Control valve

1. A method, comprising:

selectively moving a movable gate in a cavity of a valve body between an open position and a closed position relative to a passage through the valve body, wherein the open position has an open portion having only one fluid passage of the movable gate opening fluid flow through the passage, and the closed position has a closed portion of the movable gate blocking fluid flow through the passage; and

throttling fluid flow via a throttling section disposed along the passage, wherein the throttling section comprises a plurality of perforated plates defining a plurality of non-straight passages, the plurality of non-straight passages overlap with the only one fluid passage in the open portion in the open position of the movable gate, and the plurality of non-straight passages overlap with the closed portion in the closed position of the movable gate wherein selectively moving the movable gate comprises moving the movable gate along a surface of a first perforated plate of the plurality of perforated plates between the open position and the closed position.

2. The method of claim 1 , wherein selectively moving the movable gate comprises moving the movable gate parallel to the plurality of perforated plates.

3. The method of claim 1 , wherein throttling the fluid flow comprises directing the fluid flow through at least a one passage of the plurality of non-straight passages defined by a series of staggered openings in the plurality of perforated plates, wherein the series of staggered openings are laterally offset and overlapping from one plate to another in the plurality of perforated plates.

4. The method of claim 1 , wherein selectively moving the movable gate comprises moving the movable gate to overlap the only one fluid passage in the open portion with a plurality of openings in the first perforated plate of the plurality of perforated plates.

5. A gate valve, comprising:

a valve body, comprising:

a passage extending though the valve body;

a cavity that intersects the passage;

a movable gate disposed in the cavity, wherein the movable gate comprises an open portion having only one fluid passage and a closed portion, and the movable gate is configured to selectively move between an open position having the open portion opening flow through the passage and a closed position having the closed portion closing flow through the passage; and

a throttling section disposed along the passage, wherein the throttling section comprises a plurality of perforated plates defining a plurality of non-straight passages, the plurality of non-straight passages overlap with the only one fluid passage in the open portion in the open position of the movable gate, and the plurality of non-straight passages overlap with the closed portion in the closed position of the movable gate, and the movable gate is configured to move along a surface of a first perforated plate of the plurality of perforated plates between the open position and the closed position.

6. The gate valve of claim 5 , wherein the plurality of perforated plates are parallel to the movable gate.

7. The gate valve of claim 5 , wherein the plurality of non-straight passages comprise at least one passage defined by a series of staggered openings in the plurality of perforated plates, wherein the series of staggered openings are laterally offset and overlapping from one plate to another in the plurality of perforated plates.

8. The gate valve of claim 5 , wherein the throttling section is stationary, the open portion of the movable gate is configured to selectively open flow through the passage and the plurality of non-straight passages in the open position of the movable gate, and the closed portion of the movable gate is configured to selectively close flow through the passage and the plurality of non-straight passages in the closed position of the movable gate.

9. The gate valve of claim 5 , wherein the plurality of perforated plates comprises the first perforated plate and a second perforated plate, the first perforated plate has an end wall and a side wall extending circumferentially about a chamber, and the second perforated plate is disposed in the chamber of the first perforated plate.

10. The gate valve of claim 9 , wherein the plurality of perforated plates comprises a third perforated plate disposed in a recess in the valve body outside of the chamber of the first perforated plate.

11. The gate valve of claim 9 , wherein the plurality of perforated plates comprises a third perforated plate disposed in the chamber of the first perforated plate.

12. The gate valve of claim 5 , wherein the plurality of non-straight passages comprise at least one passage that extends in a direction that gradually diverges away from an axis of the passage over at least three perforated plates of the plurality of perforated plates.

13. The gate valve of claim 5 , wherein the plurality of non-straight passages comprise at least one passage that extends in a direction that gradually converges toward an axis of the passage over at least three perforated plates of the plurality of perforated plates.

14. The gate valve of claim 5 , wherein the plurality of perforated plates define one or more straight passages.

15. The gate valve of claim 5 , wherein the plurality of perforated plates comprises the first perforated plate made of a first material and a second perforated plate made of a second material, and the first and second materials are different from one another.

16. The gate valve of claim 5 , wherein the plurality of perforated plates comprises the first perforated plate having a first dimension and a second perforated plate having a second dimension, and the first and second dimensions are different from one another.

17. The gate valve of claim 5 , wherein the plurality of perforated plates comprises the first perforated plate having a first opening and a second perforated plate having a second opening, and the first and second openings are sized different from one another.

18. The gate valve of claim 5 , wherein the valve body comprises a lateral access passage extending crosswise to an axis of the passage, and lateral access passage is configured to enable installation and removal of the movable gate and the plurality of perforated plates of the throttling section.

19. The gate valve of claim 5 , wherein the first material is harder than the second material, and the second material is more ductile than the first material.

20. A gate valve, comprising:

a valve body, comprising:

a passage extending though the valve body;

a cavity that intersects the passage;

a movable gate disposed in the cavity, wherein the movable gate comprises an open portion having only one fluid passage and a closed portion, and the movable gate is configured to selectively move between an open position having the open portion opening flow through the passage and a closed position having the closed portion closing flow through the passage; and

a throttling section disposed in a stationary position along the passage, wherein the throttling section comprises a plurality of perforated plates defining a plurality of throttling passages, and the plurality of perforated plates are parallel to the movable gate wherein the movable gate is configured to move along a surface of a first perforated plate of the plurality of perforated plates between the open position and the closed position, the plurality of throttling passages overlap with the one fluid passage in the open portion in the open position of the movable gate, and the plurality of throttling passages overlap with the closed portion in the closed position of the movable gate.

21. The gate valve of claim 20 , wherein the plurality of throttling passages comprise at least one passage that extends in a first direction that gradually diverges away from an axis of the passage over at least three perforated plates of the plurality of perforated plates, or extends in a second direction that gradually converges toward the axis of the passage over at least three perforated plates of the plurality of perforated plates, or a combination thereof.

22. The gate valve of claim 20 , wherein the plurality of throttling passages comprise at least one passage defined by a series of staggered openings in the plurality of perforated plates, wherein the series of staggered openings are laterally offset and overlapping from one plate to another in the plurality of perforated plates.