Lug Type Butterfly Valve

In several common connection ways of butterfly valves, the price of wafer type is the cheapest, followed by lug type butterfly valve, flange type butterfly valve is the most expensive, the price is proportional to the overall weight.

In the relevant standard, it is not clear whether the pressure hole of the lug type is a through hole or a threaded hole, so both on the market can be seen.

 1. For through hole lug type butterfly valve,it is installed in the same way as the wafer type butterfly valve, so its stability is not as good as flange type one.

 2. For threaded hole lug type butterfly valve, its installation way is different with the wafer type and the flange type, at this time the lug type butterfly valve’s holes are like nuts ,when connecting with the pipe flange, the bolts passes through the flange, the holes of the lug type butterfly valve are tightened directly with the bolts. 

This installation is stable ,even better than flange types.The lug type body has one integral flange with an identical hole pattern to the pipe flanges. Each hole is tapped from opposite direction, meeting in the center of the hole. This style allows the body to be placed between two flanges. A stud bolt can be inserted through the piping flange and threaded into the integral flange with a nut to secure the entire flange connection.The lug style designs are mainly used in thermal expansion applications in which the risks of straight-through bolting can't be taken while small size designs can't permit two integral flanges.

Features    

vertical center line disc    

Anti-Blow Out Stem    

Bi-Directional    

Fire safe Design    

Low Friction Body Seat    

Zero Leakage    

Standard Test    

Body Test: 1.5 times the working pressure with water. This test is performed after valve assembly and with disc in half position open, it is called as a body hydro test.    

Seat Test: 1.1 times the working pressure with water.    

Function / Operation Test: At the time of final inspection, each valve and its actuator (Flow-Control Lever / Gear / Pneumatic Actuator), under goes a complete operating test (Open/Close). This test carried out without pressure and at ambient temperature. It ensures the correct operation of the valve / actuator assembly with accessories such as solenoid valve, limit switches, air filter regulator etc.    

Special Test: On request, any other test can be carried out according to special instruction by client. 

Application    

1.Water Treatment Plant    

2.Breweries    

3.Drilling Rigs    

4. Heating & Air Conditioning    

5.Paper Industry    

6.Chemical Industry    

7.Gas Plant    

8.Pneumatic Conveyors    

9.Sugar Industry    

10.Waste Effluent Treatment Plant    

11.Cooling Water Circulation    

12.Compressed Air