Asymetrically cutting valve seats

Patent metadata

Field	Value
Publication number	US-10422197-B2
Application number	US-201415034230-A
Country	US
Kind code	B2
Filing date	Nov 18, 2014
Priority date	Nov 18, 2013
Publication date	Sep 24, 2019
Grant date	Sep 24, 2019

Abstract

The invention provides a cutting valve comprising a valve block, a gate, which is slidably within a cavity in the valve block from an open position to a closing and cutting position, an upper seat arranged in an upper part of the valve between the valve block and the gate, and a lower seat arranged in a lower part of the valve between the valve block and the gate, The valve further comprises an upper resilient member arranged between the upper seat and a lower resilient member arranged between the valve block and the lower seat. The cutting valve being distinctive in that the combination of height of upper seat, and lower seat, resilient member and any spacers on the lower side of the gate is selected so that an allowed travelling distance for the upper seat towards the valve block and an allowed travelling distance for the lower seat towards the valve block, are substantially equal.

First claim

The invention claimed is:

1. A combined gate and cutting valve comprising:
a valve block and a gate, the gate being defined by a single plate and being slidable horizontally within a cavity in the valve block from an open position to a closed and cutting position, said gate having an upper cutting edge and a lower cutting edge formed on opposite faces of the single plate, the upper cutting edge and the lower cutting edge being arranged around an opening formed in said gate;
an upper seat arranged in an upper part of the valve between the valve block and the gate;
a lower seat arranged in a lower part of the valve between the valve block and the gate;
an upper resilient member arranged between the valve block and the upper seat;
a lower resilient member arranged between the valve block and the lower seat; and
wherein a combination of a height of the upper seat and a height of the upper resilient member, and a combination of a height of the lower seat and a height of the lower resilient member is selected to compensate for gravity forces of the gate so that a travelling distance for the upper seat towards the valve block and a travelling distance for the lower seat towards the valve block are equal.

2. The cutting valve according to claim 1 , wherein the resilient members comprising at least one upper spring, and at least one lower spring, said upper spring attached to the upper seat and said lower spring attached to the lower seat, the lower spring having a higher elasticity module than the upper spring.

3. The cutting valve according to claim 1 , comprising at least one shim arranged in the lower part of the valve block.

4. The cutting valve according to claim 3 , wherein the at least one shim is arranged between the lower resilient member and the valve block.

5. The cutting valve according to claim 3 , wherein the at least one shim is arranged between the lower seat and the lower resilient member.

6. The cutting valve according to claim 1 , wherein a first spring pocket attached to the lower seat is of a smaller depth than a second spring pocket attached to the upper seat.

Assignees

• Aker Solutions As

Inventors

• Herland Jan
• Grennberg Viktor

Classifications

• F16K3/20

  by movement of the seats · CPC title

• E21B33/06

  Blow-out preventers {, i.e. apparatus closing around a drill pipe, e.g. annular blow-out preventers (rotating blow-out preventers E21B33/085)} · CPC title

• F16K3/28

  with resilient valve members · CPC title

• F16K3/02

  with flat sealing faces; Packings therefor · CPC title

• E21B29/04 Primary

  Cutting of wire lines or the like (E21B29/02 takes precedence) · CPC title