Q341F Worm Gear Operated Ball Valve
• Worm gear operated flanged ball valve for low-torque pipeline control
• Bi-directional sealing with PTFE/hard seat options (≤150℃ / ≤450℃)
• PN16/25/40 pressure ratings, DN15-DN300 full size range
• Fire-safe & anti-static design for industrial applications
• WCB/304/316 materials compatible with water, gas, oil and corrosive media
Gaoshan Valve Q341F Worm Wheel Operated Ball Valve
Industrial Flanged Ball Valve with Low-Torque Worm Gear Actuation
Product Brief Highlights
- Low-Torque Worm Gear Operation: Precision gearbox reduces operating torque for effortless 90° quarter-turn control.
- Bi-Directional Sealing: Dual-seat design ensures tight shutoff in both flow directions with zero leakage.
- Multi-Seat Options: PTFE soft seat (≤150℃) or cobalt-based hard seat (≤450℃) for diverse working conditions.
- Full Compliance Standards: Designed per GB/T12237, ANSI B16.34 and API 6D for industrial safety requirements.
- Corrosion-Resistant Construction: WCB/304/316 body materials compatible with water, oil, gas and corrosive media.
- Anti-Misoperation Design: Scale indicator and locking mechanism prevent accidental actuation.
1. Product Overview
The Q341F worm wheel operated ball valve is a high-performance industrial valve designed for pipeline shutoff and flow regulation. It features a floating/fixed ball structure with flanged connections, driven by a precision worm gearbox to minimize operating torque. With full bore design, the valve offers minimal flow resistance, allowing media to pass through with nearly zero pressure loss.
Available in PN16, PN25 and PN40 pressure ratings, this valve supports a wide range of working temperatures from -28℃ to 450℃, depending on seat material. It is widely used in petrochemical, power generation, water treatment and natural gas systems, offering reliable performance, long service life and easy maintenance.
2. Key Features
- Worm Gear with Scale Indicator: Clear opening angle scale for precise flow control and operation feedback.
- Bi-Directional Sealing Performance: Dual-seat design enables tight shutoff in both flow directions without installation restrictions.
- Premium Seat Materials: PTFE soft seat (low friction, ≤150℃) or cobalt-based hard seat (high temperature/wear resistance, ≤450℃).
- Low Operating Torque: Precision machined ball and gearbox reduce friction, enabling easy actuation even at high pressures.
- Anti-Misoperation Locking: Lockable position pin prevents accidental opening/closing for enhanced safety.
- Fire-Safe & Anti-Static Design: Compliant with API 6D fire-safe requirements and equipped with anti-static device for flammable media.
- Full Bore Structure: Straight-through flow path minimizes pressure drop and allows pipeline pigging operations.
3. Technical Specifications
| Parameter | Specification |
|---|---|
| Model Series | Q341F-16Q/C, Q341F-25Q, Q341F-25, Q341F-40, Q341H/Y |
| Nominal Diameter | DN15 ~ DN300 |
| Nominal Pressure | PN16 (1.6MPa), PN25 (2.5MPa), PN40 (4.0MPa) |
| Working Temperature | -28℃ ~ 150℃ (PTFE seat); -28℃ ~ 450℃ (hard seat) |
| Applicable Media | Water, Steam, Oil, Gas, Natural Gas, Acid/Alkali Corrosive Media |
| Connection Type | Flanged (ASME B16.5 / GB/T9113) |
| Operation Type | Worm Gear Actuation (Manual) |
| Design Standards | GB/T12237, GB/T12221, GB/T9113, JB/T9092, ANSI B16.34, API 6D |
4. Materials of Construction
| Part Name | Material (GB Standard) | Material (ASTM Standard) |
|---|---|---|
| Valve Body | WCB / CF8 / CF8M | A216-WCB / SS304 / SS316 |
| Ball | 1Cr18Ni9Ti / CF8 / CF8M | SS304 / SS316 |
| Stem | 1Cr13 / 2Cr13 / 304 | A276-410 / SS304 |
| Seat Seal | PTFE / Enhanced PTFE / Cobalt-Based Alloy | PTFE / Stellite Alloy |
| Packing | PTFE / Flexible Graphite | PTFE / Flexible Graphite |
| Fasteners | 35CrMoA / 35 / Q235 | A193-B7 / A194-2H |
5. Structure Drawing & Dimensions
Q341F Flanged Ball Valve External Structure Diagram
| DN(mm) | L (mm, PN16/25) | L (mm, PN40) | D(mm) | D1(mm) | D2(mm) | Z-φd | b(mm) | H(mm) |
|---|---|---|---|---|---|---|---|---|
| 15 | 130 | 130 | 95 | 65 | 45 | 4-14 | 14 | 78 |
| 20 | 140 | 152 | 105 | 75 | 55 | 4-14 | 14 | 84 |
| 25 | 160 | 165 | 115 | 85 | 65 | 4-14 | 14 | 95 |
| 32 | 165 | 178 | 135 | 100 | 78 | 4-18 | 16 | 150 |
| 40 | 180 | 190 | 145 | 110 | 85 | 4-18 | 16 | 150 |
| 50 | 200 | 216 | 160 | 125 | 100 | 4-18 | 16 | 170 |
| 65 | 220 | 241 | 180 | 145 | 120 | 4-18 | 18 | 195 |
| 80 | 250 | 283 | 195 | 160 | 135 | 8-18 | 20 | 215 |
| 100 | 280 | 305 | 215 | 180 | 155 | 8-18 | 20 | 250 |
| 125 | 320 | 381 | 245 | 210 | 185 | 8-18 | 22 | 265 |
| 150 | 360 | 403 | 280 | 240 | 210 | 8-23 | 25 | 270 |
| 200 | 400 | 502 | 335 | 295 | 265 | 12-23 | 26 | 330 |
| 250 | 450 | – | 405 | 355 | 320 | 12-25 | 30 | 450 |
| 300 | 610 | – | 460 | 410 | 375 | 12-25 | 30 | 510 |
6. Installation & Maintenance Guidelines
- Clean the pipeline thoroughly before installation to remove debris that may damage the valve seat and ball surface.
- The valve can be installed in any direction, but align the flow direction with the marked arrow on the valve body.
- Tighten flange bolts evenly in a crisscross pattern to ensure uniform sealing pressure and prevent leakage.
- Do not use the worm gear handle as a lifting point to avoid damaging the actuator mechanism.
- Regularly lubricate the worm gearbox with appropriate grease to maintain smooth operation and extend service life.
- Periodically inspect sealing performance and replace worn PTFE packing or seat seals to prevent media leakage.
- For high-temperature applications, perform a pressure test before commissioning to ensure tight shutoff performance.
7. Typical Applications
Q341F worm gear ball valves are widely used in industrial pipeline systems requiring reliable shutoff and flow control:
- Petrochemical & Refining Plants (oil, gas, and corrosive media pipelines)
- Natural Gas Transmission & Distribution Systems
- Power Generation Plants (steam, water, and fuel supply systems)
- Water Treatment & Municipal Water Supply Networks
- Pharmaceutical & Food Processing Industries (sanitary grade optional)
- Mining & Metallurgy (slurry and process fluid pipelines)
Request a Custom Quote
Gaoshan Valve provides high-quality Q341F worm gear ball valves with custom materials, pressure ratings, and optional actuators (pneumatic/electric) to meet your project requirements. We offer competitive pricing, fast delivery, and comprehensive after-sales support for industrial clients worldwide.
Email: sales@gaoshanvalves.com | Tell us your size, material, and quantity needs!