Specification

TIANYU Fluorine Lined Wafer Type Pneumatic Butterfly Valve: A Professional Solution for Strong Corrosion Media Control

I. Product Technical Positioning and Core Parameters

The TIANYU fluorine lined wafer type pneumatic butterfly valve is specially designed for strong corrosion working conditions, covering standard diameters from DN50 to DN200 (2″ to 8″) and suitable for pressure classes PN10/PN16 (1.0/1.6MPa). The valve adopts wafer type connection, with the internal body fully lined with fluoroplastic (PTFE/FEP/ETFE), and is combined with a pneumatic actuator for precise control. Driven by double-acting or single-acting pneumatic (explosion-proof type optional), it is suitable for strong corrosive media such as sulfuric acid, hydrochloric acid, and strong alkali, with a temperature range of -20°C to 180°C, widely used in the cutting and regulation of corrosive fluids in chemical, pharmaceutical, environmental protection, and other industries.

II. Analysis of Core Technical Features

(A) Fluorine Lining Anti-Corrosion System

Full Fluorine Lining Structure Design:
The valve body, disc, and internal flow channel adopt integrally molded fluoroplastic lining (thickness ≥2mm), commonly made of PTFE (polytetrafluoroethylene) or FEP (fluorinated ethylene propylene), which can resist strong corrosive media such as 98% sulfuric acid and 30% sodium hydroxide, with a permeability ≤0.01mg/cm²·day, in compliance with ASTM D1433 standards.
Anti-Desquamation Process:
The lining and valve body are combined through dovetail grooves + mechanical anchoring, cured at 200°C to ensure the bonding strength between the lining and metal matrix ≥5MPa, avoiding the risk of desquamation caused by media scouring (such as intergranular corrosion scenarios common in sulfuric acid pipelines).

(B) Advantages of Wafer Type Structure

Space-Saving Design:
The thickness of the wafer type valve body is only 1/3 of that of the flanged type, suitable for compact installation scenarios (such as pipeline interlayers and reactor inlets/outlets), with a 40% weight reduction and 25% lower installation costs.
Bi-Directional Sealing Performance:
The fluoroplastic cladding layer on the disc edge forms an elastic sealing pair with the valve seat, achieving bi-directional zero leakage through air pressure assistance (leakage rate ≤1×10⁻⁸m³/s, EN12266 Class A standard), especially suitable for corrosive media pipelines requiring bi-directional cutoff.

(C) Pneumatic Drive System

Efficient Actuator:
The aluminum alloy pneumatic actuator undergoes anodizing treatment, with a built-in double-piston rack and pinion mechanism, response time ≤0.8 seconds (DN50), output torque ≥50N·m, supporting 4-20mA signal feedback and stroke adjustment.
Safety Redundancy Design:
Optional spring return device (single-acting type) automatically resets to a safe position in case of air failure; explosion-proof actuators comply with Ex d IIC T6 standards, suitable for inflammable and explosive environments (such as chemical workshops).

III. Important Technical Attributes

Parameter Category	Technical Indicators	Expansion Options
Nominal Diameter	DN50-DN200	Custom DN250-DN300 (requires engineering evaluation)
Lining Material	PTFE/FEP/ETFE	PFA (perfluoroalkoxy) upgrade (temperature resistance 260℃)
Pressure Class	PN10/PN16	High pressure PN25 (2.5MPa)
Actuation Mode	Double-acting/single-acting pneumatic	Electric (explosion-proof), hydraulic
Testing Standard	API 598, EN12266	Fire test API 607 (metal backing redundancy design)
Applicable Media	Strong acid, strong alkali, organic solvents	High-temperature molten salt (requires material upgrade)

Product Overview

IV. Manufacturing Processes and Quality Control

(A) Precision Processing Flow

Valve Body Pretreatment:
The carbon steel valve body undergoes sandblasting rust removal (Sa2.5 grade), and the inner lining surface is grooved with dovetail grooves (depth 1.5mm), ensuring no pinhole defects through spark detection (voltage 15kV).
Fluorine Lining Molding:
Adopting molding and sintering process, PTFE powder is sintered at 380℃, and the cooling rate is controlled within 5℃/min to avoid internal stress cracking; after lining, full-size machining is performed to ensure the flatness of the sealing surface ≤0.05mm.
Assembly and Testing:
Each valve undergoes 1.5 times nominal pressure hydrostatic testing (holding pressure for 30 minutes) and helium leak detection (leakage rate ≤1×10⁻⁹mbar·L/s). Sampling is conducted for 100,000 opening-closing cycle tests, with lining wear ≤0.1mm.

(B) Quality Certification System

Material Compliance: Fluorine linings pass FDA certification (suitable for food contact) and NSF61 certification (drinking water), and chemical-grade products provide TÜV Rheinland chemical compatibility reports;
System Certification: Holds ISO 9001 and CE-PED certifications, explosion-proof actuators comply with ATEX directives, and marine models can provide LR/DNV-GL certifications.

Valve Details

VI. TIANYU Brand Customization Advantages

TIANYU provides end-to-end customization services relying on the Wenzhou fluoroplastic valve manufacturing base:

In-Depth Material Customization: Select different fluoroplastics such as PTFE, FEP, and PFA according to media characteristics, and support dynamic corrosion simulation tests (such as sulfuric acid concentration/temperature gradient tests) to provide material selection reports;
Drive System Expansion: Can integrate intelligent positioners (with HART protocol), explosion-proof electric-pneumatic converters, or install handwheel mechanisms to achieve dual pneumatic/manual operation, adapting to unmanned stations;
Rapid Certification Response: Complete CE, ATEX, and other certification filings within 7 working days, provide ASME NPT certification for special industries (such as nuclear power), and support customized inspection reports;
Delivery and Service Assurance: Standard products (DN50-DN100) are in stock within 72 hours, customized orders are delivered within 15 days, global service centers provide lining repair services (such as on-site hot-melt repair for local wear), and critical spare parts are air-delivered within 48 hours.

Application

V. Product Application Scenarios

(A) Chemical Production

In the inlet/outlet pipelines of 98% sulfuric acid storage tanks, TIANYU fluorine lined butterfly valves resist strong oxidative corrosion through PTFE lining, and pneumatic actuators are linked with DCS systems to achieve automatic liquid supplementation control. A chemical enterprise uses DN100 valves, which have operated leak-free for 3 years, reducing maintenance costs by 60% compared to ordinary valves.

(B) Wastewater Treatment

In the cyanide-containing wastewater pipeline (pH 1-14) of electroplating workshops, FEP lined butterfly valves resist alternating acid-base corrosion, and with the pneumatic quick-closing function, they cut off media within 1 second in case of sudden leakage. In an application case of an automobile electroplating line, the valve passes the SIL2 functional safety certification, ensuring the reliable operation of the environmental protection system.

(C) Pharmaceutical Engineering

ETFE lined butterfly valves are used in the hydrochloric acid regulating pipeline (temperature 80℃) of penicillin fermentation tanks, in compliance with GMP standards, and the lining surface roughness Ra≤0.8μm to avoid media residue. Cleaning validation shows that the bacterial retention rate on the valve inner surface ≤0.1cfu/cm², meeting the requirements of sterile production.

(D) Petroleum Refining

In the acid-base refining unit of lubricating oil, DN150 fluorine lined butterfly valves resist alternating acid-base scouring, and the actuators adopt explosion-proof design (Ex d IIC T4), achieving precise flow regulation in the catalytic reforming unit with pressure drop ≤0.2bar, ensuring process stability.