPa.

What size ranges and connection types are available?

Sizes range from DN40 to DN2000 (1.5” to 80”). Available connection styles include Wafer type (flangeless A-type, U-type, single flange), Single clamp type (LT body), and double flange designs.

Which international connection standards do the valves comply with?

The connection design complies with all major global engineering standards, including GB, DIN, BS, JIS, ASME, EN, ANSI, and ISO.

What surface coating thickness is applied for corrosion prevention?

A protective coating with a minimum thickness of 200 μm is applied to ensure enhanced surface durability and extended service life in corrosive environments.

What common material grades are supported for fabrication?

Available grades include DIN 1.4469 (A890), 2507 (UNS S32750, DIN 1.4410), 2205 (UNS S31803, DIN 1.4462), 2304 (UNS S32304), UNS S32900 (DIN 1.4460), and UNS S31260.