The STB-G3/4 is a two-way flow restrictor that allows for precise throttling of hydraulic fluid in both directions. Unlike one-way valves, this unit provides equal resistance from Port A to B and Port B to A. It is constructed with a robust carbon steel body featuring a specialized anti-corrosion surface treatment. The valve utilizes a needle-type internal mechanism made of hardened steel to ensure a high-precision seal and minimal leakage under high-pressure conditions. The adjustment knob includes a graduated scale for repeatable settings and a locking screw to prevent accidental adjustments during machine operation.