Equalising valve

The utility model relates to a pressure reducing control valve which is suitable for petrochemical industry. The pressure reducing control valve is composed of an inlet connection, an outlet connection, a taper valve core, an O-ring, a valve body, a valve seat, an upper bearing block, a lower bearing block, a hand wheel, a screw rod, a slide valve, and a valve core spring. Adopting the structure of an O-shaped piston valve increases the bearing ability, and provides a user having multivariant media and pressure specification with a pressure reducing control valve which can carry out adjustment and voltage stabilization for the downstream pressure of a current pressure system and is economic and easy in use and maintenance. The utility model is universal for many media, such as gas and liquid, and is a compatible pressure reducing control valve for low, medium, and high pressure. The utility model has the characteristics of simple structure, convenient operation, low cost, easy manufacture and implementation, etc.