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Gemels valves, also known as flap valves, are simple-structure control valves. Butterfly valves, used for on/off control of media in low-pressure pipelines, refer to valves where the closing element (valve disc or butterfly plate) is a disk that rotates around the valve shaft to achieve opening and closing. Valves can be used to control the flow of various types of fluids such as air, water, steam, various corrosive media, slurry, oil products, liquid metals, and radioactive media. They mainly serve to cut off and throttle flow in pipelines. The opening and closing element of a butterfly valve is a disk-shaped butterfly plate that rotates around its own axis within the valve body to achieve opening, closing, or regulation.

Gemels valve operating principle

A butterfly valve is a valve that uses a disk-shaped closing element to reciprocate and rotate approximately 90° to open, close, or regulate media flow. Butterfly valves not only have a simple structure, small size, light weight, low material consumption, small installation dimensions, low driving torque, and simple and rapid operation, but also offer good flow regulation functions and shut-off sealing characteristics, making them one of the fastest-developing valve types in recent years. Butterfly valves are widely used. Their varieties and quantities continue to expand, developing towards high temperature, high pressure, large diameter, high sealing, long life, excellent regulation characteristics, and multi-functionality. Their reliability and other performance indicators have reached a high level.

Gemels valve cleaning steps

Valve components must undergo the following processes before assembly: 1) According to processing requirements, some components need polishing; the surface must not have machining burrs, etc.; 2) All components undergo degreasing treatment; 3) After degreasing, perform acid pickling and passivation; the cleaning agent must not contain phosphorus; 4) After acid pickling and passivation, rinse thoroughly with pure water to ensure no chemical residue remains; this step is omitted for carbon steel components; 5) Wipe each component dry with non-woven fabric, ensuring no lint remains on the component surface, or blow dry with clean nitrogen; 6) Wipe each component with non-woven fabric or precision filter paper soaked in analytically pure alcohol until no dirt color remains.

Gemels valve application scenarios

Butterfly valves are suitable for flow regulation. Due to the significant pressure loss of butterfly valves in pipelines, the robustness of the butterfly plate to withstand pipeline media pressure during closure must also be considered. Additionally, the temperature limits of the elastic seat material under high temperatures must be taken into account. Butterfly valves have a short structural length and overall height, fast opening and closing speeds, and good fluid control characteristics; their structural principle is most suitable for manufacturing large-diameter valves. When using butterfly valves for flow control, it is most important to correctly select the size and type of the butterfly valve to ensure proper and effective operation. Typically, for throttling, regulation control, and slurry media, short structural length and fast opening/closing speed (1/4 rotation) are required. For low-pressure shut-off (small pressure difference), butterfly valves are recommended. Butterfly valves can be selected for two-position regulation, reduced-port channels, low noise, cavitation and vaporization phenomena, slight leakage to the atmosphere, and abrasive media. For throttling regulation under special working conditions, or when strict sealing is required, or under severe wear, low temperature (cryogenic), and other working conditions, special design metal-sealed triple-offset or double-offset dedicated butterfly valves with regulation devices must be used. Butterfly valves are suitable for fresh water, sewage, seawater, salt water, steam, natural gas, food, pharmaceuticals, oil products, and various acid and alkali pipelines requiring complete sealing, zero gas test leakage, high life expectancy, and operating temperatures between -10 degrees and 150 degrees. Soft-sealed offset butterfly valves are suitable for bidirectional opening/closing and regulation in ventilation and dust removal pipelines, widely used in coal gas pipelines and water channels in metallurgy, light industry, electric power, and petrochemical systems. Metal-to-metal line-sealed double-offset butterfly valves are suitable for urban heating, gas supply, and water supply pipelines for coal gas, oil products, acids, and alkalis, serving as regulation and throttling devices. Metal-to-metal face-sealed triple-offset butterfly valves are not only used as program control valves for large-scale pressure swing adsorption (PSA) gas separation devices but are also widely used in petroleum, petrochemical, chemical, metallurgical, and electric power fields, serving as good alternatives to gate valves and globe valves.

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