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China One Piece Stem No Pin Lug Butterfly Valve Suppliers - Factory Direct DN25-DN1200 Size Options
⚙️ Features
- Guarantees a bubble‑tight seal at the valve's full pressure rating.
- Only two internal parts—the seat and the disc—make contact with the service medium.
- Tailored for demanding conditions involving abrasive or erosive fluids.
- Incorporates a cartridge‑style seat that can be replaced without removing the body from the line. The seat is constructed from a reinforced backing ring with the elastomer bonded to it by vulcanization. When the valve is sandwiched between pipeline flanges, the seat remains securely in place, resisting any deformation or movement. This cartridge design also eliminates problems such as elastomer stretching or bending ahead of the moving disc during operation.
- Supports a broad selection of material pairings.
- Fitted with a standardized actuator interface to facilitate straightforward swapping of operators.
- A top bushing manages side thrust forces.
- Sealing at the hub is accomplished through preloaded contact between the machined flat seat surface and the disc hub area, delivering a dependable seal regardless of disc position.
- The one‑piece, wafer‑thin disc and stem assembly creates minimal obstruction to flow.
- The seat is replaceable in the field, effectively isolating the body and stem from the fluid path.
- Built‑in molded O‑rings serve as flange seals, eliminating the requirement for additional gaskets.
- Universal mounting flange: The integrally cast actuator flange meets ISO 5211 dimensional specifications, making it compatible with a full range of operators—including 10‑position handle kits, gear drives, 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 |
🏗️ HVAC
💧 Water Supply & Sewage
🍽️ Food & Beverage
⚗️ Chemical / Petrochemical
⚡ Power & Utilities
📄 Paper & Pulp
🚢 Marine
📐 Dimensions (mm)
🔍 More Details
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.
❓ Frequently Asked Questions
Q What makes the lug butterfly valve suitable for dead-end service?
The lug-style design features threaded inserts on both sides of the valve body, allowing it to be bolted independently to each pipeline flange. This means one side of the pipeline can be removed while the valve remains in place and maintains a seal, making it ideal for dead-end or end-of-line service applications.
Q Can the seat be replaced without removing the valve from the pipeline?
Yes. The valve features a cartridge-style seat design that allows field replacement without removing the body from the pipeline. The seat is constructed from a reinforced backing ring with a vulcanized elastomer, ensuring it stays securely in position between the pipeline flanges during operation and replacement.
Q What seat and disc materials are available for corrosive or special media?
A wide range of materials is available to suit various media. Seat options include EPDM, NBR, Viton, PTFE, Hypalon, Silicone, and Neoprene. Disc options include CF8, CF8M, CF3M, Duplex Stainless Steel, Al-Bronze, DI+PTFE, and DI Epoxy coated, allowing the valve to handle water, chemicals, food-grade fluids, and abrasive media.
Q Which actuator types are compatible with this valve?
The valve body features an integrally cast actuator flange that complies with ISO 5211 dimensional specifications. This universal mounting interface is compatible with a full range of operators, including 10-position handle kits, gear drives, electric actuators, and pneumatic actuators, enabling easy and standardized actuator swapping.
Q What pressure ratings and international standards does this valve meet?
The valve is rated for PN10, PN16, 150 PSI, 200 PSI, and Class 150. It conforms to major international standards including API 609, EN 593, EN 558-1 Series 20, DIN 3202 K1, and ISO 5752 for face-to-face dimensions, and supports flange drilling to EN1092, JIS, ANSI 150, AS Table D/E, and SANS standards.
Q Does the valve require separate gaskets for flange connections?
No additional gaskets are required. The valve seat incorporates built-in molded O-rings that serve as integrated flange seals. When the valve is clamped between pipeline flanges, these O-rings provide a reliable sealing function, simplifying installation and reducing the number of components needed in the pipeline system.