Specification

DN50 Ductile Iron Metal-Seated Flanged Connection Telescopic Soft Seal Mechanical Gate Valve

I. Product Overview

Newway DN50 ductile iron metal-seated flanged connection telescopic soft seal mechanical gate valve is a precision-engineered industrial valve designed for reliable flow control in medium-pressure systems. Combining the toughness of ductile iron with the versatility of a telescopic structure and dual sealing (soft + metal), this valve balances tight shutoff, pipeline flexibility, and durability—critical for handling water, steam, and mild industrial fluids. Its flanged connection ensures secure integration into pipelines, while the telescopic design compensates for thermal expansion or minor pipeline misalignment, reducing stress on joints. Whether deployed in municipal water networks, HVAC systems, or light industrial processes, this valve delivers consistent performance, adapting to fluctuating pressure and temperature conditions with minimal maintenance.

II. Key Attributes and Specification Parameters

Basic Attributes

Structure Design: Telescopic gate valve with a split-body structure, featuring a movable inner cylinder that slides within the outer body to absorb pipeline displacement (axial or angular). This design eliminates stress from thermal expansion, contraction, or ground settlement, preventing valve or pipeline damage—a key advantage over rigid gate valves.

Body Material: Ductile iron (grade QT450-10), a malleable alloy with superior mechanical properties: tensile strength ≥450MPa, elongation ≥10%, and impact resistance (≥15J at -20℃). QT450 offers better corrosion resistance than gray iron, making it suitable for wet or humid environments, while balancing cost and durability.

Sealing System: Dual-mode sealing combining soft and metal components:

Primary seal: PTFE (polytetrafluoroethylene) soft seal ring bonded to the gate, ensuring bubble-tight shutoff for clean media (water, steam) with low friction and chemical resistance.

Secondary seal: Metal-to-metal backup seal (ductile iron or alloy steel) on gate and seat surfaces, activating under high pressure or abrasive conditions to prevent leakage if the soft seal wears—enhancing reliability in harsh scenarios.

Pressure Rating: PN10 to PN25 (1.0MPa to 2.5MPa), suitable for medium-pressure systems such as municipal water mains, industrial steam lines (saturated steam), and HVAC circuits.

Temperature Range: -10℃ to 120℃, operating stably in cold water (e.g., groundwater) and moderately heated fluids (e.g., low-pressure steam, hot water loops).

Nominal Diameter: DN50 (2”), catering to small-to-medium flow rates in residential, commercial, and light industrial pipelines.

Connection Type: Flanged ends conforming to PN10/PN16 standards (GB/T 17241.6, EN 1092-1). Flanges feature precision-drilled bolt holes for alignment with pipeline flanges, ensuring leak-free installation with gaskets (typically EPDM or PTFE).

Operation Mode: Mechanical manual operation via a handwheel with a trapezoidal-thread stem. The handwheel rotates to raise or lower the gate, with a self-locking design to hold position—preventing unintended movement from vibration or pressure fluctuations.

Media Compatibility: Versatile for clean water, raw water, saturated steam (≤120℃), hot water, compressed air, mineral oil, and mildly corrosive fluids (pH 6–8), ensuring adaptability across sectors.

Design Standards: Complies with GB/T 12232 (cast iron gate valves) and EN 13709, ensuring compatibility with domestic and international pipeline systems.

Product Overview

III. Product Features

Newway DN50 telescopic soft seal mechanical gate valve stands out for features that enhance its functionality and reliability in industrial applications:

Telescopic Structure Flexibility: The telescopic inner cylinder slides within the outer body, accommodating axial displacement (±10mm) and minor angular misalignment (≤3°) caused by thermal expansion, pipeline settlement, or installation tolerances. This eliminates stress on valve flanges and pipeline joints, reducing leakage risks and extending system life—critical for outdoor or underground pipelines exposed to temperature swings.

Dual Sealing Reliability: The PTFE soft seal delivers bubble-tight shutoff for clean media, minimizing leakage to near-zero levels (ideal for water supply or steam systems where efficiency is key). Under high pressure or when handling fluids with minor particulates, the metal backup seal engages to maintain shutoff, preventing premature failure from soft seal wear.

Ductile Iron Durability: QT450 ductile iron resists cracking under impact (e.g., installation shocks, pipeline vibration) and corrosion in wet environments (via optional epoxy coating). Its toughness outperforms gray iron, ensuring the valve withstands harsh conditions in municipal or industrial settings.

Low Flow Resistance: The full-port design (gate fully retracts to open the entire DN50 diameter) minimizes pressure drop, ensuring efficient fluid transmission. This reduces energy consumption for pumps, a key advantage in circulation systems like HVAC loops.

Easy Installation and Alignment: Flanged connections simplify integration into existing pipelines, while the telescopic structure compensates for minor misalignment—reducing on-site fitting time and errors. The handwheel’s ergonomic design (knurled grip) ensures comfortable manual operation, even with frequent use.

Maintenance-Friendly Design: The stem packing (flexible graphite) is adjustable without disassembling the valve, allowing for quick replacement to prevent external leakage. The split-body structure enables access to internal components (gate, seals) for repair—reducing downtime compared to one-piece valves.