I. Product Overview
The flanged non-rising stem gate valve for fire protection systems features a flanged connection at both ends of the valve body, secured to pipeline flanges with bolts. Its core characteristic is the non-rising stem design, where the stem remains concealed within the valve body and does not move during operation. The stem is threaded to the gate, which moves vertically inside the body to open or close the valve. The gate and seat adopt a flat sealing structure, paired with water-resistant sealing materials to ensure reliable sealing performance.
This valve is specifically designed for fire protection applications. It is suitable for clean water media, with operating temperatures ≤80℃ and working pressure ≤1.6 MPa. Typical applications include automatic sprinkler systems, fire hydrant systems, and underground fire pipelines in space-constrained environments. Its compact non-rising stem design saves installation space and ensures stable operation of fire protection systems in confined areas.
II. Product Features
Non-Rising Stem Design The stem is concealed within the valve body and remains stationary during gate movement. The compact structure minimizes space usage, making it ideal for installations in underground pipelines, ceiling cavities, and other tight spaces, reducing the overall footprint of the piping system.
External Position Indicator Equipped with a dial or pointer-style indicator, the valve’s open/closed status can be visually monitored from the outside. This compensates for the non-rising stem’s lack of direct visibility and meets the fire system’s requirement for valve status monitoring.
High-Strength Flanged Connection The flanged ends provide strong mechanical connection and excellent sealing performance, capable of withstanding pressure fluctuations in fire pipelines. Compatible with various pipe diameters, the connection ensures installation stability and facilitates maintenance and replacement.
Precision Flat Sealing The gate and seat are precisely machined to form a flat sealing surface. When closed, the seal is tight and effective, preventing leakage of fire media and maintaining system pressure stability—meeting the sealing requirements of fire protection conditions.
Durable Materials and Corrosion Resistance The valve body is made of ductile iron or cast steel, with anti-corrosion treatment for enhanced rust resistance. The stem and gate are made of high-quality alloy steel, and the threaded drive components are specially lubricated for wear resistance and anti-seizing, ensuring long service life and reliable standby performance in fire systems.
Efficient Flow in Full Open Position When fully open, the gate is completely lifted, allowing unobstructed flow with minimal resistance. This ensures rapid delivery of fire media during emergencies and meets high-volume water supply demands. Manual operation is standard (with optional electric actuator), offering moderate torque and smooth control for quick response in urgent situations.
III. Main Standards
The valve’s design, performance, and installation comply with the following national and industry standards:
• GB 5135.6-2019 – Automatic Sprinkler System – Part 6: General Valves • GB/T 12234-2019 – Steel Gate Valves for Petroleum, Petrochemical, and Related Industries • Mandatory certification standards for fire protection products
Specific technical parameters, performance indicators, and installation guidelines should be based on the product’s factory-issued technical documentation.
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