PRODUCTS

Large-diameter DN300-DN2800 Soft Seal Double Flanged Concentric Butterfly Valve

Port size: DN300-DN2400
Application: Municipal water, industrial circulation, oil & gas, HVAC
Power: Manual worm gear (optional electric/pneumatic)
Customized support: Material/drive customization, certification adaptation (WRAS, DNV-GL)
Temperature of media: -20℃~120℃
Brand name: TIANYU
Standard or Nonstandard: Standard (EN1092, ISO 9001, CE)
Body: Ductile iron (QT450)/stainless steel (CF8)
Seal: EPDM/NBR soft seal
End connection: Double flange (EN1092)
Design: Concentric, U-section flange
Testing: API 598 hydrostatic, EN12266 leakage test

Share this page:

Related Products

API 609 ASME B16.34 CE Certified DN80 PN16 WCB Carbon Steel Body SS304 Disc EPDM Soft Seal Flange Center-Line Butterfly Valve

TIANYU’s DN80 PN16 center-line butterfly valve delivers cost-effective, reliable flow control for water, HVAC, and light industrial applications. Its WCB body, SS304 disc, and EPDM soft seal balance strength, corrosion resistance, and tight sealing (Class IV). Customize it to your needs: opt for Viton seats (150℃ service), a lockable lever (security), or SS316 disc (enhanced corrosion). For larger systems, upgrade to a worm gear operator (reduced torque). Tailored to your media and operational requirements, it combines simplicity, durability, and compliance—your go-to butterfly valve solution.

API 609 ASME CE DN200 PN10 GGG40 Ductile Iron 2507 Duplex Steel PTFE Full-Lined Wafer Type Concentric Line Soft Seal Butterfly Valve

TIANYU’s PTFE-lined concentric line butterfly valve delivers cost-effective, leak-tight control for corrosive media. Customize it to your operational needs: opt for PFA lining (up to 200℃) for heated fluids, 2205 duplex steel for extreme saline service, or PN25 pressure rating for higher-pressure systems. Add pneumatic/electric actuators for automated control, or FDA-compliant lining for food/pharmaceutical use. These tweaks enhance compatibility with your specific media, pressure, and workflow—boosting reliability, reducing long-term costs, and ensuring seamless integration into your process.

API 609 ASME CE DN150 PN10 GGG40 Ductile Iron 2507 Duplex Steel PTFE Full-Lined Wafer Type Midline Soft Seal Butterfly Valve

TIANYU’s PTFE-lined midline butterfly valve delivers cost-effective, leak-tight control for corrosive media. Customize it to your needs: opt for PFA lining (higher temperature tolerance, up to 200℃) for heated fluids, 2205 duplex steel for extreme saline service, or PN25 pressure rating for higher-pressure systems. Add pneumatic/electric actuators for automated control, or FDA-compliant lining for food/pharmaceutical use. These tweaks enhance compatibility with your specific media, pressure, and operational requirements—boosting reliability and reducing long-term costs.

DN175 PN10 Aluminum Bronze Disc with Rubber Lining, Soft-Seal DI Lug-Type Flanged Midline Butterfly Valve

TIANYU DI lug-type midline butterfly valve delivers cost-effective, leak-tight flow control for water, sewage, and industrial fluid systems. Its aluminum bronze disc, rubber soft seal, and DI body ensure corrosion resistance, durability, and Class VI sealing.Customize with 316 stainless steel disc for extreme corrosion, Viton lining for high-temperature oil resistance, or electric/pneumatic actuation for automation. Opt for larger sizes (DN50-DN300), higher pressure ratings (PN16), or WRAS/NSF 61 certification for potable water. Tailor to your media, temperature, and installation needs for optimal performance.

Description

Specification

TIANYU Large-Diameter Concentric Soft-Seal Flanged Butterfly Valve:with Replaceable Seat, Low Torque, Bare Shaft, zero Leakage

I. Product Technical Positioning

The TIANYU large-diameter concentric soft-seal flanged butterfly valve is specially designed for fluid control in large pipe diameters ranging from DN300 to DN2400 (12″ to 96″). Adopting a concentric structure (with the stem, disc, and pipeline centerline coaxial), it uses ductile iron (DI) or stainless steel (CF8/CF8M) as the main material, suitable for PN10-PN16 (1.0-1.6MPa) pressure classes. The valve connects to pipelines via double flanges (complying with EN1092 standards) and can be equipped with worm gear, electric, or pneumatic drives. It is ideal for high-flow applications in water treatment, municipal pipe networks, oil & gas transportation, and building HVAC systems, especially for clean media like water, air, and oil at normal to medium temperatures (-20°C to 120°C).

II. Core Product Features

(A) Concentric Structure & Soft Seal Design

Concentric Layout:
The stem axis aligns with the disc center and pipeline centerline. The disc rotates around the axis, completing opening/closing within a 90° stroke, featuring a simple structure and low flow resistance (flow coefficient Cv ≥10,000, pressure loss ≤0.5m water column for DN1000).
Replaceable Soft Seal Seat:
The seat uses EPDM/NBR rubber (compression set ≤8% at 120°C×72h), fixed by dovetail grooves or pressure rings for online replacement when worn, reducing maintenance costs by 40% compared to hard-seal valves. The rubber-clad disc edge ensures zero-leakage sealing (leakage rate ≤5×10⁻⁸m³/s, conforming to EN12266).

(B) U-Section Flange & Low-Torque Operation

U-Section Flange Structure:
The valve body flange adopts a U-shaped cross-section design to enhance structural rigidity for large diameters (flange thickness ≥34mm for DN1000), reducing deformation during bolt tightening. It complies with EN558-1 Series 20 face-to-face dimensions for strong installation compatibility.
Low-Torque Operation:
The worm gear reducer (ratio 1:30-1:60) uses a bronze worm wheel + 45# steel worm shaft, surface carburized (hardness HRC55-60). Manual operation torque for DN1000 ≤150N·m, electric actuator full-stroke time ≤20s, adapting to rapid response needs of automation systems.

(C) Material System & Application Adaptability

Component	Material	Performance Indicators
Body	Ductile Iron QT450-10	Tensile strength ≥450MPa, impact energy ≥27J at -20°C
Disc	Ductile Iron/304 SS	Surface roughness Ra≤3.2μm, erosion resistance +30%
Seat	EPDM/NBR Rubber	Temperature -20°C~120°C, chloride ion corrosion resistant
Stem	2Cr13 Stainless Steel	Trapezoidal thread accuracy 6g, quenched & tempered HB220-250

III. Key Technical Parameters

Parameter Category	Technical Indicators	Expansion Options
Nominal Size	DN300-DN2400 (12″-96″)	Custom DN2600-DN3000 (engineering evaluation)
Pressure Rating	PN10-PN16 (1.0-1.6MPa)	High-pressure PN25 (2.5MPa)
Connection Type	Double Flange (EN1092)	Butt weld, socket weld (ASME B16.25)
Actuation	Manual Worm Gear/Electric/Pneumatic	Hydraulic actuator, explosion-proof (Ex d IIC T6)
Sealing Standard	EN12266 Class A/B	Fire certification API 607 (metallic seal redundancy)
Testing Standard	API 598, EN12266	Low-temperature testing (-40°C, requires material upgrade)

Product Overview

IV. Manufacturing Processes & Quality Control

(A) Precision Manufacturing Flow

Body Casting & Machining:
- Ductile iron bodies use lost foam casting, annealed at high temperature to relieve stress, with graphite spheroidization rate ≥90%. 100% ultrasonic testing (UT) after machining, surface roughness Ra≤12.5μm.
- Flange surfaces are machined by CNC gantry milling, flatness error ≤0.05mm, bolt hole spacing deviation ≤±0.3mm to ensure installation tightness.
Disc & Seat Assembly:
- The disc undergoes dynamic balance testing (residual unbalance ≤5g·cm). Rubber seats are molded under pressure, with interference fit clearance ≤0.02mm to the body. Each valve undergoes 1.5x nominal pressure hydrostatic test (30-min hold) and 1.1x air pressure test (helium leak detection).
Drive System Debugging:
- Worm gear meshing clearance controlled at 0.05-0.1mm. Electric actuators undergo 100 no-load cycle tests, positioning accuracy ±1%, torque overload protection set at 1.2x rated value.

(B) Quality Certification System

Material Traceability: Key components come with heat numbers and CMA-certified chemical reports, supporting third-party PMI testing.
System Certifications: Holds ISO 9001, CE-PED; drinking water products comply with WRAS; marine models can provide DNV-GL, LR classification certifications.
After-Sales Guarantee: 18-month warranty, free replacement for leakage due to process issues, lifelong maintenance technical support.

Valve Details

VI. TIANYU Brand Customization Advantages

Based in Wenzhou’s smart manufacturing base, TIANYU offers end-to-end customization for large-diameter concentric butterfly valves:

Deep Material Customization: Supports special materials like duplex steel (2205), Hastelloy C276 for harsh media, providing corrosion simulation test reports.
Drive System Expansion: Can integrate intelligent electric actuators (with Modbus), pneumatic diaphragm actuators (with positioners), or manual emergency devices for explosion-proof, fire-proof scenarios.
Certification & Standard Adaptation: Provides API, JIS, GOST custom designs, WRAS/NSF61 drinking water certifications, and classification society approvals (LR, ABS).
Rapid Delivery System: 25-day standard lead time, 15-day small-batch customization (≥1 unit), 72-hour emergency channel with real-time production tracking.
Global Service Network: Technical service centers in APAC, Europe, North America offer on-site installation guidance, maintenance training, 24/7 emergency response, with critical spares delivered via airfreight within 48 hours.

Application

. Product Application Scenarios

(A) Municipal Water Supply/Drainage

In urban main water transmission pipes (DN1000-DN1400), TIANYU valves’ EPDM seats meet drinking water safety standards. The U-flange design adapts to frequent disassembly needs of municipal pipes. In a provincial capital’s South-to-North Water Diversion project, DN1200 valves operated leak-free for 3 years at 1.0MPa, reducing maintenance costs by 60% compared to gate valves.

(B) Industrial Circulating Water Systems

In thermal power plant circulating water pipes (DN800-DN2000), ductile iron bodies with epoxy coating (thickness ≥200μm) resist cooling water corrosion. Electric actuators integrate with DCS systems for automatic cooling tower water flow regulation. In a 300MW unit, valves responded within ≤15s to match unit load changes.

(C) Oil & Gas Storage/Transportation

In refinery gas pipelines (DN600-DN1200, PN16), NBR seats resist hydrocarbon media, and worm gear drives allow manual operation in explosion-proof areas. A petrochemical enterprise uses DN1000 valves for gas emission control, achieving zero-leakage shut-off via API 598 testing.

(D) Building HVAC Systems

In commercial complex air conditioning chilled water pipes (DN300-DN800), low torque reduces electric actuator power demand by 25%, integrating with BA systems for variable flow control. A skyscraper project using DN600 valves reduced system energy consumption by 12%, with U-flanges saving 30% installation space.

Our Strengths

Best Quality Industrial Valve Solutions For You

QUALITY WARRANTY

A warranty of 18 months after delivery or 12 months after installation is provided by TianYu for all supplied valves.

FAST LEAD TIME

General lead time is around 8 weeks(conventional valves) with high efficient production process and regular expedition procedure.

COST-EFFECTIVE PRICE

With A quality but cost-effective supply chain, we offer client with reasonable price and low aftersales cost, to build a healthy and long term partnership.

VALUE ADDED SERVICE

From early bidding to final shipment we have a professional team standby to support client on commercial, technical, quality and transportation issues.

Industrial Applications

Petrochemical Industry

In the petrochemical industry, valves are used to control fluid flow, pressure, and prevent accidents. They are capable of enduring high temperatures and pressures in refinery environments, ensuring safe and smooth operation of processes.

Power Industry

In the power industry, valves are used to control the flow of steam, water, and oil. Globe valves and gate valves in steam pipelines ensure smooth steam transportation, while butterfly valves are commonly used to regulate flow.

Food & Beverage Industry

In the food and beverage industry, valves are used for fluid transportation and control. These valves need to meet sanitary standards to ensure the safety and quality of food products.

Environmental Protection Sector

In the environmental protection sector, valves are used in wastewater treatment systems to control the discharge of sewage, ensuring the effectiveness of wastewater treatment. They play an important role in environmental protection and sustainable development.

Factory Capacity

China Professional Valve Manufacturer & Supplier

Years

Production Equipments

Manufactuing Area

0 m²

Annual Production Value

$ 0