* - AVK International

Fixed NBR liner, stainless steel disc, DN50-300

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Michael Nielsen

Product Manager, fire protection & water supply

Centric butterfly valve with fixed liner - semi lug - stainless steel disc for fire protection application

AVK centric butterfly valves with fixed liner feature an outstanding seating concept. The rubber is injection moulded directly on the valve body forming a permanent bond. Consequently, there is no risk of deformation or dislocation of the liner making the valves suitable under vacuum conditions. The combination of the profiled disc edge and the excellent AVK rubber quality ensures maximum durability of the liner.

Variant 75/31-023
Connection:	Flanged
Material:	Ductile Iron
DN:	DN50 - DN300
PN:	PN10/16

Features

Bonded vulcanized liner of NBR with an excellent compression set and thus ability to regain its original shape.
Streamlined disc with minimum flow resistance.
Profiled disc edge requires minimal deformation of the liner to achieve tight sealing, and results in less wear of the liner.
Shaft and disc of stainless steel AISI 431.
Shaft bearings of PTFE coated steel.
Top shaft sealing consisting of a bronze bushing with two EPDM O-rings.
Bottom shaft sealing consisting of a plug of galvanized steel with a copper sealing ring.
Low torques as a result of the profiled disc edge and fixed liner design.
Ductile iron body with PUR coating red RAL 3000.

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Datasheet

Appendix

Tender Text

Certificate(s)

Installation, Operation & Maintenance

Animation

AVK_centric_butterfly_valve_fixedliner_animation.mp4

Outline drawings

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AVK ref. no.	DN mm	Product PN Class	L mm	H1 mm	H2 mm	F2 mm	L5 mm	Actuator Flange	Theoretical weight/kg
75-0050-30-214202600204	50	PN16	43	118	63	34	12	90	2.8
75-0065-30-214202600204	65	PN16	46	126	71	34	12	90	3.6
75-0080-30-214202600204	80	PN16	46	133	78	34	12	90	3.9
75-0100-30-214202600204	100	PN16	52	147	98	34	12	90	5.1
75-0125-30-214202600204	125	PN16	56	160	109	34	12	90	7.0
75-0150-30-214202600204	150	PN16	56	180	133	34	14	90	9.5
75-0200-30-214202600204	200	PN16	60	204	158	34	14	90	14
75-0250-30-214201300204	250	PN10	68	245	194	45	15	125	24
75-0250-30-214202600204	250	PN16	68	245	194	45	15	125	24
75-0300-30-214201300204	300	PN10	78	270	219	45	15	125	36
75-0300-30-214202600204	300	PN16	78	270	219	45	15	125	36

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Components

1.	Shaft	Stainless steel 431
2.	Bushing	Bronze
3.	O-ring	NBR rubber
4.	Body	Ductile iron GJS-400-15 (GGG-40)
5.	Bearing	Steel, PTFE coated
6.	Conical pin	Stainless steel 431
7.	Disc	Stainless steel 431
8.	Shaft	Stainless steel 431
9.	Liner	NBR rubber
10.	Bearing	Steel, PTFE coated
11.	Seal ring	Copper
12.	Plug	Steel, galvanized