alvand pressure screw , Iran

The pressure relief valve screw in Alvand trucks functions as a precision adjusting component within the oil and fuel circuits. This screw controls the internal spring of the relief valve to determine the maximum allowable system pressure. In heavy-duty diesel engines, a deviation of even 5 percent in screw adjustment can alter oil pressure by up to 2 bars. The material is typically alloy steel with heat treatment reaching 40 HRC hardness for resistance against cyclic fatigue loads. The screw features a fine metric thread such as M10×1.0 or M12×1.25 for micron-level adjustment precision. Effective thread length ranges from 25 to 40 millimeters to provide an adequate adjustment window for various operating conditions.

The screw head is commonly an Allen hexagon socket or square drive with standard dimensions of 8 to 12 millimeters. Tightening torque for the locking nut on this pressure relief screw is set between 8 to 12 Newton-meters. This torque prevents self-loosening caused by continuous vehicle vibration during long-haul operations. Before any disassembly, marking the original screw position relative to the valve body is absolutely essential. A single full turn of this screw typically changes the cracking pressure by approximately 5 to 8 bars depending on spring rate. Incorrect adjustment beyond the factory range can lead to premature pump wear or hydraulic line rupture. Always consult the Alvand truck service manual for model-specific pressure values before any calibration work.You can order and buy alvand pressure screw from Iran by contacting us through whatsaap and email.
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