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China Suppliers Factory No-Pin Design Wafer Butterfly Valve DN25-DN1200 with Various Material Options
★ Features
✓Bubble-tight shut-off at full pressure rating
✓The seat and the disc are the only two valve parts in contact with the medium.
✓Superior design for abrasive and erosive media.
✓Replaceable cartridge seat — The replaceable seat consists of a reinforced back-up ring, on which the elastomer seat material is vulcanized. When mounting the valve between the pipe flanges this stable seat cannot be deformed or displaced. The cartridge design also prevents deformation when the valve is cycled, such as stretching and bending of the elastomer in front of the moving disc.
✓Large number of material combinations available.
✓Standardized actuator flange for easy operator interchangeability.
✓Top bushing absorbs side thrust loads.
✓Hub seal provided by preloaded contact between flatted seat surface and disc hub area for positive sealing at all disc positions.
✓One-piece wafer thin disc stem gives the very minimum obstruction to flow.
✓Field replaceable seat isolates the body and stem from the flow.
✓Molded-in O-rings provides flange sealing and eliminates need for gaskets.
✓Universal Mounting Flange — The cast-in actuator flange is universally designed in accordance with ISO 5211 standard dimensions. The mounting flange can accommodate all types of operators such as: 10-position handle kits, gear operators, electric actuators, and pneumatic actuators.
⚙ Materials Of Main Parts
| ITEM | PART NAME | MATERIAL |
|---|---|---|
| 1 | Body Material | Cast iron / Ductile iron / CF8 / CF8M / WCB / Duplex / Al-Bronze / Aluminium Etc. |
| 2 | Seat Material | EPDM / NBR / Buna / Viton / PTFE / Hypalon / Silicone / Neoprene Etc. |
| 3 | Stem Material | 45# / SS420 / SS410 / SS416 / SS316 / SS304 / Duplex stainless steel Etc. |
| 4 | Disc Material | DI+Ni, CF8, CF8M, CF3M, Duplex SS, Al-Bronze, DI+Nylon, DI+PTFE, DI Epoxy Etc. |
| 5 | Hand Lever | Malleable iron / Stamping steel / Aluminum / Stainless Steel |
| 6 | Bushing | PTFE / Bronze |
| 7 | O Ring | NBR / EPDM / VITON |
📒 Valve Standard
| Category | Details |
|---|---|
| Type | Lugged |
| Face to Face | API609, EN593, EN558-1 Series 20, DIN3202 K1, ISO5752 |
| Flange Drilling | EN1092 PN6 / PN10 / PN16 / JIS 5K / 10K / ANSI150 / AS Table D/E / SANS |
| Mounting Flange | ISO5211 |
| Pressure Rating | PN10 | PN16 | 150PSI | 200PSI | Class 150 |
| Application | HVAC, Water Supply & Sewage, Food & Beverage, Chemical/Petrochemical Processing, Power and Utilities, Paper and Pulp, Marine |
📏 Dimensions (mm)
🔍 More Details
🏢 Company Strength
Tianjin Guoji Valve Co., Ltd. (TGV) has been a trusted name in valve manufacturing and export since 2007. We specialize in a broad spectrum of products—ball valves, gate valves, globe valves, check valves, butterfly valves, expansion joints, strainers, actuators, flanges, and pipe fittings—offering complete solutions for the oil and gas, petrochemical, HVAC, and waterworks sectors. Our commitment to strict quality control, competitive pricing, fast responsiveness, and on‑time delivery ensures that every order meets the highest standards. Whether you need standard components or custom‑engineered solutions, we are equipped to support your project with reliability and expertise. Ready to move forward? Simply send us your inquiry—we'll respond promptly with detailed information, a competitive quote, and the dedicated service you deserve.
Tianjin Guoji Valve Co., Ltd. is an export-oriented valve manufacturer with 15,332 square meter factory area, which has strong capability of R&D, Manufacture, Trading and Service. Now our company has passed the Lloyd's Register (LR) ISO9001: 2015 quality management system certification (ISO Approval number: ISO 9001 – 00033059) and CE/PED certification (EU Certificate Of Conformity). (Certificate No: 0343/PED/SHA/BJG00001668/A).
TGV's products covered Butterfly valves, Check valves, Strainers, Gate valves, Ball valves, Globe valves, Expansion joints, Flanges and Fittings with pressure range from 0.5 to 6.4 MPa, size from DN15 to DN3000. The products also have been widely exported to more than 30 countries and regions.
We aim at deliver only quality valves with professional services, we see quality and service as life and always take our reputation and promises seriously.
TGV's products covered Butterfly valves, Check valves, Strainers, Gate valves, Ball valves, Globe valves, Expansion joints, Flanges and Fittings with pressure range from 0.5 to 6.4 MPa, size from DN15 to DN3000. The products also have been widely exported to more than 30 countries and regions.
We aim at deliver only quality valves with professional services, we see quality and service as life and always take our reputation and promises seriously.
❓ Frequently Asked Questions (FAQ)
Q
What is a lugged butterfly valve and how does it differ from a wafer butterfly valve?
A lugged butterfly valve features threaded inserts (lugs) around the valve body, allowing it to be bolted directly between two flanges independently on each side. This makes it suitable for dead-end service where one side of the pipeline can be removed without disturbing the other. A wafer butterfly valve, by contrast, is clamped between two flanges using through-bolts and is not designed for dead-end service.
Q
What seat materials are available and how do I choose the right one for my application?
Available seat materials include EPDM, NBR (Buna), Viton, PTFE, Hypalon, Silicone, and Neoprene. The choice depends on the media and temperature: EPDM is ideal for water and mild chemicals; NBR suits oil and fuel service; Viton is recommended for high-temperature and aggressive chemical environments; PTFE offers the broadest chemical resistance for highly corrosive media.
Q
What pressure ratings does this butterfly valve support?
This butterfly valve supports pressure ratings of PN10, PN16, 150 PSI, 200 PSI, and ANSI Class 150, making it suitable for a wide range of industrial and commercial piping systems including HVAC, water supply, and chemical processing applications.
Q
What types of actuators are compatible with this valve?
The valve features a universal ISO 5211 mounting flange that is compatible with all standard operator types, including 10-position handle kits, gear operators, electric actuators, and pneumatic actuators. This standardized interface ensures easy interchangeability and simplifies automation upgrades.
Q
Can the seat be replaced in the field without removing the entire valve?
Yes. The cartridge seat design allows for field replacement without removing the valve body from the pipeline. The reinforced back-up ring and vulcanized elastomer construction ensures the seat remains stable and undistorted during installation and valve cycling, minimizing downtime and maintenance costs.
Q
What quality certifications does Tianjin Guoji Valve Co., Ltd. hold?
TGV holds Lloyd's Register (LR) ISO 9001:2015 quality management system certification (ISO Approval No.: ISO 9001 – 00033059) and CE/PED certification (EU Certificate of Conformity, Certificate No.: 0343/PED/SHA/BJG00001668/A). These certifications reflect our commitment to delivering valves that meet the highest international quality and safety standards.