The Innovative Design of Deep In Situ Pressure Retained Coring Based on Magnetic Field Trigger Controller

Figure 12

Magnetic flux density norm nephogram of the valve cover when the valve seat consists of four identical shape tile magnets. (a) Scheme 4. (b) Scheme 5. (c) Scheme 6. (d) Scheme 7. (e) Scheme 8. (f) Scheme 9.

(a)

(b)

(c)

(d)

(e)

(f)