Full Rubber Lined Disc Butterfly Valve, Lug Type, Worm Gear

Rubber-lined centreline butterfly valves represent a versatile valve type characterised by simple construction, reliable sealing, low cost, and convenient operation. Butterfly valves are most suitable for shutting off non-corrosive liquid media (particularly water) at ambient temperatures, low pressures, and large diameters.

The defining characteristic of the rubber-lined disc butterfly valve lies in its disc (butterfly plate) surface being lined with elastic materials such as rubber, whilst the valve stem axis is positioned at the intersection of the butterfly plate centreline and the valve passage centreline (i.e., a ‘coaxial’ structure).

The rubber lining (commonly nitrile rubber NBR, ethylene propylene diene monomer rubber EPDM, fluorocarbon rubber FKM, etc.) isolates the metal valve disc from the medium, making it suitable for handling various corrosive media such as potable water, seawater, weak acids, and weak alkalis.

Compared to gate valves, globe valves and the like, butterfly valves feature a simpler structure, compact size, lighter weight, reduced installation space requirements, and ease of maintenance.

Pressure and temperature limitations: Due to the inherent properties of the rubber lining material, these fittings are generally suitable for medium to low pressure applications (commonly PN10/16/25) and ambient temperature conditions (depending on the rubber type, typically ranging from -20°C to below 120°C).

Series: KF-LT

Type: Concentric Resilient Seated

Size: DN50-500mm, NPS 2”-20”

Design Standard: EN 593, API 609

Pressure Rating: Up to 10 Bar

Certificate: ISO9001, CE, WRAS, ACS

Sample: Available

Service: OEM & ODM

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Features

Specifications

Dimension

Features

Operation Cycles	Over 100,000 times
Leakage Level	Bubbles-tight sealing with no leakage
Low Torque	Operation easy and flexible
Bidirectional Sealing	Any installation position
Lower Cost	Simple and compact structure with high cost-effectiveness
Low Flow Resistance	Improve fluid efficiency and reduce energy consumption
Application	Seawater, Saline Water
Certificates	ISO9001, CE, WRAS, ACS

Specifications

Design Standard	API 609, EN 593
Top Flange Standard	ISO 5211
End Flange Standard	PN10/PN16, ANSI 125LB/150LB, JIS 5K/10K
Face to Face Dimension	API 609, EN558-1 Series 20, BS5155, DIN3202 K1
Testing Standard	API 598, EN12266
Temperature	0℃~100℃(depends on the sealing material)
Body Material	Ductile Iron, Carbon Steel, Stainless Steel
Disc Material	DI+EPDM/NBR/NR, SS+EPDM/NBR/NR...
Shaft Material	Stainless Steel, Inconel
Seat Material	NBR, EPDM, VITON, Silicone
Operator	Worm Gearbox

Dimension

Size	L	□T	ANSI 150LB		JIS 5K		JIS 10K		Top Flange
Size	L	□T	Ф D	n - UNC	Ф D	n - M	Ф D	n - M	Top Flange
DN50	43	9*9	120.6	4-5/8	105	4-M12	120	4-M16	F05
DN65	46	9*9	139.7	4-5/8	130	4-M12	140	4-M16	F05
DN80	46	9*9	152.4	4-5/8	145	4-M16	150	4-M16	F05
DN100	52	11*11	190.5	8-5/8	165	4-M16	175	4-M16	F07
DN125	56	14*14	215.9	8-3/4	200	4-M16	210	4-M20	F07
DN150	56	14*14	241.3	8-3/4	230	4-M16	240	4-M20	F07
DN200	60	17*17	298.4	8-3/4	280	4-M20	290	4-M20	F10
DN250	68	19*19	361.9	12-7/8	345	4-M20	355	4-M22	F10
DN300	78	22*22	431.8	12-7/8	390	4-M20	400	4-M22	F10
DN350	78	22*22	476.2	12-1	435	4-M22	445	4-M22	F10
DN400	102	27*27	539.7	16-1	495	4-M22	510	4-M24	F14
DN450	114	27*27	577.8	16-1 1/8	555	4-M22	565	4-M24	F14
DN500	127	36*36	635	20-1 1/8	605	4-M22	620	4-M24	F14