Worm wheel butterfly valve
The butterfly plate of the worm wheel butterfly valve is installed in the diameter direction of the pipe. In the cylindrical passage of the butterfly valve body, the disc-shaped disc rotates around the axis, and the rotation angle is between 0° and 90°. When the rotation is 90°, the valve is fully open.
The worm wheel butterfly valve is simple in structure, small in size and light in weight, and is composed of only a few parts. Moreover, it can be quickly opened and closed by rotating 90°, and the operation is simple, and the valve has good fluid control characteristics. When the flange butterfly valve is in the fully open position, the thickness of the disc is the only resistance when the medium flows through the valve body, so the pressure drop generated by the valve is small, so it has better flow control characteristics. The butterfly valve has two sealing types: elastic seal and metal seal. Elastomeric sealing valve, the sealing ring can be mounted on the valve body or attached to the periphery of the disc.
Valves with metal seals generally have a longer life than elastomeric seals, but are difficult to seal completely. Metal seals can accommodate higher operating temperatures, while elastomeric seals have temperature-limited defects.
If a butterfly valve is required for flow control, the main choice is the correct size and type of valve. The structural principle of the butterfly valve is especially suitable for making large diameter valves. Butterfly valves are widely used not only in general industries such as petroleum, gas, chemical, and water treatment, but also in cooling water systems for thermal power plants.
Common butterfly valves are clip-on butterfly valves and flanged butterfly valves . The wafer type butterfly valve uses a stud bolt to connect the valve between the two pipe flanges. The flange type butterfly valve has a flange on the valve, and the flanges on both ends of the valve are connected to the pipe flange by bolts.
When in the fully open position, the thickness of the disc is the only resistance when the medium flows through the valve body, so the pressure drop generated by the valve is small, so it has better flow control characteristics. The butterfly valve has two sealing types: a spring seal and a metal seal. Elastomeric sealing valve, the sealing ring can be mounted on the valve body or attached to the periphery of the disc.
I. Use and main performance specifications:
1.1 Scope of application
D341H-1.6C metal sealing butterfly valve is suitable for temperature ≤400 °C.
D341X-1.6C soft sealing valve is suitable for temperature 90 - 100 °C.
They are suitable for use as an opening and closing device on industrial pipes such as air, water, steam and oil.
1.2 Valve performance specifications
　　
| Model specification 　　 | Pressure test (MPa) 　　 | Working temperature (°C) 　　 | Applicable medium 　　 | ||
| strength 　　 | seal 　　 | Gas seal 　　 | |||
| D341H-1.6C DN150 and DN300 　　 | 2.4 　　 | 1.76 　　 | 0.6 　　 | ≤425 　　 | Water, steam, air and oil 　　 |
| D341X-1.6C DN150 　　 | ≤100 　　 |
2. Working principle and structure description
2.1 Structure: vertical plate structure, the valve stem is integral
2.1.1 The sealing ring of the metal hard sealing valve is a composite structure of flexible graphite plate and stainless steel plate, which is installed on the valve body, and the sealing surface of the butterfly plate is welded with stainless steel.
2.1.2 The sealing ring of the soft sealing valve is made of nitrile rubber and is mounted on the butterfly board. The valve body seat is welded to stainless steel.
2.2 Working principle
2.2.1 The design of the metal sealing valve is based on the principle of three eccentricity, using the inherent cam effect, completely eliminating the total friction between the valve seat and the sealing ring in the 90 degree stroke.
2.2.2 The design of the rubber soft sealing butterfly valve adopts a single eccentric structure. Unlike the soft seal of the middle line, the disc rotates about 20 degrees, and the valve seat and the sealing ring are quickly separated, thereby reducing friction.
2.3 valve driving method
The valve is driven by a worm gear manual mechanism. The handle is rotated 90° clockwise, the valve can be closed, and the handle is rotated 90° counterclockwise to open the valve. This type of valve should generally be installed horizontally in the pipeline.
3. Main parts and materials:
　　
| Model specification 　　 | Body/valve 　　 | Valve stem 　　 | Seal ring 　　 | filler 　　 |
| D341H-1.6C DN150 and DN300 　　 | WCB 　　 | 1Cr17Ni2 　　 | Flexible graphite + stainless steel 　　 | Flexible graphite 　　 |
| D341X-1.6C DN150 　　 | 1Cr13 　　 | Nitrile rubber 　　 |
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