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Top mounted eccentric hemispherical valve

Design criteriaGBT 12237-2007 API608 AFI6D-2005

Structure lengthGB/T12221-2007 XH923-2004 ASMEANSIB16.10

Connecting flangeGB/T91 13-20D7ASMEIANSIB16.5

Inspection and testGB/T13927-2005 API598

Product overview

The upper eccentric hemispherical valve uses the eccentric principle, that is, the center of the flow channel is not concentric with the crankshaft.

During the closing process of the valve, the ball crown gradually moves towards the valve seat to realize reliable sealing at the moment of approaching, so as to avoid that the sealing pair is always in the friction state during the opening and closing process of door B. the valve ball is hemispherical, and in the open state of the wide door, the ball crown is hidden in the cavity to prevent the sealing surface from being directly washed by the medium; At the same time, ensure the flow of the whole flow channel of the valve to minimize energy loss. The head loss is almost zero. Using the special Gongba method, the stainless steel ball with fine grinding is moved to the fluororubber sealing ring.

It has soft and hard seals, which can realize reliable sealing even when the soft seal is worn or damaged. On the cushion seat of this structure, the upper and lower valve stems are equipped with thrust bearings and composite shaft sleeves to reduce the transmission torque, which has prominent advantages in the selection of electric actuators.

Product features

Low fluid resistance. The resistance coefficient is equal to that of the pipe section with the same length. The utility model has the advantages of simple structure, small rest area and light weight.

Tight and reliable. At present, the sealing surface of ball valve is widely made of plastic with good sealing performance. It has also been widely used in vacuum systems.

Easy to operate. Quick opening and closing. From full open to full close, it can be controlled remotely as long as it rotates 90 °.

Convenient maintenance. The ball valve has simple structure and the sealing ring is generally movable. Disassembly and replacement are quite convenient.

When fully open or fully closed, the sealing surface of the ball and valve seat is isolated from the medium. When the medium passes through, it will not cause the erosion of the valve sealing surface.