Focus On Triple Offset Butterfly Valve 


Large Size Flange Type Triple Butterfly Valve Offset DIN Standard

Model: d643h-10c

Origin: Oubei, Wenzhou

Type: flange type

Specification: DN 1200

Valve Body Material: WCB

Valve Disc Material: WCB

Valve Stem Material: 410

Sealing Material: SS304 + graphite

Driving Mode: Pneumatic

product details

Large size flange type triple butterfly valve offset is not only simple in structure, small in volume, light in weight, low in material consumption, small in installation size, small in driving torque, simple and fast in operation, but also has good flow regulating function and closing sealing characteristics. Especially in the application field of large and medium caliber, medium and low pressure, butterfly valve has become the dominant valve form.

1、 Structure introduction

DIN standard butterfly valve adopts three eccentric structure. The valve seat seal is metal multi-layer hard seal structure, which is usually sandwich between metal and graphite, such as 304 + graphite, 316 + graphite. Such hard seal can also be made into single-layer soft seal PTFE, rptfe, ppl, EPDM, NBR, etc

Three eccentric butterfly valve features:
1. Short structure size, small volume, light weight, easy to operate
2. Using the whole shaft mechanism, the butterfly plate has high strength and large flow area
3. The unique three eccentric design reduces the friction loss of the seal and greatly prolongs the service life
4. Metal hard seal is resistant to high temperature, low temperature and high pressure, and has a wide range of applications

2、Relevant standards of API standard butterfly valve

Design and manufacture: en 593
Structural length: en 558-1
Connecting flange: en 1092-1
Inspection and pressure test: en 12266-1
Any valve produced by our company is pressed in strict accordance with the pressure test standard, and the zero leakage butterfly valve is allowed to leave the factory only after the pressure is qualified.

Shell strengthSealing strength of high pressure waterAir seal strength

According to i1261 standard, strict pressure test can achieve zero leakage under the proposed pressure strength.
Accept the sampling inspection and full inspection of the third party quality inspection unit entrusted by the customer and the end customer, but explain to us what needs to be mentioned

3、Detailed connection size

Nominal pressureNominal size

Face to Face                


Flanged outer circle 

The drilling center D1

Sealing ring            


Step height

Flange                  thickness



PN 10DN 120047014551380133054432-39

4、Material of main parts

Valve Body: WCB 
Valve Disc: WCB
Stem: 410                    
Butterfly seal: SS304 + graphite
Bracket: WCB
Pneumatic actuator: QT450 



5、About our company

Tkok Valve  is a professional high quality butterfly valves manufacturers, focusing on research and development of butterfly valve series products.
The butterfly valves produced by Tkok Valve, both the valve body and valve disc all use designed casting molds by Tkok Valve company,not use the foundry no matter the wall thickness of the valve body,flange thickness and face to face dimensions,all can meet the requirement of relevant standard.
Tkok Valve mainly produce eccentric butterfly valves,high performance butterfly valves,and also have good supply for the centerline butterfly valves and fluorine-lined butterfly valves.

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