German Numatics valves, Numatics models, Numatics prices

Numatics 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 do not have 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.

Numatics Valve Classification

Throttle valves can be classified into straight-through and angle types based on the flow path; based on the shape of the closing element, there are needle, groove, and window types. Adjustable throttle valve: The valve needle and valve core 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 valve core adopts a low-noise balanced structure, making it easy to open. The product is designed according to API6A standards. The valve core surface is coated with tungsten carbide, making it suitable for harsh conditions such as flashing, high pressure differential, high pressure, and cavitation. It has a long service life and significantly improved flow regulation accuracy. It is applicable to industries such as petroleum, natural gas, chemical, refining, and hydropower.

Numatics Valve Applications

Since the flow rate of a throttle valve depends not only on the size of the throttle orifice area but also on the pressure difference before and after the orifice, and the valve has low stiffness, it is only suitable for applications where the actuator load changes very little and speed stability requirements are not high. For throttle speed control systems with large actuator load changes and high requirements for speed stability, pressure compensation must be applied to the throttle valve to keep the pressure difference across the valve constant, thereby achieving stable flow.

Numatics 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 accumulated deposits and adsorbates reach a certain thickness, they are washed away by the fluid flow, and then reattach 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, so clogging is more likely to occur 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 dilution and contamination of 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, and the "unstable components" therein undergo oxidation and condensation at high temperatures, forming oil sludge that adheres to the surface of the throttle valve. 5) Lubricating oil penetrating the turbocharger compressor: For turbocharged engines, exhaust gas drive is commonly adopted, that is, 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, and coupled with the multiplied charging efficiency, heavy oil contamination is more likely to form, exacerbating the deposition on the throttle 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 deposits on the throttle valve is cyclopentadiene, which can undergo oxidation and condensation under sustained high temperatures to form gummy oil sludge.

Weidou Intelligent Technology specializes in selling German Numatics valves, Numatics safety valves, Numatics globe valves, Numatics control valves, Numatics solenoid valves, Numatics ball valves, Numatics proportional valves, Numatics diaphragm valves, Numatics butterfly valves, Numatics hydraulic transmission valves, Numatics check valves, Numatics pressure reducing valves, Numatics relief valves, Numatics sequence valves, Numatics balance valves, Numatics throttle valves, and Numatics directional control valves. All are original imports from Germany. Customers are welcome to inquire and place orders.