What types of valves does KR Valve manufacture?

KR Valve manufactures more than 500 valve products, including wafer, lug, concentric and double eccentric butterfly valves, resilient seat, metal seat and knife gate valves, dual disc, swing, lift and ball type check valves, ball valves, hydraulic water control valves such as 200X pressure reducing valves and 100X remote float valves, and Y type strainers.

Which international standards do KR valves follow?

Our range covers common international standards such as DIN F5 face-to-face gate valves, BS5163 resilient seat gate valves, BS5153 dual disc check valves, ANSI flanged strainers and PN16 pressure rated water control valves. Non-standard designs can be engineered to your drawings.

Do you offer OEM valve manufacturing?

Yes. In addition to our own KR brand, we provide OEM services, including customer branding, specified body and seat materials, actuation options and project-specific packaging.

Should I choose a wafer or a lug butterfly valve?

Wafer butterfly valves are lighter and more economical and are clamped between two flanges, making them ideal for standard water and HVAC lines. Lug butterfly valves have threaded lugs that allow dead-end service and removal of downstream piping without draining the whole line, which suits maintenance-critical systems.

How is valve quality controlled before shipment?

Every process is inspected from raw material to finished product, and 100% of finished valves are inspected before dispatch. Production plans and lead times are defined upfront through full-chain supply control.

Wholesale Single acting pneumatic three eccentric butterfly valve hard seal 150LB Manufacturers, Factories

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Wholesale Single acting pneumatic three eccentric butterfly valve hard seal 150LB Manufacturers, Factories

Type：Triple Eccentric

Series：D643H-150LB

Size: DN40-DN600/2”-24”

Pressure rating: PN6/PN10/PN16/5K/10K/150LB/300LB/600LB

Design standard: API/EN/JIS

Service: OEM&ODM

The pneumatic flanged triple offset metal hard seal butterfly valve adopts metal-to-metal sealing, featuring fast pneumatic automation, high temp & abrasion resistance, bi-direction tight shutoff for high-pressure steam, flue gas and chemical pipeline isolation & modulation.

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Product Description

Product Overview & Specifications

Valve Type:	Flange butterfly valve	Structure:	Eccentric
Standard:	API/EN/JIS	Workmanship:	Investment casting
Sealing direction:	Bidirectional	Sealing grade:	Zero leakage
Temperature:	-190°C < T < 700°C	Operation:	Handle

Characteristics

This pneumatic flanged metal-to-metal butterfly valve features hard alloy overlay sealing between disc and seat plus triple eccentric design for friction-free operation and self-tightening bidirectional zero leakage. With solid integrated flanged body and rack-and-pinion pneumatic actuator available in double or spring return type, it can be fitted with solenoid valves and positioners for remote automatic control. Its streamlined disc brings low flow resistance and large flow capacity, delivering outstanding resistance to high temperature and particle abrasion for severe service pipelines.

Key Advantages

1. Durable Sealing for Harsh Service

Metal-to-metal hard alloy seal resists high temperature and particle erosion, avoiding rubber aging and prolonging service life greatly.

2. Tight Shutoff Under High Pressure

Triple eccentric friction-free design realizes self-tightening sealing, achieving reliable bidirectional zero leakage at high differential pressure.

3. Safe Automatic & Stable Installation

Robust flanged connection is vibration-proof; pneumatic actuator provides explosion-proof quick operation and convenient remote control with low maintenance cost.

4. Fast Pneumatic Automatic Control

Rack & pinion actuator realizes 90° quick on/off within 1~5s; spring return(air fail close) or double acting available, fitted with solenoid/positioner for remote cut-off and modulating control.

Application Scenarios

The single acting pneumatic hard seal butterfly valve is mainly used for municipal heating steam, power plant flue gas & desulfurization duct, metallurgical furnace hot air pipe, petrochemical thermal oil & fuel gas line, industrial wastewater and exhaust treatment system.

Packaging Details

Standard export wooden case packaging

Material Specifications

Part Name	Material Options
Valve body	WCB, QT450-10, Q235, Alloy steel, stainless steel, etc.
Valve stem	Alloy steel, stainless steel
Seal ring	Stainless steel composite multi-level
Packing	Flexible graphite or stuffing
Valve seat	Stainless steel, cobalt based hard alloy
Valve stem	Stainless steel

Dimensions & Technical Parameters

PN (MPa)	DN (mm)	L	D	D1	D2	Z-φd	b	f	H	H0	A	B
1.0	150	140	285	240	211	8-φ22	24	2	385	230	66	150
	200	152	340	295	266	8-φ22	24	2	471	297	85	170
	250	165	395	350	319	12-φ22	26	2	533	327	85	170
	300	178	445	400	370	12-φ22	26	2	606	364	106	205
	350	190	505	460	429	16-φ22	26	2	694	404	106	205
	400	216	565	515	480	16-φ26	26	2	757	444	130	240
	450	222	615	565	530	20-φ26	28	2	814	472	155	240
	500	229	670	620	582	20-φ26	28	2	902	522	169	306
	600	267	780	725	582	20-φ30	30	5	1048	590	198	324
	700	292	895	840	794	24-φ30	30	5	1277	810	220	335
	800	318	1015	950	901	24-φ33	32	5	1385	844	241	356
	900	330	1115	1050	1001	28-φ33	34	5	1490	890	241	356
	1000	410	1230	1160	1112	28-φ36	34	5	1985	1228	241	356
	1200	470	1455	1380	1328	32-φ39	38	5	2191	1340	35	785
	1400	530	1675	1590	1530	36-φ42	42	5	2326	1450	35	785
	1600	600	1915	1820	1750	40-φ48	46	5	2685	1590	35	785
	1800	670	2115	2020	1950	44-φ48	50	5	2924	1710	60	865
1.6	150	140	285	240	211	8-φ22	24	2	385	230	66	150
	200	152	340	295	266	8-φ22	24	2	471	297	85	170
	250	165	395	350	319	12-φ22	26	2	533	327	85	170
	300	178	445	400	370	12-φ22	32	2	606	364	106	205
	350	190	505	460	429	16-φ22	34	2	694	404	106	205
	400	216	565	515	480	16-φ26	36	2	757	444	130	240
	450	222	615	565	530	20-φ26	38	2	814	472	155	240
	500	229	670	620	582	20-φ26	42	2	902	522	169	306
	600	267	780	725	582	20-φ30	44	5	1048	590	198	324
	700	292	895	840	794	24-φ30	46	5	1277	810	220	335
	800	318	1015	950	901	24-φ33	48	5	1385	844	241	356
	900	330	1115	1050	1001	28-φ33	34	5	1490	890	241	356
	1000	410	1230	1160	1112	28-φ36	38	5	2010	1245	241	356
	1200	470	1455	1380	1328	32-φ39	42	5	2220	1360	35	785
	1400	530	1675	1590	1530	36-φ42	44	5	3437	1456	35	785
	1600	600	1915	1820	1750	40-φ48	46	5	2756	1650	35	785
	1800	670	2115	2020	1950	44-φ48	48	5	2985	1760	60	865

Frequently Asked Questions (FAQ)

Q What are the key advantages of a triple eccentric metal-to-metal butterfly valve?

The triple eccentric design eliminates friction between the disc and valve seat during 90° rotation. Combined with hard alloy overlay sealing, it delivers self-tightening bidirectional zero leakage, superior wear resistance, and reliable performance under high temperatures.

Q What temperature ranges can this flanged butterfly valve withstand?

This hard seal butterfly valve is engineered for extreme working environments, capable of operating effectively across a temperature range from -190°C up to 700°C.

Q What pneumatic actuator options can be paired with this valve?

It can be equipped with rack-and-pinion pneumatic actuators available in double-acting or spring return (air fail close) types. Optional accessories such as solenoid valves, limit switches, and positioners can be integrated for automated remote control.

Q In which industrial applications is this valve typically installed?

It is widely applied in municipal steam heating, power plant flue gas desulfurization systems, metallurgical hot air lines, petrochemical thermal oil and fuel gas pipelines, as well as industrial wastewater and exhaust treatment systems.

Q How is the valve packaged for export and international transit?

All products are safely enclosed in standard export wooden cases to protect against mechanical impact, moisture, and corrosion during ocean or long-distance freight.

Wholesale Single acting pneumatic three eccentric butterfly valve hard seal 150LB Manufacturers, Factories

Product Description

Product Overview & Specifications

Characteristics

Key Advantages

Application Scenarios

Packaging Details

Material Specifications

Dimensions & Technical Parameters

Frequently Asked Questions (FAQ)

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