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China Factory Suppliers Wafer Butterfly Valve - No-Pin Design, Sizes DN25-DN1200, Various Materials Available
⚙ 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.
❓ Frequently Asked Questions (FAQ)
QWhat is a lugged butterfly valve and how does it differ from a wafer type?
A lugged butterfly valve features threaded inserts (lugs) around its body, allowing it to be bolted directly to a single pipe flange without requiring a mating flange on the other side. This makes it suitable for dead-end service. A wafer-type valve, by contrast, is sandwiched between two flanges and relies on both flanges for support, making it unsuitable for end-of-line installation.
QWhat seat materials are available and how do I choose the right one?
We offer a wide range of seat materials including EPDM, NBR (Buna), Viton, PTFE, Hypalon, Silicone, and Neoprene. The correct choice depends on the media and operating conditions: EPDM is ideal for water and steam; NBR suits oil and fuel applications; Viton excels in high-temperature and chemical environments; PTFE is recommended for highly corrosive or pure media applications.
QWhat pressure ratings does this butterfly valve support?
This butterfly valve is rated for PN10, PN16, 150 PSI, 200 PSI, and Class 150 pressure ratings, making it compatible with a wide range of industrial and commercial piping systems across global standards.
QWhat types of actuators can be mounted on this valve?
The cast-in actuator flange is designed in accordance with ISO 5211 standard dimensions, making it compatible with all major operator types, including 10-position handle kits, gear operators, electric actuators, and pneumatic actuators. This universal design simplifies upgrades and operator interchangeability in the field.
QIs the seat replaceable without removing the valve from the pipeline?
Yes. The cartridge seat design allows for field replacement. The reinforced back-up ring and vulcanized elastomer seat can be replaced without removing the entire valve body from the pipeline, minimizing downtime and maintenance costs. The design also prevents deformation during cycling, extending the service life of the seat.
QWhat industries and applications is this valve suitable for?
This butterfly valve is widely used across multiple industries 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 broad material compatibility and compliance with international standards make it a versatile solution for demanding environments.