Gaote Holding Group focuses on the research and development and production of various valves
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Explosion-Proof Electric Flanged Gate Valve | GTF Hazardous Area Flow Control
2026-08-26
Introduction
For petrochemical plants, gas distribution networks, coal chemical facilities and fine chemical production lines, fluid control in explosive atmospheres carries far higher requirements than standard industrial piping. Ordinary electric valves cannot meet electrical protection specifications for hazardous zones, creating hidden risks for daily operation and maintenance.
GTF explosion-proof electric flanged gate valves are purpose-built for these high-risk working conditions. They combine a heavy-duty flanged gate valve body with a certified flameproof multi-turn electric actuator, supporting both remote automated control and on-site manual override. Designed and manufactured in line with GB/T 12232-2025 and applicable explosion-protection specifications, our valves deliver dependable shutoff performance while conforming to hazardous-area installation rules.
Available in sizes DN50 to DN1000, pressure ratings PN10 to PN40, and both on-off and modulating control versions, they fit a wide range of dangerous-medium pipeline projects. As a participant in drafting multiple valve standards, GTF aligns product design and inspection procedures closely with industry norms, simplifying project acceptance for our clients.
Why Hazardous Area Operations Need Explosion-Proof Electric Gate Valves
In Zone 1 / Zone 2 explosive gas atmospheres, electrical arcing or overheating from standard actuators can trigger ignition of flammable media. A properly rated explosion-proof valve brings three core benefits:
- Contains internal arcs and sparks inside the flameproof housing, preventing flame propagation to the surrounding atmosphere.
- Supports remote automated operation, reducing on-site manual operation frequency and lowering personnel exposure risks.
- Maintains stable sealing performance under long-term cyclic operation, avoiding medium leakage that would worsen hazardous conditions.
Core Features of GTF Explosion-Proof Electric Flanged Gate Valves
1. Flameproof Electric Actuator for Certified Hazardous-Area Use
The actuator adopts a flameproof enclosure design, with all electrical components housed inside an independent pressure-resistant explosion-proof chamber. The housing is engineered to withstand internal overpressure from an internal ignition and stop flame transmission to the outside environment.
- Standard flameproof ratings: Exd II B / Exd II C, T4 temperature class, protection class IP65, suitable for most Group II hazardous gas environments.
- Dual cable gland entries separate power cables and signal cables, eliminating electromagnetic interference and ensuring stable control signals.
- Precision-machined flameproof surfaces with anti-corrosion treatment maintain long-term sealing performance of the explosion-proof joint.
- Built-in travel limit switches and over-torque protection prevent over-opening or over-closing damage to the valve body and sealing faces, extending service life.
- Top-mounted visual position indicator allows instant on-site confirmation of valve open/closed status.
2. Electric + Manual Dual Operation for Uninterrupted Flow Control
Under normal working conditions, the valve can be controlled remotely from the control room, supporting fully automated pipeline management and matching SCADA and DCS control systems.
In case of power failure, on-site commissioning or emergency conditions, operators can use the side-mounted handwheel to open or close the valve manually. No disassembly is required, which greatly reduces downtime risk for critical process lines.
3. Robust One-Piece Cast Body with Reliable Sealing
The valve body and flanges are integrally cast, eliminating welded-joint leakage risks. Wall thickness follows graded standard requirements for consistent pressure-bearing performance. The full-bore flow path minimizes pressure loss and supports efficient large-flow medium delivery.
Two sealing configurations are available to match different media:
- Resilient seat: Rubber-encapsulated wedge gate for tight zero-leakage shutoff, ideal for gas, clean water and refined oil services.
- Metal-to-metal seat: Hard-faced sealing surfaces with ≥2mm surfacing layer, wear and erosion resistant, suitable for chemical media with trace particles.
The gate runs on body guide rails throughout the travel, ensuring centered movement and even wear on sealing surfaces. The anti-blowout stem design prevents the stem from being ejected by internal pressure during packing maintenance, improving on-site operational safety.
4. Full Inspection Process for Smooth Project Acceptance
Every valve completes full factory verification before delivery, including shell strength test, sealing performance test, full-stroke operation test and explosion-proof structure inspection. We supply complete documentation packages to support project audit and acceptance procedures.
Face-to-face dimensions and flange connections follow universal industry standards, so the valves can be used for new construction projects as well as explosion-proof upgrade retrofits on existing pipelines.
Technical Specifications
| Parameter | Specification |
|---|---|
| Valve type | Rising-stem flanged explosion-proof electric gate valve |
| Nominal size | DN50 – DN1000 |
| Pressure rating | PN10, PN16, PN25, PN40 |
| End connection | Flanged, conforming to GB/T 9124 / HG/T 20592 |
| Body material | Ductile iron QT450-10, WCB cast steel, SS304 / SS316 |
| Seal type | Resilient seat (EPDM/NBR), metal hardfaced seat |
| Stem material | Stainless steel 2Cr13, SS304 |
| Flameproof rating | Exd II B / Exd II C, T4 class (optional) |
| Protection class | IP65 |
| Control mode | On-off type, modulating type |
| Power supply | AC220V, AC380V (customizable) |
| Applicable media | Gas, oil, chemical fluids, water, wastewater |
| Temperature range | -20℃ ~ 120℃ (standard); high-temperature version available |
Typical Applications
- Petrochemical & refining: Process pipelines, tank farm and unit area shutoff valves in explosive zones
- Gas transmission & distribution: City gas networks, gate stations and pressure regulating stations
- Coal chemical & oil storage: Production lines, storage terminals and long-distance pipeline valve chambers
- Fine chemical & pharmaceutical: Process lines handling flammable solvents and hazardous process fluids
Frequently Asked Questions
Q1: What flameproof ratings are available?
A: Standard configurations are Exd II B and Exd II C, both with T4 temperature class. Customized higher-grade solutions can be provided based on specific project hazard classification.
Q2: Can the valve be operated manually during power failure?
A: Yes. A side-mounted handwheel is provided as standard for manual override, so flow control remains available in blackout or emergency situations.
Q3: Are test and compliance documents supplied?
A: Yes. Each valve is delivered with product certificate, material test report, factory pressure test record and corresponding explosion-proof supporting documentation for project acceptance.
Q4: Can you supply modulating control for flow regulation?
A: Yes. Modulating versions with 4-20mA analog control are available for continuous flow and pressure regulation requirements.
Get Your Custom Valve Solution
If you need explosion-proof electric gate valves for hazardous-area fluid control projects, reach out to our technical sales team for datasheets, dimensional drawings, explosion-proof compliance documents and project quotations.
Official Website: www.gaotejituan.com
Email: gaotegroup@126.com
Tel: +86-595-88968800
GTF provides standardized, fully tested industrial valve solutions built to support safe and reliable operation of your hazardous-area fluid systems.
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Chenggong Development Zone, Ximei Street, Nan'an City, Quanzhou City, Fujian Province
Gaote Holding Group Co., Ltd.
Tel: +86-595-8896-8800
Email: gaotegroup@126.com
Address: Chenggong Development Zone, Ximei Street, Nan'an City, Quanzhou City, Fujian Province
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