| Brand | Y.D.K |
| Model | KBF(WH)-16 |
| Pressure Standard | PN10, PN16 |
BTL LEVER-OPERATED BUTTERFLY VALVE | MODEL: D71X-10
| Brand | BTL |
| Origin | China |
| Nominal pressure | PN10 / PN16 & JIS 10K |
| Design Standard | BS4504 |
| Connection Standard | EN558 & ISO 5752 Series-20 |
| Shell Test | 2.4 MPa |
| Seal test | 1.76 MPa |
| Maximum working temperature | 120°C / 80°C |
The BTL lever-operated butterfly valve, Model D71X-10, is a quick and flexible open/close solution for small to medium-sized pipelines. Thanks to a locking lever handle that can be set at multiple angles, the operator can easily open and close the flow as desired. With an ultra-thin wafer-type design, the valve saves installation space and significantly reduces the load on the piping system.

Construction of the BTL D71X-10 lever-operated butterfly valve
The BTL D71X-10 lever-operated butterfly valve uses a lever that acts directly on the stem, so opening and closing are faster, which suits systems that need instant shut-off and opening of the flow.
The product consists of 6 main parts:
| No. | Component | Material | Function |
|---|---|---|---|
| 1 | Body | Cast iron | Thin disc-type valve shell, clamped between two pipeline flanges with through-bolts, containing the cavity for the disc and the stem |
| 2 | Disc | DI/CF8/CF8M | Main opening/closing element, rotating 90 degrees about the stem axis to close the flow tightly or open it fully |
| 3 | Stem | Stainless steel | Drive shaft connected directly from the lever to the disc, bearing the entire torque during operation |
| 4 | Seat | EPDM/NBR | Sealing ring molded inside the valve body, surrounding the perimeter of the disc and forming the seal when the disc is closed. The material is selected according to the temperature and properties of the fluid |
| 5 | Sleeve | Polymer | Intermediate bushing between the stem and the valve body, reducing friction during rotation and preventing leakage along the stem |
| 6 | Lever handle | Steel/Aluminum/Cast iron | Manual operating mechanism, with an opening angle indicator plate and a locking pin at the closed, open, and intermediate positions |
Dimension table of the BTL D71X-10 lever-operated butterfly valve (DN50 – DN400)
| DN | L (Body length – mm) | D0 (Bolt circle diameter – mm) | Z x Φd (No. of holes × hole diameter) |
|---|---|---|---|
| 50 | 43 | Φ125 | 4 x Φ19 |
| 65 | 46 | Φ145 | 4 x Φ19 |
| 80 | 46 | Φ160 | 4 x Φ19 |
| 100 | 52 | Φ180 | 4 x Φ19 |
| 125 | 56 | Φ210 | 4 x Φ19 |
| 150 | 56 | Φ240 | 4 x Φ23 |
| 200 | 60 | Φ295 | 4 x Φ23 |
| 250 | 68 | Φ355 | 4 x Φ23 |
| 300 | 78 | Φ410 | 4 x Φ26 |
| 350 | 78 | Φ400 | 4 x Φ26 |
| 400 | 102 | Φ456 | 4 x Φ30 |
Advantages and practical applications of the D71X-10 lever-operated butterfly valve
Outstanding advantages of the BTL lever-operated butterfly valve
- Nearly instant opening and closing is the biggest advantage of the lever-operated butterfly valve compared with other butterfly valve types. Simply squeeze and hold the latch while turning the lever through 90 degrees in one continuous motion to complete opening or closing. For applications that need a fast response, for example emergency isolation of a pipeline branch when a problem occurs, the lever-operated butterfly valve has the advantage in operating time.
- Simpler construction with fewer internal mechanical parts, so it costs less and has fewer potential failure points. It does not need periodic gear lubrication as a gear-operated butterfly valve does, reducing routine maintenance work.
- Lighter weight and a more compact actuating assembly, suitable for installation in locations with limited space.
Despite its many advantages, the BTL lever-operated butterfly valve still has some limitations in large-diameter or high-pressure piping systems. For larger sizes from DN200 and up, operating by lever becomes heavy and hard to control smoothly, and quick closing easily causes sudden impact on the seat; over time this affects the service life of the sealing seat. In this case, customers should consider the BTL handwheel (gear-operated) butterfly valve range from An Phu Thanh.
Practical applications of the BTL lever-operated butterfly valve
With the characteristics above, the BTL D71X-10 lever-operated butterfly valve is typically preferred in the following cases:
- Small and medium-sized pipelines, most commonly in the DN50 to DN200 range, where the operating effort is still light and no gearbox torque-reduction mechanism is needed.
- Locations that need frequent, quick open/close operation, for example isolation valves on auxiliary branches, equipment inlet valves that must be switched on and off in short cycles during the day, or inspection and maintenance points that must be opened and closed repeatedly.
- Residential HVAC systems and small to medium projects, where the main requirement is simple on/off operation, without the need for highly precise flow regulation.
- Easily accessible locations, where the operator can work directly by hand without much open space. Examples are valves installed in technical rooms, on walls, or at low positions within easy reach.

An Phu Thanh – Supplier of genuine BTL D71X-10 lever-operated butterfly valves in Ho Chi Minh City
If you are looking for a fast, flexible open/close solution for water supply and drainage pipelines, fire protection systems, or HVAC systems, the BTL D71X-10 lever-operated butterfly valve is an optimal choice. An Phu Thanh is currently the official distributor of this product line in Ho Chi Minh City and nationwide at the most competitive prices. With the advantage of direct import, we are committed to delivering quality-standard products from the BTL brand in a wide size range from DN50 to DN400, ready to quickly meet every installation requirement of your project.
When you order BTL lever-operated butterfly valves from An Phu Thanh, you can be fully confident in the origin of the products, with complete CO and CQ certificates and a genuine warranty. Our experienced technical team is always ready to help check technical specifications and advise on the disc and seat materials suited to the operating medium, helping your project optimize costs and ensure stable operation.

An Phu Thanh applies competitive selling prices, attractive discounts for project and contractor orders, and fast delivery nationwide. Contact us now via Hotline/Zalo OA 0946 729 913 to receive a quotation and detailed consultation!
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