D343H-16P Hard Seal Butterfly Valve

Triple eccentric butterfly valve, D343H butterfly valve, cast steel butterfly valve, hard seal butterfly valve, Zhejiang butterfly valve,

Zhejiang Putian triple eccentric butterfly valve is suitable for flow regulation. Since the pressure loss of the butterfly valve in the pipeline is relatively large, the sturdiness of the butterfly plate bearing the pipeline medium pressure when closed should also be considered. In addition, the limitation of the working temperature that the elastic valve seat material can withstand at high temperatures must also be considered. The butterfly valve has a small structural length and overall height, fast opening and closing speed, and has fluid control characteristics. The structural principle of the butterfly valve is suitable for making large-diameter valves. When the butterfly valve is required to control the flow, it is important to correctly select the size and type of the butterfly valve so that it can work properly and effectively.

Zhejiang Putian triple eccentric butterfly valve is usually used in throttling, regulation control and slurry medium, requiring short structural length and fast opening and closing speed (1/4 turn). Low-pressure shut-off (small pressure difference), it is recommended to choose the butterfly valve.

Zhejiang Putian triple eccentric butterfly valve can be selected for two-position regulation, constricted channel, low noise, cavitation and vaporization phenomenon, slight leakage to the atmosphere, and abrasive medium.

Zhejiang Putian triple eccentric butterfly valve is used in special working conditions such as throttling regulation, or strict sealing requirements, or severe wear, low temperature (deep cold), etc. It is necessary to use a specially designed triple eccentric or double eccentric special butterfly valve with metal sealing belt regulation device.

Zhejiang Putian triple eccentric butterfly valve is suitable for fresh water, sewage, seawater, salt water, steam, natural gas, food, oil products and various acids, alkalis and other pipelines that require complete sealing, zero gas test leakage, high life requirements, and working temperature from -10 degrees to 150 degrees.

Zhejiang Putian soft seal eccentric butterfly valve is suitable for two-way opening and closing and regulation of ventilation and dust removal pipelines, and is widely used in gas pipelines and water pipelines of metallurgy, light industry, electric power, and petrochemical systems.

Zhejiang Putian triple eccentric metal-to-metal line seal double eccentric butterfly valve is suitable for urban heating, gas supply, water supply and other gas, oil products, acids, alkalis and other pipelines, as a regulation and throttling device.

Zhejiang Putian triple eccentric metal-to-metal surface seal triple eccentric butterfly valve, in addition to being used as a program control valve for large pressure swing adsorption (PSA) gas separation devices, can also be widely used in petroleum, petrochemical, chemical, metallurgy, electric power and other fields.

Working principle of Zhejiang Putian triple eccentric metal hard seal butterfly valve: The typical triple eccentric metal seal butterfly valve, in addition to the two eccentrics of the valve stem and the valve plate, the sealing surface of the valve plate and the valve seat is in the shape of an oblique circular platform (this is the so-called third eccentric of the triple eccentric). When the triple eccentric metal hard seal butterfly valve is closed, the valve plate is pushed forward due to the eccentricity. The valve plate and the valve seat do not generate friction during the closing process. The valve plate is directly pressed on the valve seat, which ensures the service life of the valve;

In addition, because the sealing ring of this valve (whether installed on the valve seat or the valve plate) has a certain elasticity, and there is a small gap between the boss in the elastic ring and the elastic ring that allows the elastic ring to move slightly; when the valve is closed, under the action of the closing force, the elastic sealing ring can automatically move to a position where the force is uniform; plus the slight deformation of the elastic ring, the sealing ring at the valve seat is evenly stressed to achieve a sealed state.

Performance changes of triple eccentric metal hard seal butterfly valves with different eccentric structures: In traditional concepts, butterfly valves can only be used in occasions with normal temperature, low pressure and low sealing requirements.

With the continuous development of modern process technology and material industry, the application range of Zhejiang Putian butterfly valve has far exceeded the past, and it can almost replace most traditional valves and is widely used in various fields of industry. Especially the triple eccentric metal seal butterfly valve is more eye-catching.

Since the closing of the triple eccentric butterfly valve, like the closing of the gate valve, is completed by torque, the greater the torque of the valve closing, the better the sealing of the valve seat, so some people call the triple eccentric butterfly valve a 90° rotating gate valve. In the major overhaul of factories, more and more triple eccentric butterfly valves replace gate valves. For this reason, some manufacturers of triple eccentric butterfly valves specially produce a triple eccentric butterfly valve with the same length as the gate valve, and call this triple eccentric metal seal butterfly valve a triple eccentric gate valve.

As the number of eccentrics of the Zhejiang Putian valve plate increases, the thickness of the valve plate also increases, so the resistance of the fluid flowing through the triple eccentric butterfly valve increases; as the number of eccentrics of the butterfly valve increases, the performance of the valve also changes greatly.

From the comparison of four different structure butterfly valves, it can be seen that the triple eccentric butterfly valve can produce a large pressure drop and can be used as a control valve; the pressure drop when the fluid flows through the valve increases with the increase of the number of eccentrics; but compared with some other non-butterfly valves, the pressure drop of the triple eccentric butterfly valve is still relatively small. As the number of eccentrics of the butterfly valve changes, the sealing performance of the valve seat also changes. The triple eccentric butterfly valve has excellent valve seat sealing performance. As the number of eccentrics increases, the torque required for valve opening and closing decreases, so the torque required for opening and closing of the triple eccentric butterfly valve is much smaller than that of other types of butterfly valves.

With the change of the number of eccentrics, the temperature and pressure rating range and applicable temperature range of the butterfly valve will also change greatly. The applicable temperature and pressure rating range of the triple eccentric butterfly valve is the best among other types of butterfly valves.

Advantages of triple eccentric butterfly valve: Good shut-off performance The triple eccentric metal seal butterfly valve uses torque to shut off the valve, so the valve seat has excellent sealing performance, so it is called a zero leakage valve. The solid particles or dirt in the medium have no obvious effect on the shut-off performance of the triple eccentric metal seal butterfly valve, because when the valve is close to closing, the medium flow rate is very high, so that the dirt cannot accumulate at the valve seat.

Characteristics of metal hard seal butterfly valve:

1. The butterfly plate sealing ring of Zhejiang Putian triple eccentric multi-layer metal hard seal butterfly valve is a soft and hard laminated metal sheet, which has the dual advantages of metal sealing and elastic sealing. It has excellent sealing performance both at low and high temperatures.

2. Bushings are installed at the upper and lower parts of the valve stem, and the wear and friction resistance generated by each bushing are very small. This structure can prevent wear and adhesion, and also improve the service life.