pinless butterfly valve Archives

The pinless wafer butterfly valve contains two connection methods, one is pinless and the other is wafer. A pinless butterfly valve is a pinless butterfly valve that does not use a pin to penetrate the connection between the valve plate and the valve stem. For comparison of pin butterfly valves and pinless butterfly valves, please refer to valve knowledge. The wafer butterfly valve is connected between two pipe flanges with stud bolts, without flanges.

JIS 10K-wafer butterfly valve-backup seat (4)

Commonly used pinless butterfly valves include wafer type butterfly valves and flange type butterfly valves, so flange type butterfly valves are often compared with wafer type butterfly valves. The biggest difference between the two is the connection method during installation. Now let’s take a look at what to pay attention to when installing the pinless wafer butterfly valve.
1. During installation, the valve disc should be stopped in the closed position.
2. The opening position should be determined according to the rotation angle of the butterfly plate.
3. For the butterfly valve with bypass valve, the bypass valve should be opened before opening.
4. The installation should be carried out according to the installation instructions of the manufacturer, and the heavy-weight butterfly valve should be installed with a firm foundation.
5. The butterfly plate of the pinless wafer butterfly valve is installed in the diameter direction of the pipeline. In the cylindrical passage of the butterfly valve body, the disc-shaped butterfly plate rotates around the axis, and the rotation angle is between 0-90°. When the rotation reaches 90°, the valve is fully open.
6. If the butterfly valve is required to be used as a flow control, the main thing is to select the size and type of the valve correctly. The structure principle of the butterfly valve is especially suitable for making large-diameter valves. Butterfly valves are not only widely used in general industries such as petroleum, gas, chemical, and water treatment, but also used in cooling water systems of thermal power stations.
The price of the pinless wafer butterfly valve is roughly 2/3 of that of the pinless flange butterfly valve, which is relatively cheap, but the sealing performance is not as good as that of the flange butterfly valve. When choosing imported valves, use wafer butterfly valves as much as possible because they are cheap and light in weight. One of its limitations is that there are no flanges at both ends of the valve body, and there are only a few guide bolt holes. The valve is connected to the end flange with a set of bolts/nuts. Compared with the flanged butterfly valve, it is much more convenient to disassemble, and the valve cost is lower, but the disadvantage is that one sealing surface has a problem, and both sealing surfaces have to be disassembled. The paired flanges of the clip-on type are butt welded and cannot be installed by socket welding.
The pinless wafer butterfly valve also has its own advantages, that is, it saves space, and try to use wafer butterfly valves when the piping position is tight. The biggest difference between the pinless wafer butterfly valve and the flangeless butterfly valve is that the wafer butterfly valve saves a pair of flanges, so the cost is relatively cheap, but it is not conducive to the disassembly and assembly of maintenance, etc., where permitted, priority Choose a wafer butterfly valve. Wafer butterfly valves are generally used in industrial pipelines with relatively low pressure and relatively safe transport media.

TH Valve is a professional manufacturer of butterfly valve, gate valve, check valve, globe valve, knife gate valve, ball valve with API, JIS, DIN standard, used in Oil, Gas, Marine industry, Water supply and drainage, fire fighting, shipbuilding, water treatment and other systems, with Nominal Diameter of DN50 to DN1200, NBR/EPDM/VITON, Certificates & Approvals: DNV-GL, Lloyds, DNV, BV, API, ABS, CCS. Standards: EN 593, API609, API6D
Video of center-lined butterfly valve:

We often hear such statements as pinless butterfly valves and pinless butterfly valves in the purchase of butterfly valves. Because of technological reasons, pinless butterfly valves are usually more expensive than pinned butterfly valves. This makes many customers think whether pinless butterfly valves are more expensive than pinless butterfly valves. Is it better to have a pin butterfly valve? How does a pin butterfly valve compare with a pinless butterfly

Wafer butterfly valve-PN20-WCB-ANSI-150 (3)

valve? This article introduces Tanghai Valve for you.
From the appearance point of view of the pin butterfly valve and the pinless butterfly valve, the most essential difference is whether there is a tapered pin positioning on the valve plate. The connection method that uses a pin to penetrate the valve plate and the valve stem is a pin butterfly valve, and vice versa is a pinless butterfly valve. For pin butterfly valves and pinless butterfly valves, they have their own advantages and disadvantages. The specific situation is as follows:
Appearance comparison-the pinned butterfly valve has obvious pin head protrusions, which is not as smooth and beautiful as a pinless butterfly valve, but in fact it does not have a huge impact on the overall appearance.
Process comparison-the structural processing technology of the pin butterfly valve will be relatively simple, but if it needs to be repaired after long-term use, it will be more troublesome to disassemble the shaft and valve plate. Because the pin usually hit is that the pile pin is hard pressed up with a press, it is not easy to take out the valve stem. The pinless butterfly valve is relatively complicated in structure and technology because of the different ways of

wafer-type-butterfly-valve-with-handle-13

transmitting torque, but the later maintenance and disassembly are more convenient and convenient for repair.
Stability comparison——Because the pin butterfly valve is fixed with pins, the stability is definitely better than the pinless structure. The pinless structure affects the accuracy of the action due to the wear of the mating surface of the axle and the gate after long-term action. Therefore, the quality of pinless butterfly valves produced by manufacturers without mature processing technology and equipment is more worrying. This is also to remind customers and friends that if there is a demand for non-sold butterfly valves, you must choose a manufacturer with sound qualifications and mature production experience like Tanghai Valve. After all, Tanghai Valve has been in the valve manufacturing industry for 24 years, and it will be more professional in terms of quality, craftsmanship and management.
Sealing comparison-Finally, let’s take a look at the comparison of sealing effects. There is a saying that in actual use, the pin butterfly valve may see the medium from the pinned place to between the valve plate and the valve stem. The hidden danger brought by this is that the pin will be corroded and broken after a long time, causing the valve to fail to work, or the ejector rod leakage or the internal leakage of the pipeline. However, many manufacturers have begun to notice this problem. For example, Tanghai will choose to weld a layer of pins on the valve plate and shaft to prevent leakage from the pins.
In summary, compared with pin butterfly valves and pinless butterfly valves, objectively speaking, each design has its own characteristics and advantages, and one cannot simply say which one is better. As long as we choose the product that is most suitable for our cost budget and most suitable for our working conditions, it is a good product that suits us.

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Precautions for installation of pinless wafer butterfly valve

Comparison of pin butterfly valve and pinless butterfly valve

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