US3626474A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressure indicator and bypass pressure relief valve
Assignee: Purolator Courier Corp
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Filing: 1969-11-13
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Granted: 1971-12-07
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Expires: 1989-11-13
Abstract
Abstract An indicator and bypass pressure relief device for use in a system having a high-pressure side and a low-pressure side, which indicates or signals an increase of pressure in the high-pressure side of the system beyond a predetermined differential limit; and bypasses fluid from the high-pressure side to the low-pressure side of the system to relieve such high pressure whenever it exceeds a predetermined differential pressure limit.
Inventors
- 👤 Kurt F Hammer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:53
CPC Classifications
F; F16; F16K; F16K47/00; B; B01; B01D; B01D35/00; B01D35/14; B01D35/143; B01D35/147; F16K17/00; F16K17/02; F16K17/04; F16K37/00; F16K37/0025; F16K37/0033; F16K37/0041; Y; Y10; Y10T; Y10T137/00; Y10T137/8158; Y10T137/8225; Y10T137/8242
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
176 words
A pressure indicator and bypass pressure relief device for use in a system having a high-pressure side and a low-pressure side, the combination including: a. a movable piston exposed on one side to high pressure and on the other side to low pressure, said piston being movable whenever differential pressure exceeds a predetermined minimum; b. means for indicating a predetermined increase in differential pressure between the high pressure side and the low-pressure side of the system; c. means for operating said indicator means carried by said piston and exposed directly to high pressure on the highpressure side of said piston, said indicator operating means being movable independent of said piston to actuate said indicator means upon a predetermined increase in differential pressure; and d. means interconnecting said high-pressure side of said piston with the low-pressure side of the system for relieving pressure on said high-pressure side of said piston when the differential between high pressure and low pressure exceeds a second predetermined limit, said means being in cooperative communication with and operable by said movable piston.
Claim 2
Dependent Claim
176 words
A pressure indicator and bypass pressure relief device for use in a system having a high-pressure side and a low-pressure side, the combination including: a. a movable piston exposed on one side to high pressure and on the other side to low pressure, said piston being movable whenever differential pressure exceeds a predetermined minimum; b. means for indicating a predetermined increase in differential pressure between the high pressure side and the low-pressure side of the system; c. means for operating said indicator means carried by said piston and exposed directly to high pressure on the highpressure side of said piston, said indicator operating means being movable independent of said piston to actuate said indicator means upon a predetermined increase in differential pressure; and d. means interconnecting said high-pressure side of said piston with the low-pressure side of the system for relieving pressure on said high-pressure side of said piston when the differential between high pressure and low pressure exceeds a second predetermined limit, said means being in cooperative communication with and operable by said movable piston.
Claim 3
Dependent Claim
20 words
a bleed means adjacent said seat and in communication with a low-pressure zone in said chamber in said body; and
Claim 4
Dependent Claim
20 words
a bleed means adjacent said seat and in communication with a low-pressure zone in said chamber in said body; and
Claim 5
Dependent Claim
165 words
A pressure indicator and bypass pressure relief device for use in a system having a high-pressure side and a low-pressure side, the combination including: a. a movable piston exposed on one side to high pressure and on the other side to low pressure, said piston being movable whenever differential pressure exceeds a predetermined minimum; b. means for indicating a predetermined increase in differential pressure between the high-pressure side and the low-pressure side of the system; c. means for operating said indicator means, said means comprising a movable differential pressure-responsive element carried in said piston and having a portion exposed directly to the high pressure on the high-pressure side of said piston; and d. means interconnecting said high-pressure side of said piston with the low-pressure side of the system for relieving pressure on said high-pressure side of said piston when the differential between high pressure and low pressure exceeds a second predetermined limit, said means being in cooperative communication with and operable by said movable piston.
Claim 6
Dependent Claim
165 words
A pressure indicator and bypass pressure relief device for use in a system having a high-pressure side and a low-pressure side, the combination including: a. a movable piston exposed on one side to high pressure and on the other side to low pressure, said piston being movable whenever differential pressure exceeds a predetermined minimum; b. means for indicating a predetermined increase in differential pressure between the high-pressure side and the low-pressure side of the system; c. means for operating said indicator means, said means comprising a movable differential pressure-responsive element carried in said piston and having a portion exposed directly to the high pressure on the high-pressure side of said piston; and d. means interconnecting said high-pressure side of said piston with the low-pressure side of the system for relieving pressure on said high-pressure side of said piston when the differential between high pressure and low pressure exceeds a second predetermined limit, said means being in cooperative communication with and operable by said movable piston.
Claim 7
Dependent Claim
170 words
A pressure indicator and bypass and a pressure relief device, the combination including: a. a body having a chamber which has a high-pressure inlet and a low-pressure outlet; b. pressure responsive means in said chamber exposed to high pressure on one side and low pressure on the other side; c. means for indicating an increase in differential pressure between said high-pressure side and said low-pressure side; d. means for operating said indicator means movably carried by said pressure-responsive means, said indicator-operating means being movable by an increase in pressure on said high-pressure side of said pressure-responsive means into a position to actuate said indicator means; and e. means interconnecting the high-pressure side and the low-pressure side of said pressure-responsive means for relieving high pressure on said high-pressure side, said means being operable by said pressure-responsive means as a result of a further increase in pressure on said high-pressure side of said pressure-responsive means over and above that necessary to move said indicator-operating means into position to actuate said indicator means.
Claim 8
Dependent Claim
170 words
A pressure indicator and bypass and a pressure relief device, the combination including: a. a body having a chamber which has a high-pressure inlet and a low-pressure outlet; b. pressure responsive means in said chamber exposed to high pressure on one side and low pressure on the other side; c. means for indicating an increase in differential pressure between said high-pressure side and said low-pressure side; d. means for operating said indicator means movably carried by said pressure-responsive means, said indicator-operating means being movable by an increase in pressure on said high-pressure side of said pressure-responsive means into a position to actuate said indicator means; and e. means interconnecting the high-pressure side and the low-pressure side of said pressure-responsive means for relieving high pressure on said high-pressure side, said means being operable by said pressure-responsive means as a result of a further increase in pressure on said high-pressure side of said pressure-responsive means over and above that necessary to move said indicator-operating means into position to actuate said indicator means.
Claim 9
Dependent Claim
134 words
a high-pressure relief port means in said cylinder communicating with a low-pressure zone in said chamber, said relief port being spaced a further distance from said seat then said bleed means; c. a piston means movable in said cylinder, said piston being adapted to sealably engage said seat in said cylinder and to operate said high-pressure relief port means as the result of an increase in differential pressure between said high pressure and said low-pressure side of said cylinder; d. means for indicating an increase in differential pressure between said high-pressure side and said low-pressure side; and e. means for operating said indicator means carried by said piston, said indicator operating means being movable by an increase in pressure on said high-pressure side of said cylinder into a position to actuate said indicator means.
Claim 10
Dependent Claim
134 words
a high-pressure relief port means in said cylinder communicating with a low-pressure zone in said chamber, said relief port being spaced a further distance from said seat then said bleed means; c. a piston means movable in said cylinder, said piston being adapted to sealably engage said seat in said cylinder and to operate said high-pressure relief port means as the result of an increase in differential pressure between said high pressure and said low-pressure side of said cylinder; d. means for indicating an increase in differential pressure between said high-pressure side and said low-pressure side; and e. means for operating said indicator means carried by said piston, said indicator operating means being movable by an increase in pressure on said high-pressure side of said cylinder into a position to actuate said indicator means.
Claim 11
Dependent Claim
65 words
A combination as defined in claim 3 in which a first increase in differential pressure will cause movement of said pressure-responsive means to move said indicator-operating means into a position to actuate said indicator means and in which a higher differential pressure will move said pressure responsive means into bypass pressure relief position to open a bypass and relieve the pressure on said high-pressure side.
Claim 12
Dependent Claim
27 words
A combination as defined in claim 3 in which said indicator means indicates high-pressure surges on said high-pressure side without the opening of said high-pressure relief means.
Claim 13
Dependent Claim
51 words
A pressure indicator and bypass and a pressure relief device, the combination including: a. a body having a chamber which has a high-pressure inlet and a low-pressure outlet; b. a cylinder in said chamber exposed to high pressure on one side and low pressure on the other side, said cylinder having:
Claim 14
Dependent Claim
51 words
A pressure indicator and bypass and a pressure relief device, the combination including: a. a body having a chamber which has a high-pressure inlet and a low-pressure outlet; b. a cylinder in said chamber exposed to high pressure on one side and low pressure on the other side, said cylinder having:
References Cited (Backward Citations)
US2998138A
Cited
US3128743A
Cited
US3150633A
Cited
US3420266A
Cited
US3364897A
Cited
US3371787A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-12-06 | 1975-06-07 | 1975-12-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-06 | 1979-06-07 | 1979-12-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-06 | 1983-06-07 | 1983-12-07 | $7700.00 | Window Closed / Lapsed |