Seat and valve systems for use in delayed coker system
View Patent ↗The present invention provides more efficient, cost effective coke drum valve devices and system as well as more efficient, cost effective methods for isolating the flow of matter in a delayed coker unit operation. Specifically, embodiments of the invention relate to various seat systems used in valves for delayed coking operations.
1. A valve seat system comprising:
a bifurcated first seat comprising an upper first seat segment biased against a lower first seat, wherein when the upper first seat segment is positioned on top of the lower first seat segment, a cavity is formed between the upper first seat segment and the lower first seat segment, the upper first seat segment being connected to the lower first seat segment by one or more shoulder bolts which limit the downward movement of the lower first seat segment when the position of the upper first seat segment remains fixed, the one or more shoulder bolts extending from the upper first seat segment through the cavity and into the lower first seat segment;
at least one spring disposed within the cavity between the upper and lower first seat segments, each spring biasing the lower first seat segment away from the upper first seat segment;
a packing gland disposed within the cavity between the upper and lower first seat segments; and
a blind in contact with the lower first seat segment, wherein the spring allows the lower first seat segment to move vertically with the contour of the blind as the blind is slid within the valve seat system while the upper first seat segment remains fixed.
2. The valve seat system of claim 1 , further comprising at least one of an outer packing or an inner packing gland disposed within the cavity between the upper first seat segment and the lower first seat segment, the outer or inner packing glands being compressed when the lower first seat segment moves vertically thereby sealing the cavity.
3. The valve seat system of claim 1 , further comprising a steam line by which the cavity is pressurized with steam.
4. The valve seat system of claim 1 , wherein the cavity includes one or more spring pockets, each spring pocket extending into the upper and lower first seat segments to accommodate one of the at least one springs.
5. The valve system of claim 1 , further comprising:
an inner packing gland and an outer packing gland, wherein the inner and outer packing glands are each positioned on top of the packing gland against a vertical wall of either the upper or lower first seat segment.
6. The valve seat system of claim 1 , wherein the packing gland is fixed to the upper first seat segment thus forming a lower shoulder recess between the packing gland and the lower first seat segment when the lower first seat segment has been displaced downwardly.
7. A valve seat system comprising:
a first seat;
a second seat aligned with said first seat;
a blind comprising a planar surface that contacts a lower edge of the first seat and an upper edge of the second seat;
wherein the first seat comprises:
an upper seat segment biased against a lower first seat, wherein when the upper first seat segment is positioned on top of the lower first seat segment, a cavity is formed between the upper first seat segment and the lower first seat segment, the upper first seat segment being connected to the lower first seat segment by one or more shoulder bolts which limit the downward movement of the lower first seat segment when the position of the upper first seat segment remains fixed, the one or more shoulder bolts extending from the upper first seat segment through the cavity and into the lower first seat segment;
at least one spring disposed within the cavity between the upper and lower first seat segments, each spring biasing the lower first seat segment away from the upper first seat segment; and
a packing gland disposed within the cavity between the upper and lower first seat segments;
wherein the spring allows the lower first seat segment to move vertically with the contour of the blind as the blind is slid between the first and second seats while the upper first seat segment remains fixed.
8. The valve seat system of claim 7 , further comprising at least one of an outer packing and an inner packing gland disposed in the cavity between the upper first seat segment and the lower first seat segment.
9. The valve seat system of claim 7 , wherein the inner and outer packing gland are each positioned on top of the packing gland against a vertical wall of either the upper or lower first seat segment.
10. The valve seat system of claim 7 , wherein the packing gland comprises a vertical wall structured to operably interact with a vertical wall of one of the lower first seat segment and the upper first seat segment.
11. The valve seat system of claim 7 , wherein the one or more shoulder bolts are displaced upwardly when the lower first seat segment moves upwardly.
12. The valve seat system of claim 7 , wherein the packing gland is fixed to the upper first seat segment such that a gap is formed between the packing gland and the lower first seat segment when the lower first seat segment is displaced downwardly.
13. The valve seat system of claim 7 , wherein the cavity is formed by vertical walls of the lower first seat segment which extend up to a bottom surface of the upper first seat segment.
14. The valve seat system of claim 7 , wherein the packing gland is fixed to the upper first seat segment by at least one of the one or more shoulder bolts.
15. The valve seat system of claim 9 , wherein the packing gland is forced upwardly against the inner and outer packing glands when the lower first seat segment is moved upwardly thereby causing the inner and outer packing glands to become compressed between the packing gland and the upper first seat segment.
16. A bifurcated seat assembly, comprising:
an upper seat segment that is fixed to the body of a valve;
a lower seat segment configured to be positioned below the upper seat segment within the bifurcated seat assembly, wherein, when the lower seat segment is positioned below the upper seat segment, a cavity is formed between the upper and lower seat segment;
one or more shoulder bolts that extend from the upper seat segment through the cavity and into the lower seat segment, the one or more shoulder bolts limiting the downward movement of the lower seat segment;
one or more springs positioned within the cavity between the upper and lower seat segments, each spring applying a force to the upper and lower seat segment to bias the lower seat segment away from the upper seat segment; and
a packing gland positioned within the cavity between the upper and lower seat segments.
17. The bifurcated seat assembly of claim 16 , wherein at least one of the one or more shoulder bolts secures the packing gland against a bottom surface of the upper seat segment, the bifurcated seat assembly further comprising:
an inner packing gland and an outer packing gland that are positioned within the cavity on top of the packing gland, wherein when the lower seat segment is moved upwardly, the packing gland also moves upwardly and compresses the inner and outer packing glands thereby sealing the cavity.
18. The bifurcated seat assembly of claim 16 , wherein the one or more shoulder bolts move upwardly with respect to the upper seat segment when the lower seat segment is moved upwardly.