Description
A grooved type butterfly valve is a quarter-turn valve featuring a disc-shaped closure element (butterfly) positioned perpendicular to the flow path. Instead of traditional flanges or lugs, it utilizes pre-formed grooves on its body ends for secure and effortless connection with grooved couplings.
Key components:
- Body: Houses the internal mechanism and provides connections to the piping system. Typically made of ductile iron or cast iron for durability and pressure resistance.
- Disc (Butterfly): Rotates within the body to regulate flow. Materials vary depending on the application, like EPDM rubber for water systems or metal for harsher fluids.
- Shaft: Connects the disc to the actuator for rotation control. Can be manual (lever handle) or automated (gearbox or pneumatic actuator).
- Seat: Seals against the disc to prevent leakage, usually made of resilient materials like EPDM or PTFE.
- Grooves: Annular channels machined on the body ends for attachment to grooved couplings.
Working principle:
The grooved butterfly valve uses a circular disc (or vane) to regulate flow through the valve. The disc is located in the center of the valve body and is connected to a valve stem, which passes through the valve neck.
To open the valve, the disc is rotated 90 degrees until the vane is parallel to the direction of flow, presenting minimal resistance to flow. To close the valve, the disc is rotated 90 degrees perpendicular to the flow, blocking the pipe cross section.
The valve disc has a resilient liner material (such as EPDM or NBR) that provides a tight seal when the valve is closed. The upstream pressure forces the disc liner against the body seat to achieve zero leakage.
Rotation of the disc is controlled by the valve actuator, which connects to the stem. This may be a manual handwheel, pneumatic actuator, electric actuator, or automated control system. The actuator rotates the stem to precisely position the disc for the desired flow control.
The grooved ends allow the valve to be easily installed between flanges with grooved end fittings. This provides a fast, convenient installation compared to flanged or threaded end valves. The grooved connection also allows flexibility for valve maintenance and replacement.
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Grooved Type Butterfly Valve
Grooved Type Butterfly Valve specification
| Specification | Details |
|---|---|
| Valve Type | Grooved End Butterfly Valve |
| Body Material | Ductile Iron, Stainless Steel 316 |
| End Connection | Grooved per ASME/ANSI B16.21 |
| Sizes Available | 2” to 24” |
| Pressure Rating | 150 psi, 300 psi |
| Temperature Range | -20°F to 250°F |
| Body Design | Wafer |
| Disc | Offset V-Type |
| Seat | EPDM, NBR |
| Stem | One or Two-Piece Stainless Steel |
| Operator | Lever, Gear, Pneumatic, Electric |
| Compliance | MSS SP-67, API 609 |
| Testing | 100% Factory Tested |
| Options | Limit Switch, Position Indicator |
Grooved Type Butterfly Valve Features:
• Ease of installation: Grooved butterfly valves are much easier to install than traditional flanged or wafer-type butterfly valves. This is because they do not require welding or bolting, and they can be simply clamped onto the pipe with grooved couplings. This can save time and labor costs during installation.
• Leak-proof sealing: The grooved couplings used with grooved butterfly valves create a very tight seal, which helps to prevent leaks. This is important for applications where leaks could be a safety hazard or cause damage to property.
• Vibration resistance: Grooved butterfly valves are more resistant to vibration than flanged or wafer-type valves. This is because the grooved couplings help to absorb vibration and prevent it from being transmitted to the valve body. This can be important for applications where the valves are subjected to a lot of vibration, such as in power plants or industrial facilities.
• Wide range of applications: Grooved butterfly valves can be used in a wide range of applications, including water, wastewater, irrigation, HVAC, and fire protection systems. They are also a good choice for applications where space is limited, as they are more compact than other types of butterfly valves.
• Cost-effective: Grooved butterfly valves are typically less expensive than flanged or wafer-type valves. This is because they are simpler to manufacture and install.
Grooved Type Butterfly Valve Advantages:
1. Effortless Installation:
• Image of Grooved butterfly valve installation
• No welding or bolting required, unlike flanged valves.
• Simply clamp onto pipes with grooved couplings, saving time and labor.
• Ideal for confined spaces with limited access.
2. Leakproof Seal:
• Image of Grooved butterfly valve couplings
• Grooved couplings create a tight, secure seal, preventing leaks.
• Crucial for safety-sensitive applications and protecting property.
3. Vibration Resistance:
• Image of Grooved butterfly valve on vibrating machinery
• Grooved couplings absorb vibration, preventing it from reaching the valve body.
• Suitable for applications with high vibration levels, like power plants or factories.
4. Versatile Applications:
• Image of Grooved butterfly valve in water system
• Applicable in various sectors, including water, wastewater, irrigation, HVAC, and fire protection.
• Compact design makes them ideal for space-constrained installations.
5. Cost-Effective:
• Image of Grooved butterfly valve compared to flanged valve
• Generally cheaper than flanged or wafer-type valves due to simpler manufacturing and installation.