# US 9,519,294 B2 · Low pressure pilot operated relief valve

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- Number: US 9,519,294 B2
- Document ID: US9519294B2
- Status: Granted
- Kind: B2
- Application number: 14/600,943
- Filed: 2015-01-20
- Published: 2015-07-23
- Granted: 2016-12-13
- Earliest claimed: 2014-01-17
- Assignees: Pentair Flow Services AG
- Applicants: Pentair Flow Services AG
- Inventors: Michael McNeely; Michael Marcellus; Stephen Simpson
- Web page: https://patentgrep.com/patent/US9519294B2

## CPC

- G05D 16/16: derived from the controlled fluid
- F16K 1/06: Special arrangements for improving the flow, e.g. special shape of passages or casings
- F16K 17/02: opening on surplus pressure on one side; closing on insufficient pressure on one side (check valves F16K15/00)
- F16K 27/02: of lift valves (for reducing the flow resistance of screw-spindle lift-valves F16K1/06)
- F16K 27/0236: {Diaphragm cut-off apparatus}
- F16K 31/1266: {one side of the diaphragm being acted upon by the circulating fluid}
- Y10T 137/7764: Choked or throttled pressure type
- G05D: SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- F16K: VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING {(devices for emptying and evacuating the excess liquid in valves or conduits F16L55/07)}
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

Embodiments of the invention provide a relief valve body arranged for connecting to a pressure vessel. The relief valve body includes an inlet configured to connect to a pressure vessel and an integrated nozzle downstream from the inlet and extending along an axis. The integrated nozzle includes a nozzle exterior surface, a nozzle bulb, and a valve seat and defines a nozzle expansion region. The relief valve body further includes a redirecting pallet, a valve interior surface having at least one ramped portion downstream from the integrated nozzle and redirecting pallet, and an outlet downstream from the at least one ramped portion.

## Claims

### Claim 1

A relief valve arranged for connecting to a pressure vessel, the relief valve body comprising:
an inlet configured to connect to a pressure vessel;
an integrated nozzle downstream from the inlet and extending along an axis, the integrated nozzle defining a nozzle expansion region and including a nozzle exterior surface, a nozzle bulb defining a substantially protrudent shape that protrudes away from the axis, and a valve seat;
a valve interior surface including a first ramped portion, a second ramped portion, a flat portion, and an arced portion, the first ramped portion expanding a fluid flow area by ramping from a ramp apex around the integrated nozzle to the flat portion and the second ramped portion expanding the fluid flow area by ramping from the ramp apex around the integrated nozzle to the flat portion on an opposite side of the integrated nozzle from the first ramped portion;
a redirecting pallet defining a curved portion and a flat portion that cooperate to direct a fluid flow towards the valve interior surface; and
an outlet downstream from the first ramped portion and the second ramped portion.

### Claim 2 (depends on 1)

The relief valve body of claim 1, wherein the nozzle expansion region defines an expansion ratio Rexp of approximately 1.8.

### Claim 3 (depends on 1)

The relief valve body of claim 1, wherein the nozzle expansion region defines an expansion ratio Rexp of between about 1.5 and about 2.1.

### Claim 4 (depends on 1)

The relief valve body of claim 1, wherein the nozzle expansion region defines a substantially frusto-conical shape.

### Claim 5 (depends on 1)

The relief valve body of claim 1, wherein the redirecting pallet defines a curved portion and a flat portion that cooperate to direct a fluid flow towards the valve interior surface.

### Claim 6 (depends on 1)

The relief valve body of claim 1, wherein the first ramped portion and the second ramped portion engage the flat portion in a plane between the outlet and the axis.

### Claim 7 (depends on 1)

The relief valve body of claim 1, wherein the first ramped portion and the second ramped portion engage the flat portion in a plane intersecting the axis.

### Claim 8 (depends on 1)

The relief valve body of claim 1, wherein the first ramped portion and the second ramped portion engage the flat portion in a plane substantially further away from the outlet than the axis.

### Claim 9 (depends on 1)

The relief valve body of claim 1, wherein the arced portion defines a decreasing flow area for a fluid flow traveling towards the outlet.