German Alexanderwerk AG valves, Alexanderwerk AG models, Alexanderwerk AG prices

Alexanderwerk AG valves are valves that control fluid flow by changing the throttling cross-section or throttling length. Connecting a throttle valve and a check valve in parallel forms a one-way throttle valve. Throttle valves and one-way throttle valves are simple flow control valves. In hydraulic systems with fixed-displacement pumps, throttle valves used in conjunction with relief valves can form three types of throttle speed control systems: inlet throttle speed control, return line throttle speed control, and bypass throttle speed control. Throttle valves lack negative flow feedback functionality and cannot compensate for speed instability caused by load changes; they are generally used only in applications where load changes are small or where high speed stability is not required.

Alexanderwerk AG Valve Classification

Throttle valves can be classified into straight-through and angle types based on the flow path configuration. Based on the shape of the closing element, they are categorized as needle, groove, or window types. Adjustable throttle valve: The valve needle and spool are made of hard alloy. The product is designed according to API6A standards and features wear resistance and erosion resistance. It is mainly used for wellhead oil (gas) tree equipment. Sleeve-type throttle valve: The spool adopts a low-noise balanced structure for easy opening. The product is designed according to API6A standards. The spool surface is coated with tungsten carbide, making it suitable for harsh conditions such as flashing, high pressure differential, high pressure, and cavitation. It offers a long service life and significantly improved flow regulation accuracy. It is applicable to industries such as petroleum, natural gas, chemical, refining, and hydropower.

Alexanderwerk AG Valve Applications

Since the flow rate of a throttle valve depends not only on the size of the throttling orifice area but also on the pressure differential across the orifice, and due to the low stiffness of the valve, it is only suitable for applications where the actuator load variation is minimal and speed stability requirements are not high. For throttle speed control systems with significant actuator load variations and high speed stability requirements, pressure compensation must be applied to the throttle valve to maintain a constant pressure differential across the valve, thereby achieving stable flow.

Alexanderwerk AG Valve Installation and Maintenance

Observe the following precautions during installation and maintenance of the throttle valve: This valve requires frequent operation, so it should be installed in a location that is easy and convenient to access. During installation, ensure that the flow direction of the medium aligns with the arrow marked on the valve body. 1) Mechanical impurities in the hydraulic oil, or contaminants such as gums, asphaltenes, and carbon residues precipitated by oxidation, accumulate at the throttle gap. 2) Due to oil aging or compression, charged polarized molecules are generated, and a potential difference exists on the metal surface of the throttle gap, so the polarized molecules are adsorbed onto the gap surface, forming a firm boundary adsorption layer, with a typical thickness of 5~8 micrometers, thereby affecting the size of the throttle gap. When the above-mentioned accumulations and adsorbates grow to a certain thickness, they are washed away by the fluid flow, and then re-adhere to the valve orifice. This cycle repeats, resulting in flow pulsation. 3) When the pressure differential across the valve orifice is large, the temperature at the valve orifice is high, the degree of liquid compression increases, and the metal surface is more susceptible to friction-induced potential differences, making clogging more likely under high pressure differentials. 4) Source of PCV exhaust gas: Combustible mixture from the combustion chamber enters the crankcase through the piston clearance, forming a mixed gas with oil vapor. To avoid diluting and contaminating the engine oil, The mixture is drawn into the intake manifold by the Positive Crankcase Ventilation (PCV) system to participate in secondary combustion. After this portion of exhaust gas enters the intake manifold, it condenses into a liquid phase due to the temperature drop, the "unstable components" therein undergo oxidation and condensation at high temperatures, forming oil sludge on the throttle valve surface and adhering to it. 5) Lubricating oil penetrating deeply into the turbocharger compressor: For turbocharged engines, exhaust gas drive is commonly adopted, namely, using the high-pressure exhaust gas generated in the exhaust passage to drive the turbine, and driving the compressor blades in the intake passage via a common shaft, thereby boosting the airflow in the intake passage. However, under long-term and harsh operating conditions, the common shaft bearing is prone to lubricating oil penetration and volatilization, coupled with a multiplied increase in charging efficiency, making it easier to form heavy oil contamination that exacerbates the adhesion of deposits on the throttle valve body. 6) Fuel vapor discharged from the carbon canister: Among the fuel vapors adsorbed by the engine carbon canister, the primary component that easily forms throttle valve deposits is cyclopentadiene, which can undergo oxidation and condensation under sustained high temperatures to form gummy oil sludge.

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