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KAI WEI XI CHAN PIN FEN LEI

D673H Pneumatic Triple-Eccentric Control Butterfly Valve
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Phone：+86（577）6730 7899
Mobile：+86 195 1816 9569
Fax：+86（577）6738 7099
Email：Lucas@kaiweixi.com
Address：No. 1, Linxia Road, Oubei Street, Yongjia County, Wenzhou City, Zhejiang Province,china
Website：https://www.kaiweixi.com

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D673H Pneumatic Triple-Eccentric Control Butterfly Valve

Model：D673H-10C/D673H-16C/D673H-25C/D673H-10P/D673H-16P/D673H-25P/D673H-10R/D673H-16R/D673H-25R
Specification：DN50~400
Temperature：-40～300℃
Medium：Water, air, steam, corrosive media, oil, food products, etc

Pressure：PN1.0～2.5MPa
Connection method：Wafer
Driving method：Pneumatic
Material：Cast steel, stainless steel, duplex stainless steel

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D673H Pneumatic Triple-Eccentric Control Butterfly ValveOverview

The D673H pneumatic triple-offset regulating butterfly valve is an industrial automation execution unit consisting of a high-performance pneumatic piston actuator and a triple-offset multi-level hard-seated butterfly valve body. By receiving standard 4-20mA DC analog signals from the control system, the electro-pneumatic positioner converts the signal into pneumatic power to drive the disc rotation within a 0-90 degree range. Its unique triple-offset design (shaft offset from flow center, shaft offset from seal center, and seal cone axis offset from flow axis) allows the disc to detach from the seat instantly upon opening, fundamentally eliminating mechanical friction and wear between sealing pairs. Featuring a metal hard-seal structure, this series offers high temperature/pressure resistance, erosion resistance, and tight shut-off, making it ideal for petroleum, chemical, power, and metallurgy industries where precise regulation and harsh conditions coexist.

Product Image of D673H Pneumatic Triple-Eccentric Control Butterfly Valve

D673H Pneumatic Triple-Eccentric Control Butterfly ValveCharacteristic

1、The valve seat and disc sealing surfaces are treated through processes such as overlay welding with stainless steel, Stellite alloy, or hard material coating, forming a highhardness metal sealing pair. This design offers excellent wear and erosion resistance, with a service life significantly exceeding that of softsealed butterfly valves.

2、Multi Eccentric Design
Utilizing single eccentric, double eccentric, or tripleeccentric construction, the disc instantly separates from the seat during valve operation, achieving frictionfree opening and closing. This results in low operating torque and minimal wear on the sealing surfaces.

3、High Temperature and HighPressure Performance
The metal hard seal structure enables the valve to withstand higher operating temperatures (typically up to 425°C or above) and higher working pressures, making it suitable for hightemperature and highpressure media such as steam, thermal oil, and hot flue gas.

4、Pneumatic Rapid Control
Equipped with a highperformance pneumatic actuator (piston or vane type), the valve provides fast opening and closing speeds. It supports remote automatic control and integration with DCS/PLC systems to meet automated process control requirements.

5、Excellent Sealing Performance
Relying on the wedgelike compression effect generated by the eccentric design, the valve ensures tight contact of the metal sealing surfaces when closed. It offers reliable bidirectional sealing, with leakage levels reaching ANSI Class VI or higher standards.

6、Corrosion and Abrasion Resistance
The high hardness of the metal sealing surfaces, combined with the option of corrosionresistant alloy materials or surface hardening treatments for the valve body and key components, effectively resists medium corrosion and erosion from solid particles. Suitable for slurry or fluegas pipelines containing dust or particulate matter.

7、FireSafe Design
Selected models incorporate firesafe functionality. In the event of a fire, the metal sealing pair can maintain a certain degree of sealing performance even after any soft sealing materials are destroyed, preventing largescale media leakage. Complies with firesafety standards such as API 607.

8、Long Service Life and Low Maintenance
Thanks to minimal friction and high wear resistance, the valve delivers extended service life. Maintenance intervals are prolonged, allowing for longterm maintenancefree operation under normal conditions, significantly reducing overall lifecycle costs.

D673H Pneumatic Triple-Eccentric Control Butterfly Valvestructure principle

Structural Diagram of D673H Pneumatic Triple-Eccentric Control Butterfly Valve

Parts List and Materials Specification

No.	Name	Material C	Material P
1	Hexagon Socket Screw	1Cr18Ni9Ti	1Cr18Ni9Ti
2	Bonnet	WCB	1Cr18Ni9Ti
3	Gasket	1Cr18Ni9Ti	1Cr18Ni9Ti
4	Seat	Stainless Steel + Flexible Graphite, PTFE
5	Gasket	1Cr18Ni9Ti	1Cr18Ni9Ti
6	Disc	WCB	ZG1Cr18Ni9Ti
7	Cylindrical Pin	45	1Cr18Ni9Ti
8	Bottom Cover	WCB	ZG1Cr18Ni9Ti
9	Gasket	Stainless Steel + Flexible Graphite, PTFE	215/240
10	Bushing	PTFE Composite Bearing	240/262
11	Body	WCB	ZG1Cr18Ni9Ti
12	Stem	1Cr13	1Cr18Ni9Ti
13	Yoke	WCB	WCB
14	Key	45	45
15	Bushing	PTFE Composite Bearing
16	Packing	Flexible Graphite, PTFE
17	Gland	WCB	ZG1Cr18Ni9Ti

D673H Pneumatic Triple-Eccentric Control Butterfly Valvetechnology parameter

Performance Specification Sheet

Performance Specification Sheet
Nominal Pressure	1.0	1.6	2.5	MPa
Strength test pressure	1.5	2.4	3.8
Sealing test pressure	1.1	1.76	2.8
Applicable Temperature	-40-300			℃

D673H Pneumatic Triple-Eccentric Control Butterfly Valvestandard size

Standard requirements for external dimensions

1. The structural length of the valve shall comply with the standard of GB/T12221

2. Connecting flanges according to GB/T17241.6 standard

Outline Diagram of D673H Pneumatic Triple-Eccentric Control Butterfly Valve

Overall Dimension Table

DN	L	L1	L2	H	H1	D1
50	43	159/211	83/95	277/205	65	125
65	46	211/248	95/107	287/315	75	145
80	46	248/269	107/123	365/375	85	160
100	52	269/315	123/141	420/436	130	180
125	56	315/345	141/152	436/462	175	210
150	56	345/409	152/172	466/543	190	240
200	60	409/438	172/187	593/665	215	295
250	68	438/559	187/215	682/752	265	355
300	78	550/600	215/240	725/772	305	410
350	78	600/633	240/262	832/880	340	470
400	102	633/730	262/330	862/968	360	525

Articles related to technology research and development

Dynamic balance electric control valve Patent

The utility model provides a dynamically balanced electric regulating valve, which includes a valve body, a valve cover, a valve rod, a valve core installed inside the valve body and connected to the valve rod, and an actuator installed on the valve cover and connected to the top end of the valve rod. The valve body is internally provided with a water inlet chamber, a valve cavity, and a water outlet chamber in order towards the direction of medium flow. The valve core is in the shape of a bucket with its opening facing downwards. The valve core is located inside the valve cavity and is used for connecting or cutting off between the water inlet chamber and the valve cavity. The top of the valve core is provided with a through port for medium circulation. Above the through port, there is a filter cover detachably connected to the valve core. The valve rod is provided with a step, and the outside of the step is covered with an elastic sleeve that fits it. The top of the filter cover is provided with a fixing hole that fits the elastic sleeve. This utility model can filter the medium, is simple to install, time-saving, labor-saving, and can reduce the medium pressure inside the valve body, extending the service life of the valve core.
1. A dynamic balance electric regulating valve, comprising a valve body, a valve cover, a valve rod, a valve core installed inside the valve body and connected to the valve rod, and an actuator installed on the valve cover and connected to the top end of the valve rod. Its characteristic lies in that the valve body is sequentially provided with an inlet chamber, a valve cavity, and an outlet chamber in the direction of medium flow. The valve core is in the shape of a bucket with an opening facing downwards. The valve core is located inside the valve cavity and is used for connecting or cutting off between the inlet chamber and the valve cavity. The top of the valve core is provided with a port for medium circulation. Above the port, there is a filter cover detachably connected to the valve core. The valve rod is provided with a step, and the outside of the step is covered with an elastic sleeve that fits it. The top of the filter cover is provided with a fixing hole that fits the elastic sleeve.
2. A dynamic balance electric regulating valve according to claim 1, characterized in that the bottom of the valve body is provided with a downward-opening groove, which is connected to the valve cavity through a through hole. A bottom cover connected to the valve body is arranged below the groove, and a pressure relief mechanism is arranged inside the groove. The pressure relief mechanism comprises a force-receiving member, a pressure plate connected to the force-receiving member, and a first spring arranged below the pressure plate and abutting against the bottom cover. The force-receiving member comprises a flow diversion block protruding from the through hole and a connecting rod connected to the flow diversion block, and the connecting rod passes through the pressure plate and is locked and fixed by a nut.
3. A dynamic balance electric regulating valve according to claim 2, characterized in that the top end of the pressure plate is pressed against the top wall of the groove, the bottom of the pressure plate is provided with a boss, and the top end of the first spring is sleeved on the boss.
4. A dynamic balance electric control valve according to claim 1, characterized in that the valve rod is arranged through the valve cover, a sealing cover threadedly connected to the valve cover is sleeved on the valve rod, a convex ring abutting against the valve cover is arranged on the outer circumferential wall of the sealing cover, a nut cover threadedly connected to the sealing cover is arranged at the connection between the sealing cover and the valve rod, an installation groove is arranged at the connection between the nut cover and the valve rod, a plurality of O-rings adapted to the valve rod are stacked in the installation groove, and a packing gland threadedly connected to the installation groove is arranged above the O-rings.
5. A dynamic balance electric control valve according to claim 4, characterized in that a second spring is arranged between the packing gland and the O-ring.
6. A dynamic balance electric control valve according to claim 5, characterized in that a sealing ring adapted to the valve rod is arranged inside the nut cover below the installation groove.
7. A dynamic balance electric control valve according to claim 6, characterized in that the bottom of the sealing cover is provided with a thrust ring that is threadedly connected to the sealing cover and abuts against the bottom end of the valve cover.
8. A dynamic balance electric regulating valve according to claim 1, characterized in that the top surface of the elastic sleeve is higher than the top surface of the filter cover.
9. A dynamic balance electric control valve according to claim 8, characterized in that the filter cover is connected to the valve core through threads.

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Product classification of Kaiweixi

KAI WEI XI CHAN PIN FEN LEI

D673H Pneumatic Triple-Eccentric Control Butterfly Valve

More Pneumatic Control Valve>>

More control valve>>

More valve>>

D673H Pneumatic Triple-Eccentric Control Butterfly Valve