OEM 18" Hard Back Seat Lug Butterfly Valve with Pin DN450 PN10 Manufacturer, Exporters
Product Description
Hard Back Seat Butterfly Valve
The valve seat is wrapped in rubber in a hard support ring, making the structure more stable and wear-resistant. The disadvantage is that the seat ring is usually not removable and replaceable (non-resilient replaceable seat), but the reliability is higher.
Lug Style Butterfly Valve
There are independent lugs on both sides of the valve body, which are respectively fixed to the pipe flange with bolts, suitable for pipeline disassembly on one side (such as end isolation). Commonly used in dead-end services, fire piping networks, process piping, etc.
Pin (pin connection) Butterfly Valve
The valve disc and valve stem are connected by pins to transmit torque. The structure is simple and the assembly is reliable. Particularly common in hard-backed seat configurations, as this design has less need for a removable seat.
Worm Gear Butterfly Valve
Butterfly valves larger than DN300 are generally equipped with gearboxes and handwheels. The worm gear reduction mechanism reduces the operating torque, making it easier to open and close large butterfly valves. Especially in high-pressure systems, it is better than small valves operated by direct handles.
| Size & Pressure Rating & Standard | |
|---|---|
| Size | DN40-DN1200 |
| Pressure Rating | PN10, PN16, CL150, JIS 5K, JIS 10K |
| Face to Face STD | API609, BS5155, DIN3202, ISO5752 |
| Connection STD | PN6, PN10, PN16, PN25, 150LB, JIS5K, 10K, 16K, GOST33259 |
| Upper Flange STD | ISO 5211 |
| Material | |
| Body | Cast Iron(GG25), Ductile Iron(GGG40/50), Carbon Steel(WCB A216), Stainless Steel(SS304/SS316/SS304L/SS316L), Duplex Stainless Steel(2507/1.4529), Bronze, Aluminium Alloy |
| Disc | DI+Ni, Carbon Steel(WCB A216), Stainless Steel(SS304/SS316/SS304L/SS316L), Duplex Stainless Steel(2507/1.4529), Bronze, DI/WCB/SS lined with PTFE |
| Stem/Shaft | SS416, SS431, SS304, SS316, Duplex Stainless Steel, Monel |
| Seat | EPDM |
| Bushing | PTFE, Bronze |
| O Ring | NBR, EPDM, FKM |
| Actuator | Hand Lever, Gear Box, Electric Actuator, Pneumatic Actuator |
What are the primary advantages of a hard back seat butterfly valve?
A hard back seat incorporates an elastomer vulcanized or molded over a rigid support ring. This design prevents seat distortion, stretching, or collapse during high fluid velocity or cycling, resulting in superior dimensional stability, wear resistance, and long-term sealing performance compared to loose soft seats.
Why should I choose a lug style butterfly valve over a wafer style?
Lug style valves have threaded bolt lugs surrounding the body that connect independently to piping flanges on either side. This allows the downstream pipe section to be dismantled for maintenance while the valve maintains end isolation on the pressurized upstream line (dead-end service).
When is a worm gear operator necessary instead of a lever handle?
A worm gearbox is generally standard for valves DN300 and larger, or in high-pressure differential applications. It provides mechanical advantage to reduce operating torque, facilitates precise flow throttling, and prevents rapid closing which can trigger catastrophic water hammer.
How does a pin connection disc ensure valve reliability?
A pin connection mechanically locks the stem and disc using precision-tapered or cylindrical pins. This configuration delivers robust, slip-free torque transfer under demanding high-cycle service, making it ideal for robust, hard-backed configurations.
Can these butterfly valves be easily fitted with automatic actuators?
Yes, these butterfly valves are manufactured with standard ISO 5211 mounting pads. This enables standardized mounting and fast field conversion to pneumatic, electric, or hydraulic quarter-turn actuators without requiring custom brackets.
What flange connection standards are compatible with this valve series?
The valve design supports multiple flange drillings across global standards, including EN/DIN PN6/PN10/PN16/PN25, ANSI Class 150, JIS 5K/10K/16K, and GOST 33259, ensuring seamless integration into varied piping infrastructures.
