High Quality PN16/PN25 Electric & Manual Butterfly Valve for Waterworks High Temperature Resistance

Product Attribute: Size Range: DN50 ~ DN1200
Pressure Rating: PN10 ~ PN25
Design Standard: EN 593 / ISO 16136
Body Material: Ductile Iron EN-GJS-400-18 / ASTM A536
Disc Material: Stainless Steel CF8/CF8M
Seat Material: EPDM / NBR / PTFE
End Connections: Double Flange
Structure: Centerline Design
Temperature Range: -10℃ ~ 200℃
Seat Leakage: Class A / Class B
Hydro Test: 1.5×PN Shell / 1.1×PN Seat
Operation: Electric Actuator & Manual Override
Flange Standard: EN 1092-2 / ISO 7005
Media: Water / Sewage / Slurry

INFO@TYFLUIDGROUP.COM

Product Overview

TIANYU High-Temperature Butterfly Valve: Efficient Fluid Control Solution for PN16/PN25 Working Conditions

I. Product Technical Overview

TIANYU high-temperature butterfly valve is specially designed for industrial high-temperature fluid control, covering DN50-DN1000 (2″-40″) in nominal diameter, supporting PN16/PN25 pressure ratings, and operating within -20℃-425℃. Suitable for media like water, steam, and oil, the valve adopts a soft-sealing structure where the disc and seat are tightly fitted via EPDM or PTFE elastic materials. Combined with electric/manual dual-drive systems, it enables precise on/off and flow regulation under high-temperature conditions. Widely used in high-temperature pipelines for water plants, heating networks, chemical processes, and power systems to meet shut-off, regulation, and sealing requirements.

II. Core Product Features

(A) High-Temperature Adaptation Design

High-Temperature Resistant Material System: The valve body uses WCB cast steel or 304 stainless steel, annealed at high temperature to maintain ≥70% strength at 425℃. Sealing components adopt silicone rubber or graphite composite materials, resistant to 300℃ (PTFE+carbon fiber up to 260℃), with 50% improved anti-aging performance.
Thermal Compensation Structure: The stem features an extended design to compensate for thermal expansion at high temperatures, avoiding jamming. The gap between the body and disc is controlled at 0.1-0.3mm to prevent leakage due to high-temperature deformation.

(B) Advantages of Soft Sealing Performance

Component	Material	Performance Indicators
Body	WCB cast steel/304 stainless steel	Tensile strength ≥485MPa, adaptable to -20℃-425℃
Disc	Ductile iron/stainless steel	Surface chrome-plated, hardness HV≥500, wear-resistant
Sealing Seat	EPDM+glass fiber/PTFE	Compression set ≤10% (200℃×72h), leakage rate ≤1×10⁻⁹m³/s
Stem	2Cr13 stainless steel	Trapezoidal thread accuracy 6H, quenched & tempered (HB220-250)

(C) Integrated Dual-Drive System

Electric Drive: Standard IP67-protected electric actuator, 220VAC power, built-in PID positioner, supporting 4-20mA signal regulation. DN100 on/off time ≤12s, positioning accuracy ±1%.
Manual Drive: Worm gear reduction mechanism, speed ratio 1:20, operating torque ≤60N·m (DN100), equipped with manual-electric switching for emergency operation during power outages.
Redundancy Design: Electric and manual drives operate independently, complying with API 609 safety standards.

III. Key Technical Attributes

Parameter Category	Technical Indicators	Expansion Options
Size Range	DN50-DN1000 (2″-40″)	Customizable extra-large DN1200 (negotiable)
Pressure Rating	PN16, PN25 (1.6/2.5MPa)	High-pressure PN40 (up to 4.0MPa)
Applicable Temperature	-20℃-425℃ (standard type)	High-temperature -46℃-550℃/low-temperature -196℃ (customizable)
Connection Type	Flange (GB/T 9113/ANSI B16.5)	Wafer-type, welded-type customization
Compliance Standards	GB/T 12238, ISO 5281	API 609, CE, fire certification (API 607)

IV. Manufacturing Processes and Quality Control

(A) Precision Manufacturing Flow

Body Molding:
- Resin sand casting, UT-tested to eliminate shrinkage and porosity. High-temperature annealing relieves internal stress, with wall thickness tolerance controlled at ±0.5mm.
Disc Processing:
- CNC lathe machining ensures roundness error ≤0.03mm, surface roughness Ra≤1.6μm. Chrome plating thickness ≥20μm, passing 1000-hour salt spray test without corrosion.
Sealing Assembly:
- Sealing seats are compression-molded with an interference fit gap ≤0.02mm. Each valve undergoes 1.5x nominal pressure hydrostatic test (30-min hold) and 1.1x air pressure seal test (leakage rate ≤5×10⁻⁹Pa·m³/s).

(B) Full-Process Quality Certification

Material Traceability: Batch numbers of key components traceable to heat numbers and heat treatment records, with PMI material analysis reports provided.
Life Testing: Sampled for 50,000 opening/closing cycles, maintaining ≥95% sealing performance (industry standard: 30,000 cycles).
Third-Party Inspection: Supports SGS, BV certification for pressure resistance, sealing, and high-temperature performance.

Valve Details

V. TIANYU Brand Customization Advantages

TIANYU provides end-to-end customization based on 20 years of industrial valve manufacturing experience and intelligent factories:

In-Depth Technical Customization: Supports non-standard temperature (-196℃-650℃), pressure (PN40), flange standards (DIN/GOST), and explosion-proof actuators (Ex d IIC T6), with 3D modeling and CFD flow analysis.
Rapid Delivery System: 25-day standard lead time, 15-day turnaround for small batches (MOQ 50 units), 72-hour emergency channel for urgent orders.
Global Service Network: 24-month extended warranty, 24/7 response from three major service centers in APAC, Europe, and North America. Critical spare parts delivered via 48-hour airfreight, with digital installation manuals and remote operation maintenance systems.

Application

VI. Product Application Scenarios

Waterworks & Water Supply/Drainage: High-temperature disinfected water pipelines (80℃) in waterworks. EPDM sealing seats resist chloride corrosion, with service life exceeding 8 years.
Heating Networks: Steam pipeline (1.6MPa/180℃) flow regulation in heating stations. Equal percentage flow characteristics ensure uniform heating.
Chemical Industry: Cooling water pipeline (2.5MPa/200℃) control for reaction kettles. Stainless steel body resists medium corrosion, ensuring zero leakage safety.
Power Systems: Circulating water pipeline (PN25/150℃) on/off in power stations. Electric drive responds 20% faster than pneumatic, compatible with DCS systems.