Back pressure valve
A mud backflow and valve body technology, applied in wellbore/well components, earthwork drilling, wellbore flushing, etc., can solve problems such as large amount of engineering, safety accidents, valve core failure, etc., to reduce grouting costs and eliminate Safety accidents and the effect of eliminating safety hazards
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Embodiment 1
[0038] see figure 1 , a back pressure valve, including a valve body 1, a valve core 2, a support seat 3 and a valve seat 4 arranged in the valve body 1, the support seat 3 is located below the valve seat 4, and the valve body 1 is provided with a piston 5. The piston 5 is set on the valve core 2, the valve body 1 has a mud return hole 6, the mud return hole 6 is located between the valve seat 4 and the piston 5, the mud return hole 6 and the valve body 1 The inner cavity is connected.
[0039] This embodiment is the most basic implementation. A piston is arranged in the valve body, and the piston is sleeved on the valve core. A mud return hole is opened on the valve body. The mud return hole is located between the valve seat and the piston. The mud return hole and the valve body The inner cavity is connected. By setting up a mud return hole on the valve body and connecting the mud return hole with the inner cavity of the valve body, when drilling, by lowering the drilling too...
Embodiment 2
[0041] see figure 2 , a back pressure valve, including a valve body 1, a valve core 2, a support seat 3 and a valve seat 4 arranged in the valve body 1, the support seat 3 is located below the valve seat 4, and the valve body 1 is provided with a piston 5. The piston 5 is set on the valve core 2, the valve body 1 has a mud return hole 6, the mud return hole 6 is located between the valve seat 4 and the piston 5, the mud return hole 6 and the valve body 1 The inner cavity is connected.
[0042] Described spool 2 comprises upper valve stem 7, conical block 8 and lower valve stem 9 successively from top to bottom, and the upper end of upper valve stem 7 is provided with fixing nut 10, and the lower end is connected with the small end of conical block 8, and the lower end is connected with the small end of conical block 8. One end of the valve rod 9 is connected with the large end of the conical block 8, and the other end extends into the support seat 3.
[0043] The valve seat...
Embodiment 3
[0049] see image 3 , a back pressure valve, including a valve body 1, a valve core 2, a support seat 3 and a valve seat 4 arranged in the valve body 1, the support seat 3 is located below the valve seat 4, and the valve body 1 is provided with a piston 5. The piston 5 is set on the valve core 2, the valve body 1 has a mud return hole 6, the mud return hole 6 is located between the valve seat 4 and the piston 5, the mud return hole 6 and the valve body 1 The inner cavity is connected.
[0050] Described spool 2 comprises upper valve stem 7, conical block 8 and lower valve stem 9 successively from top to bottom, and the upper end of upper valve stem 7 is provided with fixing nut 10, and the lower end is connected with the small end of conical block 8, and the lower end is connected with the small end of conical block 8. One end of the valve rod 9 is connected with the large end of the conical block 8, and the other end extends into the support seat 3.
[0051] The valve seat ...
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