metal to metal Archives

The triple eccentric metal seated butterfly valve is a high-quality valve category with high reliability and a wide range of applications. The triple eccentric butterfly valve is composed of main components such as valve body, butterfly

D673H-16C-stainless steel pneumatic triple eccentric butterfly valve

plate, valve stem, multi-layer metal sealing ring, shaft seal and drive mechanism. Its advantages are solid structure, good sealing performance, small torque, easy automatic control, etc. The triple eccentric butterfly valve is suitable for a variety of demanding working conditions, and has a wide range of applications in petroleum refining, natural gas extraction, chemical industry, power stations, metallurgy, and urban heating. However, things have two sides, and there are many problems in the use of the three-eccentric metal seated butterfly valve.
1. The butterfly plate of the triple eccentric butterfly valve is fixed with multiple layers of soft and hard stacked sealing rings. When the butterfly plate is in the open state, the circulating medium will directly wash the sealing surface. The soft sealing material in the metal sheet sandwich is in the long-term wash of the medium. It will directly affect the sealing performance of the valve.
2. The triple eccentric butterfly valve is not suitable for valves with a diameter smaller than DN200 because of its own structural constraints, the entire butterfly plate is very heavy and the flow resistance is very large.
3. The sealing between the butterfly plate sealing surface and the valve seat of the triple eccentric butterfly valve is to press the butterfly plate against the valve seat by the torque of the transmission device. When the medium in the pipeline is in a state of positive flow, the higher the pressure of the medium, the tighter the sealing and squeezing. But when the medium in the pipeline flows back, the pressure of the medium may cause seal leakage.
In order to solve the problems existing in the use of the triple eccentric butterfly valve, a high-performance triple eccentric two-way metal seated butterfly valve was developed. For the two-way sealing triple eccentric butterfly valve, the seat sealing ring is composed of multiple layers of stainless steel sheets on both sides of the soft T-shaped sealing ring. The sealing surface of the butterfly plate and the valve seat is an oblique cone structure, and then a high temperature and corrosion resistant alloy material is surfacing on the sealing surface of the oblique cone structure, and the spring fixed between the pressure plate of the adjusting ring and the adjusting bolt of the pressure plate are assembled together .
This special structure effectively compensates for the elastic deformation between the shaft sleeve of the triple eccentric butterfly valve and the valve body, and perfectly solves the problem that the triple eccentric butterfly valve is prone to leakage during the two-way interchangeable medium delivery process. The soft T-shaped sealing ring composed of multilayer stainless steel sheets on both sides not only has the advantages of a metal seated material, but also has the characteristics of a soft sealing material. Therefore, the three-eccentric butterfly valve with two-way sealing is suitable for both low temperature and high temperature conditions. Under the conditions, it can maintain excellent sealing performance.

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

Butterfly valves are suitable for flow regulation. Because the pressure loss of the butterfly valve in the pipeline is relatively large, the robustness of the butterfly plate to withstand the pressure of the pipeline medium when closing should also be considered. In addition, the working temperature limit of the elastic seat material

ductile iron, DI, butterfly valve, manufacturer, center line, TH valve

must be considered at high temperatures. The structure length and overall height of the butterfly valve are small, the opening and closing speed is fast, and it has good fluid control characteristics. The structure principle of the butterfly valve is most suitable for making large-diameter valves. When the butterfly valve is required for flow control, the most important thing is to correctly select the size and type of the butterfly valve so that it can work properly and effectively.

Generally, in throttling, adjustment control and mud medium, the structure length is required to be short, and the opening and closing speed is fast (1/4 turn). Low pressure cut-off (small differential pressure), butterfly valve is recommended.

Butterfly valve can be used when there are two-position adjustment, narrowing channel, low noise, cavitation and gasification, small leakage into the atmosphere, and abrasive media.

Throttle adjustment under special working conditions, or strict sealing requirements, or severe wear, low temperature (cryogenic) and other working conditions when using butterfly valves, need to use special design metal seal triple-eccentric or double eccentric Butterfly valve with adjustment device.

5 double-eccentric-butterfly-valve-2

The butterfly valve is suitable for requirements to achieve complete sealing, zero gas test leakage, high life requirements, and operating temperature between -10 degrees and 150 degrees. Applicable medium is fresh water, sewage, sea water, salt water, steam, natural gas, food, medicine, oil products And various acids and bases.

The soft seal eccentric butterfly valve is suitable for bidirectional opening and closing and adjustment of the ventilation and dust removal pipeline, and is widely used in gas pipelines and water channels in metallurgy, light industry, electric power, and petrochemical systems.

The metal-to-metal line sealed double eccentric butterfly valve is suitable for gas, oil, acid and alkali pipelines such as urban heating, gas supply, water supply, etc., as a regulating and throttling device.

In addition to being used as a large-scale pressure swing adsorption (PSA) gas separation device program control valve, the metal-to-metal face sealed triple-eccentric butterfly valve can also be widely used in the fields of petroleum, petrochemical, chemical, metallurgy, electric power, etc. as replacement product.

Posts

Problems Existing in the Use of Triple Eccentric Butterfly Valves

Applicable occasions of butterfly valve

TH VALVE • PROFESSIONAL VALVE MANUFACTURER

GET IN TOUCH WITH US

Tag Archive for: metal to metal

Posts

TH VALVE • PROFESSIONAL VALVE MANUFACTURER

GET IN TOUCH WITH US