Butterfly Valve
GM Dalui Butterfly Valves are designed to provide bubble-tight shut-off in a compact, lightweight design. Engineered for high performance, these valves feature low torque requirements, double eccentric or concentric discs, and excellent flow throttling capabilities for large-scale piping systems.
Introduction
A butterfly valve is a device used to regulate or isolate fluid flow. It features a circular disc that pivots to control the flow. When the disc is parallel to the flow, the valve is open; when perpendicular, it is closed.
Key Features
- Bi-directional bubble-tight shut-off capability.
- Concentric or double eccentric disc design to minimize seat wear and operating torque.
- Integrally molded or replaceable elastomeric/metal seats.
- Heavy-duty shafts with self-lubricating sleeve bearings.
- Easy integration with electric, pneumatic, or hydraulic actuators.
Technical Specifications
| Design Feature | Standard Parameters / Range Options |
|---|---|
| Nominal Size Range | Up to 3300 mm |
| Manufacturing Standards | API 609, IS 13095, BS 5155, AWWA C504, EN 593 |
| Material of Construction (MOC) |
|
| Pressure Ratings | 1.0 / 1.6 / 2.0 / 2.5 / Class 150# / 300# / 800# |
| Modes of Operation | Manual Lever, Gear Operated, Electric Actuated, Pneumatic Actuator |
| End Connections | Wafer / Lug / Double Flanged |
| Application Media | Water Supply, Water Treatment, Power Plants, Chemical & Process Industries, HVAC. |
Application & Usage of Butterfly Valve
Water Treatment Plants
Butterfly valves are crucial in water treatment processes, where they manage the flow of water through various stages of purification and distribution. Their compact design and quick response make them ideal for handling large volumes of water efficiently.
Chemical Processing
In chemical industries, butterfly valves are used to control the flow of corrosive or toxic chemicals. Their construction materials can be tailored to resist chemical corrosion, ensuring safe and reliable operation in harsh environments.
Oil & Gas Industry
Butterfly valves manage key process flows in gas transmission and oil refineries. Their fire-safe construction, tightness of sealing, and robust operation under pressure variations make them essential for petrochemical pipelines.
HVAC Systems
In heating, ventilation, and air conditioning (HVAC) systems, butterfly valves control the flow of air and water within ductwork and piping. They help maintain the desired temperature and airflow, contributing to energy efficiency and system reliability.
Fire Protection Systems
Butterfly valves are integrated into fire protection systems, where they act as shutoff valves to control the flow of water or fire suppressant. Their quick operation is vital in emergency situations, ensuring prompt fire suppression system activation.
Types Of Butterfly Valve - Connection Type
Double Flanged Type
A double flanged butterfly valve features flanges on both sides for secure, bolted connections. This design ensures robust sealing and alignment, making it ideal for high-pressure and high-temperature applications. It provides reliable flow control and easy maintenance.
Lug Type
A lug type butterfly valve includes threaded inserts for secure flange attachment, enabling simple installation and removal. It offers reliable flow control, with features such as bi-directional sealing and robust construction.
Wafer Type
A wafer type butterfly valve fits tightly between pipe flanges to maintain a seal against bi-directional pressure differentials. It is highly compact, lightweight, and economical for standard industrial pipelines.
Types Of Butterfly Valve - Disc Design
Concentric Type
A concentric butterfly valve features a disc mounted on a central shaft that rotates within a single-plane body. This design ensures a tight seal and efficient flow control, ideal for low to moderate pressure applications.
Resilient Seated Type
A resilient seated butterfly valve utilizes a flexible rubber seat to ensure a tight seal, making it ideal for low-pressure applications. Its design provides excellent sealing performance, ease of operation, and cost-effective maintenance.
Double Eccentric Type
A double eccentric butterfly valve has two offset features: 1. The shaft is off-centre. 2. The disc axis is offset from the seat. This design minimizes seat wear and improves sealing, making it suitable for higher pressure and temperature applications.
Triple Offset Type
A triple offset butterfly valve features a conical disc design with three key offsets: shaft, seat, and disc. This design enhances sealing and minimizes wear, making it suitable for high-pressure, high-temperature, and critical service applications.
Certificates & Inspection
All valves are subjected to rigorous hydrostatic shell and seat pressure testing in accordance with standard codes (e.g., API 598 / IS 14846) prior to delivery.
- Physical dimension and wall-thickness checks
- Hydrostatic seat and shell test validation
- Manufacturer Test Certificate (MTC) and third-party inspection (SGS, TUV, RINA, IRS etc.) available
- Epoxy powder coating inspection (DFT test)
Quality Assurance
GM Dalui & Sons Pvt. Ltd. is an ISO 9001:2015 certified manufacturer. Our commitment to safety, reliable sealing, and long service life is backed by rigorous material inspection, ultrasonic wall thickness checks, and design calculations.
We customize flow control systems to meet specific requirements for municipal waterworks, agricultural pumping wells, chemical distribution loops, and thermal power plant grids.