Cascade trim for control valve
First Claim
1. A cascade trim for a fluid control valve, the cascade trim comprising:
- a valve cage defining a valve inlet and a valve outlet; and
a valve stem reciprocally moveable within the valve cage, the valve cage and valve stem collectively defining a first fluid passageway column and a second fluid passageway column, each of the first and second fluid passageway columns extending at least partially through the valve cage and the valve stem between the valve inlet and the valve outlet;
the valve stem being moveable between;
a closed position relative to the valve cage, wherein both the first and second fluid passageway columns are closed to prevent fluid from flowing between the valve inlet and valve outlet through the first and second fluid passageway columns;
a first passageway position wherein the first fluid passageway column is open and the second fluid passageway column is closed to allow fluid to flow between the valve inlet and valve outlet through the first fluid passageway column; and
a second passageway position wherein the second fluid passageway column is open and the first fluid passageway column is closed to allow fluid to flow between the valve inlet and valve outlet through the second fluid passageway column.
1 Assignment
0 Petitions
Accused Products
Abstract
A cascade type trim for integration into control valve and having a valve stem and a valve cage which cooperate with each other to define a plurality of fluid passageway columns, each of which extend between a valve inlet and a valve outlet. Each fluid passageway column is collectively defined by a plurality of stem passageways and a plurality of cage passageways. The stem and cage passageways are brought in and out of alignment as a result of axial movement of the stem relative to the cage. In a first position, a first fluid passageway is open, while a second fluid passageway remains closed. In a second position, both the first and second fluid passageways are open, and yet in a third position, the first fluid passageway is closed and the second fluid passageway is open.
56 Citations
20 Claims
-
1. A cascade trim for a fluid control valve, the cascade trim comprising:
-
a valve cage defining a valve inlet and a valve outlet; and a valve stem reciprocally moveable within the valve cage, the valve cage and valve stem collectively defining a first fluid passageway column and a second fluid passageway column, each of the first and second fluid passageway columns extending at least partially through the valve cage and the valve stem between the valve inlet and the valve outlet; the valve stem being moveable between; a closed position relative to the valve cage, wherein both the first and second fluid passageway columns are closed to prevent fluid from flowing between the valve inlet and valve outlet through the first and second fluid passageway columns; a first passageway position wherein the first fluid passageway column is open and the second fluid passageway column is closed to allow fluid to flow between the valve inlet and valve outlet through the first fluid passageway column; and a second passageway position wherein the second fluid passageway column is open and the first fluid passageway column is closed to allow fluid to flow between the valve inlet and valve outlet through the second fluid passageway column. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
-
-
12. A cascade trim for a fluid control valve, the cascade trim comprising:
-
a valve cage defining a valve inlet and a valve outlet; and a valve stem reciprocally moveable within the valve cage, the valve cage and valve stem each being configured to collectively define a first fluid passageway column and a second fluid passageway column, each of the first and second fluid passageway columns extending between the valve inlet and the valve outlet; wherein reciprocal movement of the valve stem relative to the valve cage causes selective constitution and division of both the first fluid passageway column and the second fluid passageway column. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
-
Specification