Balanced regulator having a balanced trim including a variable pressure sense area

Patent metadata

Field	Value
Publication number	US-9678516-B2
Application number	US-201514625006-A
Country	US
Kind code	B2
Filing date	Feb 18, 2015
Priority date	Feb 20, 2014
Publication date	Jun 13, 2017
Grant date	Jun 13, 2017

Abstract

A balanced pressure regulator includes a valve body having a fluid inlet and a fluid outlet connected by a fluid passageway. A valve seat is disposed within the fluid passageway. A balanced plug assembly is disposed within the fluid passageway, the balanced plug assembly including a valve plug that cooperates with the valve seat to selectively open or close the fluid passageway, a retainer operatively connecting the valve plug to a valve stem, a diaphragm separating a chamber from the fluid passageway, a central balancing passage that fluidly connects the fluid passageway with the chamber, and a peripheral balancing passage that fluidly connects the fluid passageway with the chamber, the peripheral balancing passage being located between the retainer and the valve plug.

First claim

What is claimed is:

1. A balanced pressure regulator, comprising:
a valve body having a fluid inlet and a fluid outlet connected by a fluid passageway;
a valve seat disposed within the fluid passageway;
a balanced plug assembly disposed within the fluid passageway, the balanced plug assembly comprising;
a valve plug that cooperates with the valve seat to selectively open or close the fluid passageway;
a retainer operatively connecting the valve plug to a valve stem;
a diaphragm separating a chamber from the fluid passageway;
a central balancing passage that fluidly connects the fluid passageway with the chamber; and
a peripheral balancing passage that fluidly connects the fluid passageway with the chamber, the peripheral balancing passage being located between the retainer and the valve plug,
wherein the retainer is movable relative to the valve plug along a longitudinal axis of the valve stem.

2. The balanced pressure regulator of claim 1 , wherein the retainer is attached to the valve stem with a fastener.

3. The balanced pressure regulator of claim 2 , wherein the central balancing passage extends through the fastener.

4. The balanced pressure regulator of claim 1 , further comprising a pressure sensing spring disposed between the retainer and the valve plug.

5. The balanced pressure regulator of claim 4 , wherein the pressure sensing spring biases the retainer away from the valve plug.

6. The balanced pressure regulator of claim 5 , wherein further comprising a plug spring seat disposed between the retainer and the valve plug.

7. The balanced pressure regulator of claim 6 , wherein the plug spring seat includes a balancing passageway.

8. The balanced pressure regulator of claim 1 , wherein the retainer includes an outwardly extending flange.

9. The balanced pressure regulator of claim 8 , wherein the outwardly extending flange includes a chamfered surface.

10. The balanced pressure regulator of claim 1 , wherein the valve plug includes a central bore having a first portion with a first diameter and a second portion having a second diameter, the first diameter being larger than the second diameter.

11. A balanced plug assembly for a balanced pressure regulator, the balanced plug assembly comprising:
a retainer operatively connecting the valve plug to a valve stem;
a diaphragm separating a chamber from the fluid passageway;
a central balancing passage that fluidly connects the fluid passageway with the chamber; and
a peripheral balancing passage that fluidly connects the fluid passageway with the chamber, the peripheral balancing passage being located between the retainer and the valve plug,
wherein the retainer is movable relative to the valve plug along a longitudinal axis of the valve stem.

12. The balanced pressure regulator of claim 11 , wherein the retainer is attached to the valve stem with a fastener.

13. The balanced pressure regulator of claim 12 , wherein the central balancing passage extends through the fastener.

14. The balanced pressure regulator of claim 11 , further comprising a pressure sensing spring disposed between the retainer and the valve plug.

15. The balanced pressure regulator of claim 14 , wherein the pressure sensing spring biases the retainer away from the valve plug.

16. The balanced pressure regulator of claim 15 , wherein further comprising a plug spring seat disposed between the retainer and the valve plug.

17. The balanced pressure regulator of claim 16 , wherein the plug spring seat includes a balancing passageway.

18. The balanced pressure regulator of claim 11 , wherein the retainer includes an outwardly extending flange.

Assignees

• Emerson Process Man Regulator Technologies Inc

Inventors

• Fan Guolei
• Zhou Biao
• Liu Nian Chun
• Zhang Jing
• He Yang
• Nguyen Tung K

Classifications

• Y10T137/7801

  Balanced valve · CPC title

• G05D16/106 Primary

  Sleeve-like sensing elements; Sensing elements surrounded by the flow path · CPC title

• G05D16/0638 Primary

  characterised by the form of the obturator · CPC title