Focus On Triple Offset Butterfly Valve 


Lug Type Triple Offset Butterfly Valve

Model: ltd373h-150lb

Origin: Oubei, Wenzhou

Type: convex

Specification: 18 inches

Valve Body material: WCB

Valve Disc material: WCB

Valve Stem material: 410

Sealing material: SS304 + graphite

Driving Mode: Worm Gear

product details

Lug Type triple offset butterfly valve is a kind of valve with lug connection, which has the advantage of short distance between two ends of the pipeline. It connects the flange of both ends of the pipeline with gold hoop bolts. For the convenience of installation and auxiliary fixation, it is generally used in the occasions with high strength of pipeline terminal and pipe network.

1、 Structure introduction

Convex butterfly valve, also known as branch butterfly valve, American standard convex butterfly valve adopts three eccentric structure. The seat seal is metal multi-layer hard seal structure, which is usually the interlayer of 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: API 609
Structural length: API 609
Connecting flange: ASME B16.5
Inspection and pressure test: API 598,
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

Under the above pressure, the zero leakage can be achieved.
Accept the sampling and full inspection of the third party quality inspection unit entrusted by the customer and the end customer, but explain to us in advance

3、Detailed connection size

Nominal pressureNominal sizeStructural lengthDrilling center distanceaperture
150LBNPS 18114577.916

4、Material of main parts

Body: WCB
Butterfly board: WCB
Stem: 410
Butterfly seal: SS304 + graphite
Bracket: WCB
Worm gear case: QT450
The default bracket is WCB, and the material of worm gear box is QT450. Our company can also produce WCB, CF8 and other materials according to customer demand

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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