Specification

TIANYU Concentric Soft-Seal Butterfly Valve: A Multi-Scenario Solution for Industrial Fluid Control

I. Product Technical Positioning

The TIANYU Concentric soft-seal butterfly valve covers a nominal diameter range of DN40 to DN1200 (1.5″ to 48″), adopting a concentric central line structure (with the stem, disc, and pipeline centerline coaxial). The main materials include 304 stainless steel (CF8), ductile iron (DI), or WCB cast steel, suitable for medium-pressure conditions of PN10/PN16 (1.0/1.6MPa). The valve supports three connection types: wafer, lug, and flange, and can be equipped with manual handles, worm gears, or electric/pneumatic actuators. It is suitable for on-off and regulation control of media such as water, air, and oil within the temperature range of -20°C to 120°C, widely used in municipal engineering, industrial circulation systems, and building HVAC fields.

II. Core Product Features

(A) Concentric Central Line Structure Design

Low-Resistance Flow Channel Characteristics:
The central line layout makes the disc parallel to the fluid flow direction in the open state, with the flow resistance coefficient Cv increased by 20% compared to the eccentric structure (pressure loss of DN300 valve ≤0.3m water column), especially suitable for large-flow transportation scenarios (such as urban main water transmission pipes).
90° Precise On-Off:
The handle operation stroke is fixed at 90°, and the limit device is used to achieve precise feedback of the on-off state. The manual operation torque is ≤80N·m (DN200), which can be easily controlled by human force.

(B) Advantages of Soft Seal System

Multi-Material Sealing Solutions:
The valve seat can be selected from EPDM, NBR, or PTFE rubber, among which EPDM is suitable for drinking water (WRAS certified), NBR is resistant to oil media (resistant to ASTM No. 3 oil test), and PTFE is suitable for strong corrosion environments (pH 1-14), achieving zero-leakage sealing (leakage rate ≤5×10⁻⁸m³/s, EN12266 Class A standard).
Replaceable Design:
The seal seat is fixed by a dovetail groove or pressure ring, and can be replaced online without disassembling the pipeline after wear, reducing maintenance costs by 35% compared to hard-seal valves.

(C) Multi-Scenario Connection Adaptation

Wafer Type:
Compact structure, suitable for scenarios with limited space (such as building pipe galleries), installed by clamping through pipeline flanges, 15% lighter than the flange type.
Lug Type (LT):
The valve body has its own mounting holes, fixed by bolt penetration to prevent axial displacement, suitable for vibration conditions (such as pump inlets and outlets).
Flange Type:
In line with ANSI B16.5/DN standards, the sealing surface can be selected from RF surface or RTJ groove surface, suitable for high-pressure pipeline systems.

III. Important Technical Attributes

Parameter Category	Technical Indicators	Expansion Options
Nominal Size	DN40-DN1200	Customized DN1400-DN2000 (requires engineering evaluation)
Pressure Rating	PN10/PN16 (1.0/1.6MPa)	Upgraded to PN25 (2.5MPa)
Material System	304 stainless steel/ductile iron/WCB	316L stainless steel, duplex steel 2205 (corrosion-resistant scenarios)
Actuation Mode	Manual/worm gear/electric/pneumatic	Hydraulic actuator, explosion-proof type (Ex d IIC T6)
Sealing Standard	EN12266 Class A	Fire protection certification API 607 (metal seal redundancy design)
Testing Standard	API 598 (1.5 times hydrostatic test)	Low-temperature test (-40℃, material upgraded to 304L)

Product Overview

IV. Manufacturing Processes and Quality Control

(A) Precision Processing Flow

Stainless Steel Valve Body Treatment:
- 304 stainless steel adopts investment casting, and the casting undergoes solution treatment (1050℃×1h) to eliminate intergranular corrosion tendency, with a surface roughness of Ra≤6.3μm; the flange surface is processed by CNC boring and milling, with a flatness error of ≤0.03mm.
Disc and Stem Assembly:
- The disc undergoes dynamic balance testing (residual unbalance ≤10g·cm), and the stem and disc are connected by involute splines (fit tolerance H7/g6) to prevent axial movement; the stainless steel stem surface is nitrided (hardness HV≥700), and the wear life is increased by 3 times.
Seal Testing Process:
- Each valve undergoes a 1.5-fold nominal pressure hydrostatic test (holding pressure for 30 minutes) and a 1.1-fold air pressure leakage test (helium leak detection). Sampling is conducted for 100,000 opening and closing life tests, and the sealing performance retention rate is ≥95%.

(B) Quality Certification System

Material Traceability: The stainless steel valve body is accompanied by a heat number and an intergranular corrosion (ASTM A262 E method) test report, supporting third-party PMI material testing;
System Certification: Holds ISO 9001, CE-PED certifications, drinking water valves comply with WRAS standards, and marine models can provide LR/DNV-GL certifications;
After-Sales Guarantee: Commit to a 12-month warranty period, and provide free replacement services for leakage caused by seal failure.

Valve Details

VI. TIANYU Brand Customization Advantages

Relying on the Wenzhou manufacturing base, TIANYU provides end-to-end customization services for Concentric butterfly valves:

Deep Material Customization: Provide special materials such as 316L (seawater resistance) and Hastelloy C276 (concentrated acid resistance) according to medium characteristics, and support corrosion simulation test reports;
Drive System Expansion: Can integrate intelligent electric actuators (with 4-20mA feedback), pneumatic diaphragm actuators (with positioners), or install manual emergency devices to adapt to the needs of automated production lines;
Rapid Certification Response: Provide CE, UL certifications for the European and North American markets, complete WRAS filing within 7 working days for drinking water projects, and support on-site inspection by LR/ABS for marine orders;
Delivery Efficiency Guarantee: Standard orders are delivered in 10 days, small-batch customization (≥1 unit) is shortened to 7 days, a 48-hour emergency channel is activated for urgent orders, and production progress is tracked online in real time;
Global Service Network: Technical centers are set up in East China, South China, and Europe to provide on-site installation training, regular maintenance inspections, and 24-hour fault response. Critical spare parts are delivered within 48 hours through DHL/FEDEX.

Application

V. Product Application Scenarios

(A) Municipal Water Supply and Drainage Engineering

In the urban secondary water supply system (DN100-DN600), the 304 stainless steel valve body is matched with an EPDM seal seat, which meets the drinking water hygiene standards. In a water transmission project of a prefecture-level city, the DN300 valve has been in leak-free operation for 2 years, and the maintenance cycle has been extended to 18 months. The ductile iron valve body of the rainwater pipe network is coated with epoxy resin (thickness ≥200μm) to resist sewage corrosion, and the DN800 valve realizes rapid opening and closing control during the flood season.

(B) Industrial Circulation System

In the thermal power plant circulating water pipeline (DN400-DN1000), the WCB cast steel valve body is matched with an NBR seal seat to withstand long-term scouring of 80℃ cooling water. The electric actuator (IP67 protection) is linked with the DCS system to realize automatic adjustment of the cooling tower flow. In a 300MW unit application, the valve response time is ≤10 seconds.

(C) Building HVAC

In the commercial complex air conditioning chilled water system (DN50-DN300), the wafer-type butterfly valve saves 30% of the installation space, and the manual handle is suitable for operation in the ceiling. The NBR seal seat has a compression set of ≤5% under the 70℃ working condition. A super high-rise office building uses DN200 valves, and the system energy consumption is reduced by 15% compared with traditional gate valves.

(D) Oil and Gas Storage and Transportation

In the refinery gas pipeline (DN150-DN500, PN16), the 304 stainless steel valve body is resistant to oil and gas corrosion, and the worm gear drive can be manually operated in the explosion-proof area. A petrochemical enterprise uses DN300 valves to control gas emissions, and the zero-leakage performance is verified through the API 598 test.