Top cover for a soft throttling valve body, soft throttling valve and method for assembling a soft throttling valve

Patent metadata

Field	Value
Publication number	US-11067191-B2
Application number	US-201716345964-A
Country	US
Kind code	B2
Filing date	Oct 27, 2017
Priority date	Nov 1, 2016
Publication date	Jul 20, 2021
Grant date	Jul 20, 2021

Abstract

The present invention relates to a top cover ( 5 ) for soft throttling valve body ( 2 ), the top cover ( 5 ) comprising one or more fluid conduits for transferring a pilot fluid flow for setting a degree of opening of a main valve situated in a soft throttling valve body to the soft throttling valve body. Furthermore, the invention relates to a soft throttling valve ( 1 ) and a method for assembling the soft throttling valve ( 1 ). The object of the invention is to allow a good control of the pilot fluid flow while protecting the soft throttling valve body from damage due to valve failure. The object is solved by having a follower arrangement arranged to throttle the pilot fluid flow depending on the degree of opening of the main valve, further having a manual opening arrangement for manually opening the main valve and/or by further preventing a step-wise opening of the main valve in less than two opening steps. A method for assembling a soft throttling valve is also disclosed.

First claim

What is claimed is:

1. A top cover for a soft throttling valve body, the top cover comprising
one or more fluid conduits for transferring a pilot fluid flow for setting a degree of opening of a main valve situated in the soft throttling valve body to the soft throttling valve body, wherein
the top cover comprises a pilot arrangement arranged to throttle the pilot fluid flow, the pilot arrangement being arranged to throttle the pilot fluid flow depending on the degree of opening of the main valve, wherein the top cover comprises at least two pilot valves wherein a first pilot valve can be opened in a first step and a second pilot valve can then be opened in a second step and the top cover further comprises a manual opening arrangement for manually opening the main valve and/or the top cover being adapted to prevent a step-wise opening of the main valve in less than two opening steps.

2. The top cover according to claim 1 , wherein the manual opening arrangement is arranged to actuate a pilot element of the pilot arrangement so as to manually open the main valve.

3. The top cover according to claim 2 , wherein the manual opening arrangement comprises a spindle collinearly arranged with the pilot element, the spindle being arranged to actuate the pilot element.

4. The top cover according to claim 3 , wherein the manual opening arrangement and the pilot arrangement are arranged in a stacked configuration.

5. The top cover according to claim 3 , wherein the manual opening arrangement and the pilot arrangement form a common sub-assembly.

6. The top cover according to claim 2 , wherein the manual opening arrangement and the pilot arrangement are arranged in a stacked configuration.

7. The top cover according to claim 2 , wherein the manual opening arrangement and the pilot arrangement form a common sub-assembly.

8. The top cover according to claim 1 , wherein the manual opening arrangement and the pilot arrangement are arranged in a stacked configuration.

9. The top cover according to claim 8 , wherein the manual opening arrangement and the pilot arrangement form a common sub-assembly.

10. The top cover according to claim 1 , wherein the manual opening arrangement and the pilot arrangement form a common sub-assembly.

11. The top cover according to claim 1 , wherein the top cover comprises two or more pilot valves arranged in a common pilot fluid flow path through the top cover, the top cover being adapted to block the pilot fluid flow path between two of the pilot valves.

12. The top cover according to claim 11 , wherein a pilot fluid passage fluidly connecting a first pilot valve and a second pilot valve mounted to the top cover, the first pilot valve blocking the pilot fluid passage to the second pilot valve when the first pilot valve is in a closed state.

13. The top cover according to claim 1 , wherein the top cover is adapted to provide a protected soft-open operation mode and a non-protected soft-open operation mode.

14. The top cover according to claim 13 , wherein the top cover comprises three or more pilot valve sockets.

15. The top cover according to claim 1 , wherein the pilot arrangement comprises a pilot element which comprises the fluid conduit, the pilot element comprising an inlet orifice and an outlet orifice for passing a pilot fluid flow through the fluid conduit of the pilot element.

16. A soft throttling valve comprising:
an inlet;
an outlet; and
a main valve having a valve seat between said inlet and said outlet, the soft throttling valve comprises a pilot arrangement arranged to throttle the pilot fluid flow, the pilot arrangement being arranged to throttle the pilot fluid flow depending on a degree of opening of the main valve, wherein the soft throttling valve comprises at least two pilot valves wherein a first pilot valve can be opened in a first step and a second pilot valve can then be opened in a second step and the top cover and the soft throttling valve further comprises a manual opening arrangement for manually opening the main valve and/or the soft throttling valve being adapted to prevent a step-wise opening of the main valve in less than two opening steps, wherein the soft throttling valve is arranged for throttling the main valve in such a way that a pressure shock is reduced.

17. The soft throttling valve according to claim 16 , wherein the manual opening arrangement is arranged to actuate a pilot element of the pilot arrangement so as to manually open the main valve.

18. The soft throttling valve according to claim 16 , wherein the soft throttling valve comprises two or more pilot valves arranged in a common pilot fluid flow path through the soft throttling valve, the soft throttling valve being adapted to block the pilot fluid flow path between two of the pilot valves.

19. The soft throttling valve according to claim 16 , wherein the soft throttling valve comprises a soft throttling valve body and a top cover.

Assignees

• Danfoss As

Inventors

• Vestergaard Niels P
• Matzen Detlef
• Kanajam Rajakumar
• Venkatesh Raghavendra
• Fabricius Torben Schack

Classifications

• F25B47/022

  hot gas defrosting · CPC title

• F16K31/1245

  with more than one valve · CPC title

• F16K31/1221 Primary

  one side of the piston being spring-loaded · CPC title

• F25B41/20

  Disposition of valves, e.g. of on-off valves or flow control valves (expansion valves F25B41/31) · CPC title