German EVORAL valves EVORAL models EVORAL prices

EVORAL valves are devices used in fluid systems to control the direction, pressure, and flow rate of fluids. They enable the medium (liquid, gas, powder) within piping and equipment to flow or stop and allow control over its flow rate. Valves are control components in pipeline fluid transport systems, used to change the cross-sectional area of the passage and the direction of medium flow. They perform functions such as flow guidance, shut-off, throttling, check, diversion, or overflow pressure relief. Valves for fluid control range from simple stop valves to various types used in highly complex automatic control systems, with a wide variety of types and specifications. The nominal diameter of valves ranges from extremely small instrument valves to industrial pipeline valves with diameters up to 10m. They can be used to control the flow of various types of fluids such as water, steam, oil, gas, slurry, various corrosive media, liquid metals, and radioactive fluids. The operating pressure of valves can range from 0.0013MPa to ultra-high pressures of 1000MPa, and the operating temperature can range from ultra-low temperatures of c-270°C to high temperatures of 1430°C. Valve control can adopt various actuation methods, such as manual, electric, hydraulic, pneumatic, turbine, electromagnetic, electro-hydraulic, pneumatic-hydraulic, spur gear, and bevel gear drives. They can operate according to predetermined requirements under the influence of pressure, temperature, or other sensor signals, or perform simple opening or closing without relying on sensor signals. Valves rely on drive or automatic mechanisms to make the closing member perform lifting, sliding, swinging, or rotating movements, thereby changing the size of the flow passage area to achieve their control function.

EVORAL valve connection method: internal self-tightening connection

The various connection forms mentioned above utilize external force to counteract medium pressure and achieve sealing. The following introduces the self-tightening connection form that utilizes medium pressure. Its sealing ring is installed at the inner cone, with the side facing the medium forming a certain angle. The medium pressure is transmitted to the inner cone and then to the sealing ring. On the conical surface at a certain angle, two component forces are generated: one parallel to the valve body centerline outward, and the other pressing against the inner wall of the valve body. The latter component force is the self-tightening force. The greater the medium pressure, the greater the self-tightening force. Therefore, this connection form is suitable for high-pressure valves. It saves considerable material and labor compared to flange connections, but also requires a certain preload to ensure reliability when the internal valve pressure is not high. Valves made using the self-tightening sealing principle are generally high-pressure valves. There are many other forms of valve connections. For example, some small valves that do not need to be removed are welded directly to the pipe; some non-metallic valves use socket connections, etc. Valve users should handle specific situations accordingly.

EVORAL valve assembly precautions

Cleaned parts must be sealed and stored for installation. The requirements for the installation process are as follows: 1) The installation workshop must be kept clean, or a temporary clean area must be set up, for example, using newly purchased striped cloth or plastic film, to prevent dust from entering during installation. 2) Assembly workers must wear clean cotton work clothes, cotton caps with no hair exposed, clean shoes, and degreased plastic gloves. 3) Tools used for assembly must be degreased and cleaned before assembly to ensure cleanliness.

EVORAL valve applications

The self-operated pressure regulating valve (hereinafter referred to as the pressure valve) is an energy-saving product that automatically regulates pressure by relying solely on the pressure changes of the medium itself, without requiring an external energy source. It integrates measurement, actuation, and control functions. It is widely used in industrial sectors such as petroleum, chemical, metallurgy, and light industry, as well as in urban heating and space heating systems. This product can be used as a pressure control device for non-corrosive media, including liquids, gases, and steam, with a maximum temperature of 350 °C.

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