Pressure independent control valve
First Claim
1. A pressure independent fluid flow regulating valve providing a substantially constant flow rate for each position of an adjustable throttle means regardless of changes in line fluid pressure, comprising:
- a valve body having an inlet and an outlet, forming a flow passage through said valve body;
an adjustable throttle means disposed in said fluid passage to vary the open area of said fluid passage;
downstream of said throttling device a seat orifice intersecting said flow passage;
a moveable assembly, comprising a disk or cup connected to, and operated by a pressure sensing means member comprising a diaphragm;
the disk or cup is located downstream of the seat with which it interacts to vary the flow resistance;
said disk or cup has a slightly larger diameter than the opening in the seat;
the effective surface area of the disk or cup, is essentially the same as the effective surface area of said pressure sensing means;
the pressure sensing means operates inside a cylinder or chamber which it divides in two portions, one portion is connected to the outlet, the other portion via a reference pressure passage connected to a point upstream of the throttle means;
spring means biases said moveable assembly.
1 Assignment
0 Petitions
Accused Products
Abstract
Simple APCV, ADPCV and PICV'"'"'s are provided. The APCV'"'"'s are referenced to the atmosphere and control the gauge pressure, either upstream or downstream. The ADPCV'"'"'s are the same as the APCV'"'"'s, differing in that they are not referenced to the atmosphere. They are instead referenced to a second point in the fluid flow system and control the differential pressure. The PICV'"'"'s are control valves connected in series with ADPCV'"'"'s and control the fluid flow rate through the valve independently of variations in the line pressure. A preferred APCV has a valve body (1) with connections for a single-phase fluid line and a flow passage between the inlet (2) and the outlet (3) of said fluid line, with an opening having a defined seat orifice (7) intersecting the flow passage. A moveable assembly, comprising a disk (5) or cup is connected to a pressure sensing member (4), having essentially the same effective surface area. The moveable assembly, is biased by a force, and is free to automatically move to any intermediate position between fully open and closed, producing a desired outlet pressure which minus the reference pressure, times the effective surface area of the disk or cup generates an opposing force equal to the biasing force.
-
Citations
39 Claims
-
1. A pressure independent fluid flow regulating valve providing a substantially constant flow rate for each position of an adjustable throttle means regardless of changes in line fluid pressure, comprising:
-
a valve body having an inlet and an outlet, forming a flow passage through said valve body;
an adjustable throttle means disposed in said fluid passage to vary the open area of said fluid passage;
downstream of said throttling device a seat orifice intersecting said flow passage;
a moveable assembly, comprising a disk or cup connected to, and operated by a pressure sensing means member comprising a diaphragm;
the disk or cup is located downstream of the seat with which it interacts to vary the flow resistance;
said disk or cup has a slightly larger diameter than the opening in the seat;
the effective surface area of the disk or cup, is essentially the same as the effective surface area of said pressure sensing means;
the pressure sensing means operates inside a cylinder or chamber which it divides in two portions, one portion is connected to the outlet, the other portion via a reference pressure passage connected to a point upstream of the throttle means;
spring means biases said moveable assembly. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 22, 23)
-
-
21. A pressure independent fluid flow regulating valve providing a substantially constant flow rate for each position of an adjustable throttle means regardless of changes in line fluid pressure, comprising:
-
a valve body having an inlet and an outlet, forming a flow passage through said valve body;
an adjustable throttle means disposed in said fluid passage to vary the open area of said fluid passage;
upstream of said throttling device a seat orifice intersecting said flow passage, a moveable assembly, comprising a disk or cup connected to, and operated by a pressure sensing means;
the disk or cup is located downstream of the seat with which it interacts to vary the flow resistance;
said disk or cup has a slightly larger diameter than the opening in the seat;
the disk or cup is joined with the pressure sensing means with a stem;
the effective surface area of the cup or disk, is essentially the same as the effective surface area of said pressure sensing means;
the pressure sensing means operates inside a cylinder or chamber which it divides in two portions, one portion is connected to the inlet, the other portion via a reference pressure passage connected to a point downstream of the throttle means;
spring means biases said moveable assembly. - View Dependent Claims (24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39)
-
Specification