Butterfly Valve

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
Body style:    Wafer, FLug, Flange
Nominal diameter: 2″ – 80″ (DN50mm – DN2000mm)
Top flange: ISO5211

Butterfly valve refers to a kind of valve whose closure (disc or butterfly plate) is a disc and rotates around the valve axis to open and close. It is mainly used for cutting off and throttling in the pipeline. The opening and closing part of butterfly valve is a disc-shaped butterfly plate, which rotates around its own axis in the valve body to achieve the purpose of opening and closing or regulating. Butterfly valves are usually less than 90 degrees open to close. Butterfly valves and butterfly rods have no self-locking ability. In order to locate the butterfly plate, worm gear reducer should be installed on the valve stem. The use of worm gear reducer can not only make butterfly plate have self-locking ability, make butterfly plate stop at any position, but also improve the operation performance of the valve.

Industrial butterfly valves are characterized by high temperature resistance, high pressure range, large nominal diameter, carbon steel body and metal ring instead of rubber ring. Large high temperature butterfly valve is welded by steel plate, mainly used for flue gas duct and gas pipeline of high temperature medium.

Types of Butterfly Valves

Based on the type of ends of the body butterfly valves are available in following types.

• Both Flanged Ends
• Wafer Type Ends
• Lug Type Ends
• Butt Welded Types Ends

Wafer Butterfly Valve

Wafer concentric butterfly valve features a cartridge type seat, streamlined disc and strong stem-to-disc connection for easy use in many industrial applications such as food and beverage, pulp and paper, chemical, mining, water treatment, power plants, etc.

1: ISO5211 top flange together with stem square suitable for direct mounting of actuators
2: Stem anti-blowout design keep safety in field use
3: Dirtscraper prevents moisture penetrating into the shaft area
4:Multi-standard alignment holes suitable for various standard of flanges of EN1092 PN10, PN16, ASME B16.5              CLASS150, JIS B2239 10K, 16K, BS 10 Table D, Table E
5: Suitable for high pressure and full vacuum service due to the use of a cartridge seat design
6: No exposed pins or bolts for stem-to-disc connection
7: No need for flange gaskets
8: No risk of damage to the valve during installation in closed position
9: Bubble-tight shut of at full pressure rating
10: Large flow capacity and enough strength because of streamline disc design
11: Plug with O-ring sealing eliminates any leakage from the stem

NO.	Part name	Material
1	Body	ASTM A536 65-45-12, WCB, CF8M
2	Disc	ASTM A536 65-45-12 Nylon coated, CF8, CF8M, 2507, 1.4462
3	Seat	EPDM,NBR,FRM.PTFE
4	Stem	SS420,SS431
5	Lower Stem	SS420,SS431
6	Retalner	Nylon for DN50-DN300, SS304 for DN350-DN2000
7	Bearing	RPTFE with Graphite on I.D.
8	Weather seal	NBR
9	Nuts	Stainless steel
10	Plug	Steel galvanized for DN50-DN300, Cover plate for DN350-DN2000 material same as body with SS304 bolts
11	Screw	SS304

TECHNICAL DATA

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
Applications	Potable Water, Wastewater, Seawater, HVAC
Operation	Hand lever, gear box, pneumatic actuator, electric actuator

DIMENSIONS (mm)

SIZE		A	B	C	D	E	F	d	G	H	L	WT(kg)
DN	INCH
50	2″	126	78	13.5	94.3	9	50	8	70	31	43	2
65	2 1/2″	134	84	13.5	107.6	9	50	8	70	45	46	2.5
80	3″	138	92	13.5	123.9	9	50	8	70	64	46	3
100	4″	167	114	13.5	157	11	70	10	90	91	52	4.5
125	5″	180	129	17.5	181.5	14	70	10	90	110	56	6
150	6″	203	144	17.5	212	14	70	10	90	146	56	7
200	8″	228	179	24.5	267.4	17	102	12	125	193	60	12
250	10″	266	216	25	323.6	22	102	12	125	241	68	17
300	12″	291	247	25	377.4	22	102	12	125	292	78	25
350	14″	332	273	30	425	27	125	14	150	329	78	41
400	16″	363	317	30	484	27	125	14	150	376	102	58
450	18″	397	348	39	537	36	140	18	175	425	114	80
500	20″	425	393	39	589.5	36	140	18	175	475	127	97
600	24″	498	453	49	693.1	46	165	22	210	573	154	169
700	28″	626	531	90	928	63.1	254	18	300	674	165	252
750	30″	660	564	90	984	63.1	254	18	300	727	165	290
800	32″	666	601	90	1061	63.1	254	18	300	771	190	367
900	36″	722	660	110	1170	74.7	254	18	300	839	203	465
1000	40″	806	728	120	1290	83.7	298	22	350	939	216	606
1100	44″	826	771	140	1404	94.7	298	22	350	1036	255	805
1200	48″	941	874	150	1511	104.7	298	22	350	1137	276	900
1400	56″	1000	940	175	1685	139.9	356	32	415	1351	279	1158
1600	64″	1155	1085	195	1930	160	356	32	415	1548	318	1684
1800	72″	1200	1170	195	2170	174.5	406	39	475	1703	356	2645
2000	80″	1363	1360	245	2345	199	406	39	475	1938	406	4000

Lug Style Butterfly Valve

Llug concentric butterfly valve features a cartridge type seat, streamlined disc and strong stem-to-disc connection for easy use in many industrial applications such as food and beverage, pulp and paper, chemical, mining, water treatment, power plants, etc. Full rated unidirectional dead-end service is achieved by a lip designed in the lug body.

FEATURES
1,ISO5211 top flange together with stem square suitable for direct mounting of actuators
2,Stem anti-blowout design keep safety in field use
3,Dirtscraper prevents moisture penetrating into the shaft area
4,Suitable for high pressure and full vacuum service due to the use of a cartridge seat design
5,Full rated unidirectional dead-end service is achieved by a lip designed in the lug body
6,No exposed pins or bolts for stem-to-disc connection
7,No need for flange gaskets
8,No risk of damage to the valve during installation in closed position
9,Bubble-tight shut of at full pressure rating
10,Large flow capacity and enough strength because of streamline disc design
11,Plug with O-ring sealing eliminates any leakage from the stem

NO.	Part name	Material
1	Body	ASTM A536 65-45-12, WCB, CF8M
2	Disc	ASTM A536 65-45-12 Nylon coated, CF8, CF8M, 2507, 1.4462
3	Seat	EPDM, NBR, FPM
4	Stem	SS420, SS431
5	Lower Stem	SS420, SS431
6	Retainer	Nylon for DN50-DN300, SS304 for DN350-DN2000
7	Bearing	RPTFE with Graphite on I.D.
8	Weather seal	NBR
9	Weather seal	NBR
10	Plug	Steel galvanized for DN50-DN300, Cover plate for DN350-DN2000 material same as body with SS304 bolts
11	Screw	SS304

PARTS LIST AND MATERIAL SPECIFICATION

Body style	FLug
Nominal diameter	2″ – 80″ (DN50mm – DN2000mm)
Top flange	ISO5211
Operating pressure	16bar for DN50-DN300, 10bar for DN350-DN2200
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
Applications	Potable Water, Wastewater, Seawater, HVAC
Operation	Hand lever, gear box, pneumatic actuator, electric actuator

SIZE		A	B	C	D	E	F	d	G	H	J	L	WT(kg)
DN	INCH
50	2″	126	78	13.5	117	9	50	8	70	31	34	43	2.8
65	2 1/2″	134	84	13.5	131	9	50	8	70	45	36	46	3.7
80	3″	138	92	13.5	176	9	50	8	70	64	36	46	5.1
100	4″	167	114	13.5	206	11	70	10	90	91	40	52	6.9
125	5″	180	129	17.5	236	14	70	10	90	110	44	56	9.3
150	6″	203	144	17.5	258	14	70	10	90	146	44	56	10.5
200	8″	228	179	24.5	321	17	102	12	125	193	50	60	17.4
250	10″	266	216	25	395	22	102	12	125	241	57	68	28.1
300	12″	291	247	25	461	22	102	12	125	292	66	78	40
350	14″	332	273	30	511	27	125	14	150	329	62	78	55
400	16″	363	317	30	580	27	125	14	150	376	84	102	85
450	18″	397	348	39	630	36	140	18	175	425	94	114	114
500	20″	425	393	39	700	36	140	18	175	475	110	127	144
600	24″	498	453	49	823	46	165	22	210	573	120	154	227
700	28″	626	531	90	928	63.1	254	18	300	674	54	165	342
750	30″	660	564	90	984	63.1	254	18	300	727	54	165	400
800	32″	666	601	90	1061	63.1	254	18	300	771	60	190	485
900	36″	722	660	110	1170	74.7	254	18	300	839	60	203	605
1000	40″	806	728	120	1290	83.7	298	22	350	939	60	216	776
1100	44″	826	771	140	1404	94.7	298	22	350	1036	50	255	985
1200	48″	941	874	150	1511	104.7	298	22	350	1137	62	276	1190
1400	56″	1000	940	175	1685	139.9	356	32	415	1351	62	279	1380
1600	64″	1155	1085	195	1930	160	356	32	415	1548	65	318	2054
1800	72″	1200	1170	195	2170	174.5	406	39	475	1703	70	356	3075
2000	80″	1363	1360	245	2345	199	406	39	475	1938	75	406	4500

Flanged Butterfly Valve

Llug concentric butterfly valve features a cartridge type seat, streamlined disc and strong stem-to-disc connection for easy use in many industrial applications such as food and beverage, pulp and paper, chemical, mining, water treatment, power plants, etc. Full rated unidirectional dead-end service is achieved by a lip designed in the lug body.

FEATURES
1,ISO5211 top flange together with stem square suitable for direct mounting of actuators
2,Stem anti-blowout design keep safety in field use
3,Dirtscraper prevents moisture penetrating into the shaft area
4,Suitable for high pressure and full vacuum service due to the use of a cartridge seat design
5,Full rated unidirectional dead-end service is achieved by a lip designed in the lug body
6,No exposed pins or bolts for stem-to-disc connection
7,No need for flange gaskets
8,No risk of damage to the valve during installation in closed position
9,Bubble-tight shut of at full pressure rating
10,Large flow capacity and enough strength because of streamline disc design
11,Plug with O-ring sealing eliminates any leakage from the stem

NO.	Part name	Material
1	Body	ASTM A536 65-45-12, WCB, CF8M
2	Disc	ASTM A536 65-45-12 Nylon coated, CF8, CF8M, 2507, 1.4462
3	Seat	EPDM, NBR, FPM
4	Stem	SS420, SS431
5	Lower Stem	SS420, SS431
6	Retainer	Nylon for DN50-DN300, SS304 for DN350-DN2000
7	Bearing	RPTFE with Graphite on I.D.
8	Weather seal	NBR
9	Weather seal	NBR
10	Plug	Steel galvanized for DN50-DN300, Cover plate for DN350-DN2000 material same as body with SS304 bolts
11	Screw	SS304

PARTS LIST AND MATERIAL SPECIFICATION

Body style	FLug
Nominal diameter	2″ – 80″ (DN50mm – DN2000mm)
Top flange	ISO5211
Operating pressure	16bar for DN50-DN300, 10bar for DN350-DN2200
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
Applications	Potable Water, Wastewater, Seawater, HVAC
Operation	Hand lever, gear box, pneumatic actuator, electric actuator

SIZE		A	B	C	D	E	F	d	G	H	J	L	WT(kg)
DN	INCH
50	2″	126	78	13.5	117	9	50	8	70	31	34	43	2.8
65	2 1/2″	134	84	13.5	131	9	50	8	70	45	36	46	3.7
80	3″	138	92	13.5	176	9	50	8	70	64	36	46	5.1
100	4″	167	114	13.5	206	11	70	10	90	91	40	52	6.9
125	5″	180	129	17.5	236	14	70	10	90	110	44	56	9.3
150	6″	203	144	17.5	258	14	70	10	90	146	44	56	10.5
200	8″	228	179	24.5	321	17	102	12	125	193	50	60	17.4
250	10″	266	216	25	395	22	102	12	125	241	57	68	28.1
300	12″	291	247	25	461	22	102	12	125	292	66	78	40
350	14″	332	273	30	511	27	125	14	150	329	62	78	55
400	16″	363	317	30	580	27	125	14	150	376	84	102	85
450	18″	397	348	39	630	36	140	18	175	425	94	114	114
500	20″	425	393	39	700	36	140	18	175	475	110	127	144
600	24″	498	453	49	823	46	165	22	210	573	120	154	227
700	28″	626	531	90	928	63.1	254	18	300	674	54	165	342
750	30″	660	564	90	984	63.1	254	18	300	727	54	165	400
800	32″	666	601	90	1061	63.1	254	18	300	771	60	190	485
900	36″	722	660	110	1170	74.7	254	18	300	839	60	203	605
1000	40″	806	728	120	1290	83.7	298	22	350	939	60	216	776
1100	44″	826	771	140	1404	94.7	298	22	350	1036	50	255	985
1200	48″	941	874	150	1511	104.7	298	22	350	1137	62	276	1190
1400	56″	1000	940	175	1685	139.9	356	32	415	1351	62	279	1380
1600	64″	1155	1085	195	1930	160	356	32	415	1548	65	318	2054
1800	72″	1200	1170	195	2170	174.5	406	39	475	1703	70	356	3075
2000	80″	1363	1360	245	2345	199	406	39	475	1938	75	406	4500

Butt Welded Ends Types

This types of ends are used in high-pressure services and it directly welded to the pipe.

Seat Types

Butterfly valves can be metal-to-metal seated, soft seated, or with a fully lined body and disc. The first image is of soft seated fully lined body and disc valve. Second, is a soft seat with metal disk and the third is metal to metal seat type valve.

The disk of butterfly valve can be concentric or eccentric with the valve body. Here I have shown three different arrangements of the disk with respect to a center of the valve body.

Zero offset Butterfly Valve

Zero offset design used for the valve that used in low-pressure and temperature services. In this design, the disc and shaft axis is concentric with the valve body. In the open position, the disc divides the flow into two equal halves, with the disc in the middle and parallel to the flow.

This type of valve has a resilient seat. Sealing is achieved when the disc deforms the soft seat. There is friction between the disk and seat during the full operating cycle which is the disadvantage of zero offset valve.

Double Offset Butterfly Valve

In Double Offset, the disk is offset from the valve center line and also from valve body center line. You can see this in the image where one and two are written. This creates a cam action during operation that lifts the seat out of the seal.

Double offset makes opening and closing smooth as friction is applicable only during the first few degrees of opening and final few degrees of closing, approx 10 degrees of opening and closing.

Triple Offset Butterfly Valve

In Triple Offset design the third offset created by the geometry design of the seating surface. The seat is machined into an offset conical profile resulting in a right-angled cone. You can see this in the third image with small enlargement of seating angle.

This ensures frictionless stroking throughout its operating cycle. Contact is only made at the final point of closure with the 90° angle acting as a mechanical stop; Metal seated valve use triple offset design.

Butterfly Valve Applications

• A Butterfly valve is used in many different fluid services and they perform well in slurry applications also. They can be used in liquids, steam, cryogenics, cooling water, air, gasses, firefighting & Vacuum services.
• Butterfly Valve is used in all type of industries application even in High-pressure and temperature services.

Butterfly Valve Advantages

• Butterfly Valve is suitable for large valve applications due to Compact, lightweight design that requires considerably less space, as compared to other valves
• Due to a quick operation, it needs less time to open or close
• The maintenance costs are usually low compared to other valve types
• A pressure drop across a butterfly valve is small
• Valve with Non-metallic seating can be used in chemical or corrosive media.

Butterfly Valve Disadvantages

• Throttling is limited to low differential pressure services and that too with a 30- to 80-degree disc opening.
• There is a chance for cavitation and choke as the disk is always in the flow Turbulence flow can affect the disc movement.

Source: hardhatengineer.com