Valve core of throttle valve for petroleum drilling manifold

Abstract

The invention discloses a valve core of a throttle valve for a petroleum drilling manifold. The valve core comprises a cylindrical valve core, and is characterized in that the side wall of the valve core is uniformly provided with two groups or more than two groups of orifices which are arrayed spirally; each group of orifices comprise two or more than two orifices; each orifice is communicated with the inner hole of the valve core; and the valve core as the further improvement provided by the invention, the pore diameter of each group of orifices which are arrayed spirally decreases from bottom to top. The valve core provided by the invention has the advantages of uniform stress and long service life, is easy to manufacture, and is difficult to leak.

Description

technical field [0001] The invention relates to a core part of a choke manifold used for oil drilling: a choke valve core. Background technique [0002] Such as figure 1 and figure 2 As shown, the spool 3 of the choke valve is widely used on the choke manifold at present. The hard alloy used is all raw materials, and its structure is disc-shaped. One end surface of the spool 3 and the valve seat of the choke valve The other side of the spool 3 is provided with a protruding ring 3a, and several grooves 3b for transmitting torque are provided on the protruding ring 3a, and a semicircular orifice 3c communicating with both sides of the spool 3 is biased on the spool 3, There is also an opening on the end surface where the valve seat is in contact with the valve core 3; when in use, the valve core 3 rotates on its axis, and when the semicircular throttle hole 3c communicates with the opening on the valve seat, the throttle valve opens ; When the semicircular throttle hole 3c...

AI Technical Summary

Problems solved by technology

[0002] like figure 1 and figure 2 As shown, the spool 3 of the choke valve is widely used on the choke manifold at present. The hard alloy used is all raw materials, and its structure is disc-shaped. One end surface of the spool 3 and the valve seat of the choke valve The other side of the spool 3 is provided with a protruding ring 3a, and several grooves 3b for transmitting torque are provided on the protruding ring 3a, and a semicircular orifice 3c communicating with both sides of the spool 3 is biased on the spool 3, There is also an opening on the end surface where the valve seat is in contact with the valve core 3; when in use, the valve core 3 rotates on its axis, and when the semicircular throttle hole 3c communicates with the opening on the valve seat, the throttle valve opens ; When the semicircular throttle hole 3c was isolated from the opening, the throttle valve was closed; but the disadvantages of the spool 3 were: 1) the end surface contact area was large; this required the contact plane between the valve seat and the spool 3 to be It has quite high flatness and surface finish, because in the case of closing, it needs to rely on the contact of two end faces to achieve sealing, which increases the difficulty of processing; 2) One-way opening; due to the one-way opening, when closing, the liquid in the well passes through The opening of the fixed valve seat exerts pressure on the valve core 3, causing the valve core 3 to be stressed in one direction, prone to rollover, forming gaps, and causing leakage. In addition, the one-way opening will inevitably lead to unstable liquid flow. Eddy current and turbulent flow areas, and the large opening and closing stroke (the rotation angle in the direction of the fillet is large) will increase the wear of the sealing surface and affect the service life

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