Flanged Gate Valve

Flanged Gate Valve Product Overview

The SIYelectric Flanged Gate Valve is an industrial isolation valve designed to start or stop fluid flow in a pipeline. It uses a gate-shaped disc inside the valve body. When the handwheel is turned to lift the gate, the flow passage opens. When the gate is lowered, the valve blocks the flow and isolates the pipeline.

Unlike ball valves, which use quarter-turn operation, gate valves are generally operated by multiple turns of a handwheel. They are especially suitable for applications where the valve is normally either fully open or fully closed, rather than frequently used for throttling.

The flanged connection provides a strong bolted joint to the piping system, making the valve suitable for larger pipelines and industrial installations that require reliable sealing, easy alignment, and convenient maintenance.

Product Description

A flanged gate valve is commonly used in piping systems where full flow capacity and low flow resistance are important. When the valve is fully open, the gate is lifted out of the flow path, allowing the medium to pass through with minimal obstruction.

SIYelectric flanged gate valves are manufactured by investment casting and are available in stainless steel materials such as CF8 / SS304, CF8M / SS316, and European material grades EN 10213 1.4308 / 1.4408. These material options allow the valve to be selected according to the medium, corrosion requirement, pressure, temperature, and project standard.

This valve can be supplied according to common international standards, including ASME B16.34, BS EN 12516-1, ASME B16.5, and BS EN 1092-1, making it suitable for international industrial projects, replacement applications, and process piping systems.

Key Features

Full Flow Isolation

When fully open, the gate is lifted away from the flow path, providing a straight-through passage and helping reduce pressure loss.

Flanged End Connection

The flanged design provides secure bolted installation and is suitable for industrial pipelines where strong connection and easy maintenance are required.

Stainless Steel Material Options

Available materials include CF8 / SS304, CF8M / SS316, 1.4308, and 1.4408. SS316 / 1.4408 is generally preferred for more corrosive media or harsher environments.

Investment Casting Construction

Investment casting helps provide accurate valve body dimensions, consistent surface quality, and stable mechanical performance for industrial service.

Suitable for On/Off Service

Gate valves are mainly used for full open or full close service. They are not usually recommended for precise flow regulation or frequent throttling.

International Standard Compatibility

Available with design and flange standards commonly used in global projects, including ASME and EN standards.

Technical Specifications

Applications

Water Supply Systems

Used in municipal water pipelines, industrial water supply systems, pumping stations, and distribution networks where reliable pipeline isolation is required.

Wastewater Treatment

Applied in wastewater treatment plants, filtration systems, sludge handling lines, and utility pipelines where durable shut-off valves are needed.

Oil and Gas Industry

Suitable for oil, gas, fuel, utility, and auxiliary process pipelines where full-flow isolation and robust construction are important.

Chemical Processing

Used in chemical process lines, compatible fluid pipelines, dosing systems, and utility systems. For corrosive media, CF8M / SS316 or 1.4408 material is usually recommended after confirming chemical compatibility.

Industrial Utility Pipelines

Applied in compressed air, cooling water, process water, oil, non-corrosive gas, and general plant utility systems.

HVAC and Building Services

Suitable for chilled water, hot water, cooling water, and other building service pipelines requiring flanged shut-off valves.

Advantages

• Straight-through flow path helps reduce pressure loss when the valve is fully open.
• Reliable on/off isolation for water, oil, gas, chemical, and utility pipelines.
• Flanged connection provides secure bolted installation and convenient maintenance.
• Wide size range from DN15 to DN300 for different pipeline systems.
• SS304 and SS316 material options support different corrosion and service requirements.
• ASME and EN standard options make the valve suitable for international projects.
• Investment casting body supports stable dimensions and consistent valve quality.
• API 598 and EN 12266-1 testing helps verify sealing and pressure performance.
• Suitable for high-flow pipeline applications where the valve is normally fully open or fully closed.

Selection Notes

When selecting a flanged gate valve, confirm the following details:

1. Pipeline size
   Confirm the required nominal size, such as DN15, DN50, DN100, DN200, or DN300.
2. Flange standard
   Confirm whether the pipeline requires ASME B16.5 or BS EN 1092-1 flange connection.
3. Design standard
   Choose ASME B16.34 or BS EN 12516-1 according to the project specification.
4. Material selection
   • CF8 / SS304 / 1.4308: suitable for water, air, mild media, and general industrial service.
   • CF8M / SS316 / 1.4408: better for chemical, coastal, or more corrosive environments.
5. Pressure rating
   Confirm whether the system requires 150 LBS, PN16, or another pressure class.
6. Operating mode
   Gate valves are better for isolation service. If the system needs frequent throttling or precise flow control, a globe valve or control valve may be more suitable.