API609 Ductile Iron High Pressure Operated Full Lug Style Wafer Butterfly Valve

Specification

TIANYU Ductile Iron Full Lug Style Wafer Butterfly Valve: Lightweight Fluid Control Solution for Industrial Applications

I. Product Technical Overview

TIANYU ductile iron full lug style wafer butterfly valve is specially designed for water supply/drainage, building HVAC, and light industry fluid control. Adopting a classic center-line structure (coaxial stem, disc, and pipeline centerline), it covers DN50-DN600 (2″-24″) in diameter, suitable for PN10/PN16 (1.0/1.6MPa) pressure classes, with medium temperature ranging from -10℃ to 120℃ (standard type) and short-term resistance up to 150℃. The body uses ductile iron (tensile strength ≥500MPa, elongation ≥7%), the sealing seat adopts EPDM/NBR rubber, and it is matched with manual, worm gear, or electric drives, widely applied in municipal pipelines, sewage treatment, air conditioning systems, and other non-corrosive media scenarios.

II. Core Product Features

(A) Center-Line Symmetric Structure Design

The core advantage of TIANYU center-line butterfly valve lies in its structural simplicity:

Coaxial Sealing Principle: The stem axis coincides with the disc center and pipeline centerline. The disc rotates 90° around the axis to complete opening/closing. The sealing seat adopts a radial extrusion design, achieving zero leakage through rubber elastic deformation, with a leakage rate ≤1×10⁻⁸m³/s (EN12266 standard).
Low Torque Operation: The opening torque is 25% lower than that of offset butterfly valves, and the manual operation torque of DN200 valve is ≤50N·m, suitable for frequent manual operation scenarios.

(B) Full Lug Wafer Structure

Installation Convenience: The valve body is equipped with full-pass lug shafts on both sides, connected to pipeline flanges through bolts without additional supports, saving 40% installation space compared to flanged valves;
Uniform Force Distribution: The lug structure ensures even distribution of bolt loads, avoiding body deformation, suitable for vibrating conditions (such as pump inlet/outlet pipelines).

(C) High-Performance Material System

Component	Material	Performance Indicators
Body	Ductile Iron	Tensile strength ≥500MPa, temperature adaptation of -10℃-300℃
Disc	Ductile Iron Nickel-plated/304 Stainless Steel	Surface roughness Ra≤6.3μm, erosion resistance improved by 30%
Sealing Seat	EPDM/NBR Rubber	Compression set ≤15% (120℃×72h), resistant to chloride ion corrosion
Stem	2Cr13 Stainless Steel	Trapezoidal thread accuracy 6g, quenched and tempered (HB220-250)

III. Key Technical Attributes

Parameter Category	Technical Indicators	Expansion Options
Size Range	DN50-DN600 (2″-24″)	Customized DN700-DN1200 (subject to engineering evaluation)
Pressure Rating	PN10/PN16 (1.0/1.6MPa)	High-pressure type PN25 (up to 2.5MPa)
Connection Type	Wafer (complying with ISO 5752)	Flanged, welded interfaces (customizable)
Execution Standard	ISO 5281, EN593, GB/T 12238	CE, NSF61 (drinking water certification), WRAS
Drive Type	Manual, Worm Gear, Electric (IP67)	Pneumatic, Hydraulic Actuators (optional)

Product Overview

IV. Manufacturing Processes and Quality Control

(A) Precision Manufacturing Flow

Body Molding:
- Adopts lost foam casting process. GGG50 ductile iron undergoes high-temperature annealing to relieve casting stress, with ferrite content ≥85% in the metallographic structure, ensuring low-temperature toughness (-10℃ impact energy ≥27J).
Disc Processing:
- The disc is processed by CNC lathe, with flatness error ≤0.05mm and nickel plating thickness ≥15μm, passing salt spray test (500 hours without corrosion). Stainless steel discs are solution-treated with grain size ≥Grade 5.
Sealing Assembly:
- The sealing seat is compression-molded, with an interference fit gap with the body ≤0.03mm. Each valve undergoes 1.5x nominal pressure hydrostatic test (30-min hold), 1.1x air pressure test (leakage rate detection), and sampling for 100,000 opening/closing life tests.

(B) Quality Certification System

Material Traceability: Batch numbers of key components can be traced to heat numbers and chemical composition reports, supporting third-party PMI material testing;
System Certification: Certified by ISO 9001 and CE, and products for drinking water comply with NSF61 standards;
Performance Testing: 5,000 opening/closing cycles under 120℃ high temperature, with sealing performance retention rate ≥90%.

Valve Details

Application

V. Product Application Scenarios

(A) Municipal Water Supply/Drainage

In urban water supply networks, TIANYU center-line butterfly valves enable quick opening/closing of large-diameter pipelines, with EPDM sealing seats complying with drinking water standards. In a water transmission project of a provincial capital, DN600 valves have been in continuous operation for 2 years under 1.0MPa pressure without leakage, reducing maintenance costs by 50% compared to traditional gate valves.

(B) Sewage Treatment

Suitable for aeration pipelines (PN10/80℃) in sewage plants, bodies are coated with epoxy resin (thickness ≥200μm) for sewage corrosion resistance. The center-line structure avoids sludge winding around the stem. A case in a sewage treatment plant shows that the valve opens/closes smoothly in sewage with 10% solid content, eliminating the need for regular cleaning.

(C) Building HVAC

In central air conditioning circulating water systems (PN16/95℃), the ductile iron body + NBR sealing seat combination resists ethylene glycol solution corrosion. The full lug wafer design saves space. A commercial complex project using DN300 valves improved installation efficiency by 30% and reduced system energy consumption by 12%.

(D) Light Industry Fluids

In clean water pipelines (PN10/60℃) of food processing plants, EPDM sealing seats are FDA-certified, and the body surface is mirror-polished (Ra≤0.8μm) to meet sanitary requirements. A beverage factory uses DN100 valves in filling lines to achieve precise control of sterile media without cross-contamination risks.