Unloading spherical stop valve

• Main Authors: LIU HAIDONG, LU HEPING, MA HUAIYONG, WANG RUNHONG, YANG WANCHAO
• Format: Patent
• Language: Chinese; English
• Published: 26.05.2010
• Subjects: EARTH DRILLING; FIXED CONSTRUCTIONS; GALLERIES; LARGE UNDERGROUND CHAMBERS; MINING; SHAFTS; TUNNELS

The utility model relates to an unloading spherical stop valve, which comprises a valve body, and a support pad and a gasket arranged in the valve body. A straight slotted steel ball is arranged between the support pad and the gasket; a sealed contact surface between the gasket and the straight slotted steel ball is provided with an unloading slot; and the unloading slot is communicated with a liquid inlet of the valve body. Through the reverse unloading balanced action of the unloading slot which is arranged on the sealed contact surface between the gasket and the straight slotted steel ball and communicated with the liquid inlet of the valve body, the unloading spherical stop valve can greatly offset the positive surface pressure of a reversing steel ball on the gasket, and correspondingly reduce the friction between the steel ball and the gasket, and easily rotate a reversing handle manually, which solves the problem that the operating torque of the high-pressure and mass-flow spherical stop valve is large