German GKN Service valves, GKN Service models, GKN Service prices

GKN Service 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 fixed-displacement pump hydraulic systems, throttle valves used 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 and cannot compensate for speed instability caused by load changes; they are generally used only in applications with small load variations or low requirements for speed stability.

GKN Service Valve Classification

Throttle valves can be classified into straight-through and angle types based on flow path configuration; 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, allowing easy opening. 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 offers long service life and significantly improved flow regulation accuracy. It is applicable to industries such as petroleum, natural gas, chemical, refining, and hydropower.

GKN Service 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 difference before and after the orifice, and the valve has low stiffness, it is only suitable for applications where the actuator load variation is very small and speed stability requirements are not high. For throttle speed control systems with large actuator load variations 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.

GKN Service 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 to access for operation. During installation, ensure that the flow direction of the medium aligns with the arrow marked on the valve body. 1) Mechanical impurities in the oil, or contaminants such as gums, asphalts, 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 accumulations and adsorbates grow to 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 blockage is more likely to occur under high pressure differentials. 4) PCV exhaust gas source: 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 tract by the Positive Crankcase Ventilation (PCV) system to participate in secondary combustion. After this portion of exhaust gas enters the intake tract, 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 that adheres to the throttle valve surface. 5) Lubricating oil penetrating the turbocharger compressor: For turbocharged engines, exhaust gas drive is commonly adopted, namely, using the high-pressure exhaust gas generated in the exhaust tract to drive the turbine, and driving the compressor blades in the intake tract via a common shaft, thereby boosting the airflow in the intake tract. However, under long-term and harsh operating conditions, the common shaft bearing is prone to lubricating oil seepage and volatilization, and with the charging efficiency increasing multiplicatively, heavy oil contamination is more likely to form, exacerbating 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 prone to forming throttle valve deposits is cyclopentadiene, which can undergo oxidation and condensation under sustained high temperatures to form gummy oil sludge.

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