Description

Electric Butterfly Valve

Electric Butterfly Valve: Overview, Benefits, and Applications

An electric actuated butterfly valve is a type of flow control device that is widely used in various industries for controlling and regulating the flow of fluids through pipelines. The actuated butterfly valve stands apart from manual valves and other industrial valves because of its unique design, efficient operation, and electric actuator.

How Electric Butterfly Valves Work

Motorized butterfly valve work by utilizing an electric actuator to open, close or modulate the position of a disc-shaped element within the valve. This disc, known as the butterfly, is positioned in the center of the pipe, and it rotates to either restrict or permit flow through the valve. The orientation of the butterfly can be adjusted precisely with the help of an electric actuator.

Electric Actuator

The electric actuator is the heart of the electric butterfly valve, responsible for driving the movement of the butterfly disc. It uses an electric motor to convert electrical energy into mechanical motion, which then rotates the valve stem, adjusting the position of the butterfly disc. When the actuator receives an input signal such as 4-20mA, 0-10V or 1-5V, it interprets this signal to determine the target position of the butterfly and adjusts the disc accordingly.

Design and Components

The main components of an electric butterfly valves include the body, disc, seat, stem, and electric actuator. The body of the valve is typically constructed from materials like ASTM A536 65-45-12, WCB, or CF8M, while the disc can be made from materials such as ASTM A536 65-45-12 with a Nylon coating, CF8, CF8M, 2507, or 1.4462. The seat can be comprised of EPDM, NBR, FRM, or PTFE and the valve stem is typically made from SS420 or SS431.

The body style of the electric butterfly valve is generally wafer-type, which allows for easy installation and replacement. The top flange of the valve is designed according to ISO5211 standards, and it can accommodate various flange types such as EN 1092 PN 6/PN10/PN16, ASME Class 150, AS 4087 PN10/PN16, and JIS 5K/10K.

Benefits and Limitations

Benefits of Electric Butterfly Valves

1. Precise control: The electric actuator allows for precise control of the valve’s operation, ensuring accurate regulation of fluid flow.
2. Remote operation: Electric butterfly valves can be controlled remotely, reducing the need for manual intervention and increasing safety in hazardous environments.
3. Energy-efficient: Electric actuators consume less energy than pneumatic or hydraulic actuators, making electric butterfly valves an energy-efficient option.
4. Simple maintenance: Electric actuation components are compact, making maintenance and troubleshooting more straightforward.

Technical parameters

Body	ASTM A536 65-45-12, WCB, CF8M
Disc	ASTM A536 65-45-12 Nylon coated, CF8, CF8M, 2507, 1.4462
Seat	EPDM,NBR,FRM.PTFE
Stem	SS420,SS431
Body style	wafer
Nominal diameter	2″ – 80″ (DN50mm – DN2000mm)
Top flange	ISO5211
Operating pressure:	16bar for DN50-DN300, 10bar for DN350-DN2000
Temperature range:	-20 °C to + 140 °C (depending on pressure, medium and material)
Flange accommodation	EN 1092 PN 6/PN10/PN16 ASME Class 150 AS 4087 PN10/ PN16 JIS 5K/10K

Electric actuator

On-off type: feedback signal: Passive contact signal/4-20mA/ resistance signals.
Regulation type: Input signal 4-20mA/0-10V/1-5V；
Feedback signal: 4-20mA/0-10V/1-5V
Voltage: AC220V\380V\110V\24V、DC12V\24V etc；Special voltage can be customized.
Explosion-proof class: Can be choose explosion-proof type EX d IIBT4

Type	Control type	Function
Electric actuator	ON-OFF type	Feedback: the active signal, passive contact signal, resistance, 4-20mA
	Regulation type	Input and output signal: 4-20mA, 0-10v, 1-5v, switch, MODBUS, PROFIBUS field bus
	Filed operation	The field, remote control switch regulation and MODBUS, PROFIBUS field bus

Outline size drawing: 

DN	A	H	H1	d	D	n-d	L
50	157	340	80	52.6	125	4-16	42
65	157	354	89	64.4	145	4-16	45
80	157	360	95	78.9	160	8-16	45
100	208	410	114	104.1	180	8-16	52
125	208	423	127	123.4	210	8-16	55
150	208	435	139	155.9	240	8-20	55
200	256	485	175	202.8	295	8-20/12-20	60
250	256	518	203	250.8	350/355	12-20/12-24	66
300	256	562	242	301.9	400/410	12-20/12-24	76
350	280	622	267	334	460/470	16-20/16-24	76
400	280	644	301	390	515/525	16-24/16-27	86
450	280	686	381	441	565/585	20-24/20-27	105
500			387	492	620/650	20-24/20-30	130
600			457	593	725/770	20-27/20-33	151

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