KRAVEN Butterfly valve Item 875-876-877

Categoria Válvulas borboleta de ferro fundido KRAVEN

Ductil iron butterfly valve for mounting between flanges, “wafer” type

ITEM 875
Body: ductil iron
Disc: ductil iron
Liner: see table

ITEM 876
Body: ductil iron
Disc: CF8M (316 S.S.)
Liner: see table

ITEM 877
Body: ductil iron
Disc: Bronze aluminium
Liner: see table

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KRAVEN Butterfly valve Item 875-876-877 - benefícios -

1. EN ISO 5211 top mounting
Easy coupling with every kind of drives.

2. Four guiding bushings on the shaft
It grants a perfect alignment of the shaft on the body and prevents oscillations even with high pressure.
Less friction between the shaft and body.

3. Vulcanized liner on rigid ring
Less deformation of the liner.
Easy assembly / disassembly of the liner for maintenance.
No deformation of the liner between the flanges during assembly.
Greater dimensional accuracy during the injection/molding.

4. Shaft 1 piece without fixing components
Easy assembly / disassembly of the disc for maintenance.

5. Lapped surface of the disc's circumference
Better tightness and less wear of the liner.
Lower torque due to less friction between the disc and liner.

Wide range of LINER materials
Various applications possibility.

PED Certificate
Full compliance with European Safety Standards for Pressure Equipment.

ATEX Certificate
Installation is allowed in a potential explosive environment.

GENERAL FEATURES
OMAL butterfly valves, available in wafer or lug version from DN40 to DN300, are designed and manufactured to be used in most applications in all industrial fields:
• General requirements in accordance with UNI EN593.
• Face to face as per EN 558 series 20.
• Tightness at 16 bar according to EN 12266-1 rate A.
• Integral sealing (with liner vulcanized on hard ring) which avoids any contact between fluid and valve body.
• Sealing design allowing perfect adherence to the valve body and perfect tightness to the flanges, without additional parts. Clamping between flanges does not influence the torque of the valve.
• Lapped disc edges that allows better tightness, reduced torque and low wear of the liner.
• Bushes to support the shaft.
• Coupling between stem and disc with splined connection to reduce clearance
• Valve neck with top work as per EN ISO 5211 for easy connections with all different types of actuators.
• All components properly treated against corrosion.

OMAL will be free to change all specifications and data included in this catalogue at any time, so as to improve the quality and the performance of its products.

STANDARD EXECUTIONS:
• Standard flanges: PN 6, PN 10 - PN 16 - ANSI 150;
• General requirements in accordance with UNI EN593.
• Face to face as per EN 558 serie 20.
• Valve head as per ISO 5211.
• Tightness as per EN 12266-1 rate A .
• Operating Temperature of liners:
EPDM: from -20°C to +120°C;
NBR: from -20°C to +80°C;
FKM: from -12°C to +180°C;
• Maximum working pressure 16 bar (also ANSI 150);
• For vacuum applications;
• EPDM for potable water from -20°C to +120°C;
• EPDM white from -20°C to +120°C;

ON REQUEST:
• Polished CF8M disc (Ra max 0.4);
• Bronze aluminium and FKM disc;

CERTIFICATIONS:
• According to 2014/68/EU “PED”.
• Conformity to the italian D.M.n°174 suitable with drinking water and alimentary fluid (V876).
• ATEX version in conformity with European Directive 2014/34/EU.
• ATEX certificate on request.

KRAVEN Butterfly valve Item 875-876-877 - dimensões -

DIMENSIONS
SIZE		A	B	ØC	ØD	ØE	ØF	□G	H	I	L	P	FLANGING
DN [mm]	[inch]	A	B	ØC	ØD	ØE	ØF	□G	H	I	L	P	PN6	ØM	PN10	ØM	PN16	ØM	ANSI 150	ØM
DN 40	1"1/2	32	35	50	8	65	12,1	9	55	133	9	29	100	18	110	18	110	18	98	16
DN 50	2"	42	46,1	50	8	65	12,1	9	57	143	9	32	110	18	125	18	125	18	121	19
DN 65	2"1/2	45	49,1	50	8	65	14,1	11	68	152	11	46,5	130	18	145	18	145	18	140	16
DN 80	3"	45	48,4	50	8	65	14,1	11	82	160	11	65	150	18	160	18	160	18	152	19
DN 100	4"	51	55,3	70	10	90	14,1	11	100	181	11	91	170	18	180	18	180	18	191	19
DN 125	5"	55	58,8	70	10	90	18,1	14	112	194	14	111	200	18	210	18	210	18	216	22
DN 150	6"	55	59,1	70	10	90	18,1	14	126	202	14	146	225	22	240	22	240	22	241	26
DN 200	8"	59	64,1	102	12	125	22,1	17	162	240	17	195	280	22	295	22	295	22	298	22
DN 250	10"	67	71,8	102	12	125	28,2	22	193	272	22	242	335	22	350	22	355	26	362	25
DN 300	12"	77	81	103	12	125	28,2	22	238	320	22	293	395	22	400	22	410	26	432	25

KRAVEN Butterfly valve Item 875-876-877 - materiais -

MATERIALS
1	Body	EN GJS 400-18 LT
2	Disc	A351 CF8M (316 S.S.), EN GJS 450-10
3	Upper shaft	A276 S42000 (420 S.S.)
4*	Liner	EPDM-NBR-FKM
5*	Bush	Epoxy resin
6*	Shaft seal	EPDM-NBR-FKM
7	Spring antistatic device	Stainless steel
8	Anti blow-out system	Carbon steel
9	Screws	Stainless steel

* Components of spare part kit KGK...
If other valve materials are required, please contact our offices.

MATERIAL APPLICATIONS
MATERIAL	FEATURES	APPLICATIONS
DUCTIL IRON EN GJS 400-18 LT	Mechanical strength as good as stainless steel. Operating temperature (°C): -20°/+200°.	General applications. Used as a standard for body and disc.
STAINLESS STEEL A351-CF8M	Excellent corrosion resistance.	Food, chemical, pharmaceutical...etc
EPDM, EPDM WHITE	Operating temperature (°C): -20°/+120°. Unsuitable for hydrocarbons.	Water (soft, sea, glycolic and industrial), steam, ozone, bases and diluted acids, acetic solvents, alcohol, caustic soda, atmospheric agents.
NBR	Good abrasion/wear resistance. Good chemical and mechanical srenght to mineral oils, some hydrocarbons and aliphatic solvents. Operating temperature (°C): -20° / + 80°. Unsuitable for acetone, ketones, nitrates and chlorinated hydrocarbons.	General applications, compressed air, cold water, hydraulic fluids, methane, butane, petroleum, sea water, abrasive materials for pneumatic circuits, animal and vegetables fats.
FKM	Excellent chemical and mechanical strenght to heat, atmospheric agents, benzoic solvents. Gas-proof. Unsuitable for steam and boiling water. Operating temperature (°C): -12° / +180°.	Solvents (acetic excluded), solid hydrocarbons, oxygenating fuels, acids, bases, hydraulic fluids, oils.
EPDM FOR POTABLE WATER	Suitable for potable water accordingly to italian law D.L. 174/2004. Operating temperature (°C): -20 / + 120. Unsuitable for hydrocarbons.	Water (soft, sea, glycolic and industrial), steam, ozone, bases and diluted acids, acetic solvents, alcohol, caustic soda, atmospheric agents.

NOTE: The table above lists typical features and applications of all “OMAL” products. Nevertheless, if unusual situations occur (i.e. special applications, contacts with particular fluids, extraordinary pressure or temperature conditions, ...) the elements which determine corrosion and abrasion might change and, as a consequence, metal performances might change, too. It is always the customer who has to choose the right material; however, our sales department is willing to meet all customers requests.

PRESSURE LOSS-FLOW DIAGRAM

Example of flow-pressure and pressure drop in a 6” (DN. 150) valve with a water flow of 0,1 m3/sec. and a rotation angle of 90°:
1) Determine the point where the valve flow and diameter lines meet
2) Draw a vertical line from the above-mentioned point to the 90° straight line; then draw a horizontal line from this point to the flow-pressure loss scale, where you’ll read the requested value (0,038 bar).
3) Starting from point 1 and going down the fluid speed scale, you’ll read the fluid speed values (5 m/sec.)

KRAVEN Butterfly valve Item 875-876-877 - diagramas e torques de partida -

BREAKAWAY TORQUES Nm
Size	DN 40 1"1/2	DN 50 2"	DN 65 2"1/2	DN 80 3"	DN 100 4"	DN 125 5"	DN 150 6"	DN 200 8"	DN 250 10"	DN 300 12"
PN 10 bar								130	180	270
PN 16 bar	9	10	17	24	42	60	90	180	245	365

Torque can vary depending on temperature and type of fluid; a safety factor of 1.3 must be applied. Torque can drop on high frequency of operations. The actuator/ valve sizing, indicated on the following pages, are based for valves to be used with liquids or gaseous fluids, clean, and for medium temperatures. For further information, or different uses please contact our sales department.