Product Overview

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

I. Product Technical Overview

Newway 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

(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

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.