A wafer butterfly valve is a short-face-to-face, quarter-turn valve installed between two standard pipe flanges. The compact wafer body makes it a practical choice for isolation and flow control in water treatment, water supply, wastewater, HVAC, and industrial water systems.
The centerline, or concentric, configuration places the shaft through the center of the disc and pipe bore. In this design, the disc-to-shaft connection is important because the shaft must drive the disc through its full operating stroke without slipping or losing angular position. In this product, that connection is made by a pin.
The pin connection locks the disc hub to the shaft. As the operator or actuator rotates the shaft, the pin carries that rotational movement into the disc. The pin therefore performs two main functions:
This direct connection is especially relevant in centerline butterfly valves because the disc must rotate accurately around the shaft centerline to produce consistent contact with the resilient seat around the full circumference of the bore.
| Pin Connection Aspect | Technical Purpose |
|---|---|
| Disc-to-shaft joint | Connects the disc hub and shaft at the required drive position. |
| Torque transfer | Transmits the quarter-turn shaft motion into the disc. |
| Rotation control | Maintains the angular relationship between the shaft and disc. |
| Operation consistency | Supports repeatable disc movement from fully open to fully closed. |
The pin joins the disc hub to the shaft for direct drive between the operator and the valve disc.
The concentric shaft and disc arrangement provides a simple, compact quarter-turn valve structure.
The shaft and disc rotate together through the pin connection, supporting consistent opening and closing response.
The short wafer body fits between pipe flanges and supports compact, space-saving pipeline layouts.
The following table provides a project-oriented specification overview. Exact dimensions, pressure ratings, flange standards, and performance values must be confirmed by the Laux Valve engineering team according to the selected size, material, and application.
| Item |
Specification |
|---|---|
| Product | Wafer Butterfly Valve with Locating Pin |
| Valve Design | Centerline / Concentric |
| Disc-to-Shaft Connection | Pin |
| Body Style | Wafer |
| Pressure Rating | To be confirmed according to project requirements |
| Nominal Size | To be confirmed according to project requirements |
| Face-to-Face | Available upon request |
| Flange Drilling | Available upon request |
| Temperature Range | Dependent on selected seat material |
| Standards | To be confirmed according to project requirements |
| Leakage Class | To be confirmed according to project requirements |
| Mounting | ISO 5211 to be confirmed according to project requirements |
Material selection depends on the operating medium, temperature, pressure, corrosion conditions, and application requirements. Laux Valve can configure the valve to match the project specification.
| Component | Available Material Options |
|---|---|
| Body | DI, WCB, CF8, CF8M, Al-Bronze |
| Disc | Plated Ductile Iron, CF8, CF8M, Duplex, Bronze, Aluminum Bronze, Nylon Coated, PTFE Lined |
| Shaft | SS420, SS316, 17-4PH, Duplex |
| Seat | EPDM, NBR, High Temperature EPDM, FKM, PTFE |
| Actuator | Typical Use |
|---|---|
| Lever Handle | Manual operation for smaller sizes and lower torque applications |
| Gear Operator | Manual operation for larger sizes or higher torque requirements |
| Electric Actuator | Remote or automated on-off and modulating service |
| Pneumatic Actuator | Fast on-off service and automated process control |
ISO 5211 mounting can be confirmed according to the selected valve size and project requirements.
A centerline butterfly valve depends on accurate disc movement around the shaft centerline. If the disc slips or rotates relative to the shaft, the valve may not reach its intended closed position, seat contact may become inconsistent, and actuator position feedback may no longer represent the actual disc position.
The pin connection provides a direct mechanical link between the shaft and disc. This helps keep the disc drive predictable and simplifies the relationship between operator input and valve position. The specific pin configuration, size, and material should be selected by the manufacturer according to the valve size, operating torque, and service conditions.
Standard testing items may include:
Exact test methods, pressures, and acceptance criteria should be confirmed according to the project specification.
Laux Valve provides OEM and customized butterfly valve solutions for distributors, EPC contractors, and industrial equipment manufacturers. Possible customization options include:
It is a wafer butterfly valve in which the disc and shaft are connected by a pin. The pin locks the disc to the shaft so the quarter-turn shaft rotation is transmitted to the disc in centerline butterfly valve service.
The pin connects the disc hub to the shaft and transmits operating torque from the shaft to the disc. It maintains the rotational relationship between the disc and shaft during opening and closing.
Wafer butterfly valves are commonly used in large diameter water and industrial pipelines. The suitable size, pressure rating, and actuator configuration must be confirmed according to the project requirements.
Body options include DI, WCB, CF8, CF8M, and aluminum bronze. Disc options include plated ductile iron, CF8, CF8M, duplex, bronze, aluminum bronze, nylon coated, and PTFE lined.
Shaft options include SS420, SS316, 17-4PH, and duplex. Seat options include EPDM, NBR, high temperature EPDM, FKM, and PTFE. Final material selection depends on medium, temperature, pressure, and corrosion conditions.
Yes. Available actuation options include lever handle, gear operator, electric actuator, and pneumatic actuator. ISO 5211 mounting can be confirmed according to project requirements.
Typical applications include water treatment, water supply, wastewater, HVAC, industrial water, and large diameter pipeline systems.
Standard inspection may include shell pressure test, seat leakage test, dimensional inspection, visual inspection, and operating test. Laux Valve also provides OEM customization for body, disc, shaft, seat, actuator, coating, logo, nameplate, and packaging.
Contact LAUX Valve for technical drawings, material selection, pin connection confirmation, OEM manufacturing and customized butterfly valve solutions.
From raw material inspection to final delivery, every butterfly valve undergoes a comprehensive quality inspection to ensure reliable performance and compliance with international standards.
