Size: 1"-36" Class: 150#-1500#. Concentric Butterfly Valve Manufacturers of high performance butterfly valves

Size: 1"-36" Class: 150#-1500#. Concentric Butterfly Valve Manufacturers of high performance butterfly valves

Model NO. Concentric Butterfly Valve

Size: 1"-36" Class: 150#-1500#.
Manufacturers of butterfly valves
Bi-Directional Tight Shut-Off
Ends : Wafer Type, Lugged, Semi Lugged, Double Flanged
Design Standards
Designs to ANSI B16.34, API 609, BS5155
Face to face : API 609 / ISO 5752 short
Flange : UNI/DIN/ISO/ANSI
Testing to API 598

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Butterfly Valve Manufacturer

SJ concentric butterfly valves feature is a symmetrical disc design, ensuring favorable flow characteristics, and low pressure-drop. The concentric shaft ensures low operating torque. Concentric butterfly valves can be manufactured with sizes up to 1,800mm, with replaceable rubber seat, with various kind of materials. The oncentric butterfly valves shall be capable of bi-directional flow with bubble tight shut-off at full rating pressure. The unique seat design with retaining points, virtually eliminates any seat movement during open / close operation of the disc

Reference images for Concentric Wafer‑Type Butterfly Valve and Triple Eccentric Butterfly Valve Design

Comparison Dimension	Concentric Butterfly Valve (Wafer Type)	Triple Eccentric Butterfly Valve
Sealing Principle	Relies on the interference deformation of the resilient seat (rubber/PTFE, etc.) squeezing the disc to achieve sealing.	Relies on metal-to-metal (or composite) slanted-cone hard sealing, utilizing geometric eccentricity to achieve"zero-friction"closure.
Sealing Material	Soft seal (re(typically $-20^circtext{C} sim 120^circtext{C}$).silient rubber, EPDM, NBR, PTFE, etc.).	Hard seal (stainless steel, Stellite alloy, cemented carbide, etc.).
Leakage Class	Can achieve zero leakage (due to soft seal characteristics).	Can achieve zero leakage (under strict API 598 / ISO 5208 standards).
Friction & Wear	The sealing surfaces are constantly subjected to friction and squeezing during opening/closing, leading to faster wear and relatively shorter service life.	Sealing surfaces disengage instantly upon opening and only touch at the moment of closing, achieving"zero friction"throughout the entire stroke and an extremely long service life.
Temperature & Pressure Resistance	Generally lower pressure ratings (PN10/PN16/Class 150), temperature limited by rubber material (typically -20.℃～120℃）	High pressure resistance (up to Class 600/900 and above), extreme high and low temperature（ -196℃～+650℃）
Flow Resistance & Flow Capacity	Thicker disc, relatively higher flow resistance, and slightly lower flow capacity.	Streamlined disc design, lower flow resistance, and strong flow capacity (high Cv value).
Typical Application Scenarios	Water treatment, HVAC, sewage, low-pressure and ambient-temperature general industrial pipelines.	Petrochemical, refining, high-temperature and high-pressure steam in power plants, LNG (cryogenic), severe services.
Structural Complexity & Cost	Simple structure, compact size, lightweight, and low cost.	Complex structure, extremely high machining precision requirements, and high cost.

The disc of concentric wafer type lug butterfly valve is installed in the diameter direction of the pipeline.In cylindrical channel of the valve body,the disc rotates around the axis,and the rotation angle is between 0°-90° When it rotates to 90°,the valve is fully open.Valve is widely used,so the same valve will be have different collocation according to different occasions and working conditions.
Technical parameters
Medium/working condition /Main Parts	Can be used in water supply and drainage,central air conditioning,heating,sewage, chemical industry,paper making,Marine,food industry,etc


Seat	NBR	EPDM	VITON
Suitable temperature	-20℃~80℃	-20℃~100℃	-10℃~180℃

Main Parts and Materials:
NO	Part name			Material			NO		Part name			Material
1	Body			GGG40			4		Disc			CF8/C954/CF8M
2	Gland bush			SF-1			5		Seat			EPDM/NBR
3	Shaft			SS420			6		Gland bush			SF-1
Data size:
MM		A±3	B±3		φZ	H±1		KxK		F±1	Top Flange		ΦD	N-ΦG
DN50		115	74		12.6	32		9x9		43	F05		50	4-Φ8
DN65		132	82		12.6	32		9x9		46	F05		50	4-Φ8
DN80		135	92		12.6	32		9x9		46	F05		50	4-Φ8
DN100		162	108		15.77	32		11x11		52	F07		70	4-Φ10
DN125		176	123		18.92	32		14x14		56	F07		70	4-Φ10
DN150		190	135		18.92	32		14x14		56	F07		70	4-Φ10
DN200		230	166		22.10	45		17x17		60	F10		102	4-Φ12
DN250		270	200		28.45	45		19x19		68	F10		102	4-Φ12
DN300		305	238		31.60	45		22x22		78	F10		102	4-Φ12
DN350		340	270		31.60	45		22x22		78	F10		102	4-Φ12
DN400		400	310		33.15/37.95	52		27x27		102	F14		140	4-Φ18
DN450		420	330		38.00/42.86	52		27x27		114	F14		140	4-Φ18
DN500		465	367		41.15/45.70	64		36x36		127	F14		140	4-Φ18
DN600		536	430		50.65/53.98	70		36x36		154	F16		165	4-Φ22

The data is provided for reference purposes only. For detailed information, please contact our technical personnel.

FAQ1: What is the main difference between lug‑type and ordinary wafer‑type butterfly valve?

Answer: The lug‑type valve has threaded lugs on the valve body. Bolts screw directly into these lugs, allowing one‑side pipeline disassembly without removing the valve. Standard wafer‑type relies on long bolts running through both flanges; the valve will fall off if one‑side piping is removed.

FAQ2: Can this concentric wafer‑type lug butterfly valve work for water and seawater service?

Answer: Yes. Its concentric soft‑seat design is suitable for water service. For seawater, please advise us of working conditions so we can select suitable elastomer and metal material to resist corrosion.

FAQ3: What pressure classes are available for this lug butterfly valve?

Answer: We support ANSI Class 150 and PN10 / PN16 as regular options. Other pressure ratings can be customized upon your request.

FAQ4: Is this valve supplied with actuator?

Answer: This item refers to bare valve body only by default. Lever handle, gear operator, electric or pneumatic actuators are optional extras. Please specify your requirement in your inquiry.

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What exactly is the relationship between SANJING Valve Company and S J Valvole S.R.L.?

SJ Valvole S.R.L. is an Italian-registered entity holding multiple European OEM brand authorizations, utilizing shared local facilities for valve manufacturing, testing, and dispatch. SANJING Valve Co. operates as a wholly owned subsidiary of S J Valvole S.R.L., serving as its primary manufacturing hub with licensed processing rights under European brand authorizations.

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