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China No Pin Ductile Iron Lug Butterfly Valve Factory - High-Quality Suppliers for DN40-DN300 Size Valves
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)
Company Strength
With over 15 years of expertise, Tianjin Guoji Valve Co., Ltd. (TGV) takes pride in delivering not just products, but complete, high-performance flow control solutions tailored to your project needs. Our extensive portfolio—from ball valves and butterfly valves to expansion joints, strainers, actuators, and pipe fittings—ensures that we serve as your one-stop source for industries ranging from oil and gas to waterworks and HVAC. We understand that reliability, precision, and on-time delivery are critical to your operations. That's why every TGV product is backed by strict quality control, competitive pricing, and a responsive service team ready to support your specifications. Whether you are equipping a large-scale petrochemical plant or optimizing a municipal water system, we are here to provide engineered solutions that perform. Send us your inquiry today—share your detailed requirements, and let our technical experts offer you customized recommendations, quick turnaround, and a reliable partnership built on quality and trust.
Frequently Asked Questions
QWhat is a lug-type butterfly valve and how does it differ from a wafer-type butterfly valve?
A lug-type butterfly valve features threaded inserts (lugs) around the valve body, allowing it to be bolted to a pipeline from both sides independently. This means it can be used as an end-of-line valve or installed without removing the entire pipeline. In contrast, a wafer-type butterfly valve is sandwiched between two flanges and relies on the flange bolts to hold it in place, making it unsuitable for end-of-line service.
QWhat seat materials are available, and how do I choose the right one for my application?
We offer a wide range of seat materials including EPDM, NBR (Buna), Viton, PTFE, Hypalon, Silicone, and Neoprene. The selection depends on the media being handled, operating temperature, and chemical compatibility. For example, EPDM is ideal for water and mild chemicals, Viton suits high-temperature and aggressive chemical environments, and PTFE is preferred for highly corrosive media. Our technical team can assist you in selecting the most suitable material for your specific application.
QWhat pressure ratings are supported by this lug butterfly valve?
This lug butterfly valve supports pressure ratings of PN10, PN16, 150 PSI, 200 PSI, and Class 150. It complies with international standards including API609, EN593, EN558-1 Series 20, DIN3202 K1, and ISO5752, ensuring compatibility with global piping systems and project specifications.
QCan this butterfly valve be automated with an electric or pneumatic actuator?
Yes. The valve features a universal cast-in actuator mounting flange designed in accordance with ISO 5211 standard dimensions. This allows it to accommodate all types of operators, including 10-position handle kits, gear operators, electric actuators, and pneumatic actuators, providing flexibility for both manual and automated flow control systems.
QWhat industries and applications is this lug butterfly valve suitable for?
This valve is designed for a broad range of industries and applications, including HVAC systems, water supply and sewage treatment, food and beverage processing, chemical and petrochemical processing, power generation and utilities, paper and pulp manufacturing, and marine applications. Its wide material compatibility and robust design make it suitable for both clean and abrasive/erosive media.
QDoes TGV offer customized valve solutions, and what is the lead time?
Yes, Tianjin Guoji Valve Co., Ltd. (TGV) specializes in providing customized flow control solutions tailored to your project requirements. With over 15 years of industry experience, we offer a wide selection of body materials, seat materials, disc materials, and actuator configurations. Lead times vary depending on order specifications and quantity. We encourage you to submit your detailed requirements so our technical experts can provide prompt recommendations and competitive quotations.