US3726301A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pilot valve
Assignee: LONERGAN J CO
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Filing: 1970-12-21
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Granted: 1973-04-10
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Expires: 1990-12-21
Abstract
Abstract A pilot valve in which the control port is connected alternatively to a pressure port and a vent port, including two valve seats and interconnected valve elements cooperating with the seats. The structure of the valve seats forms a pressurebuilding chamber upon initial movement of the valve elements in which the pressure fluid is trapped to generate a pressure on the interconnected valve elements tending to displace said elements abruptly toward their limit positions. This abrupt action is provided at one seat by a ported rod interconnecting the valve elements and providing a restriction in the flow passage between the pressure port and the pressure chamber which enables build-up of pressure in the chamber upon initial movement of the valve elements toward the position disconnecting the vent port and connecting the pressure port.
Inventors
- 👤 A Schmidt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 17:12
CPC Classifications
F; F16; F16K; F16K17/00; F16K17/02; F16K17/04; F16K17/10; F16K17/105; Y; Y10; Y10T; Y10T137/00; Y10T137/2496; Y10T137/2544; Y10T137/2559; Y10T137/2574; Y10T137/2605; Y10T137/2635; Y10T137/7722; Y10T137/7738; Y10T137/7758; Y10T137/7762; Y10T137/7769
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
341 words
In a pilot valve having a control port, a vent port, and a pressure port, a venting valve element displaceable between open and closed limit positions intermediate said control port and said vent port, a pressure valve element displaceable between open and closed limit positions between said control port and said pressure port, and means ganging said valve elements for cooperative displacement whereby said control port is alternatively connected to said pressure port and said vent port, depending upon the pressure in said pressure port, said pilot valve including a valve throat extending from said control port and terminating at its remote end in a pressure valve seat cooperable with said pressure valve element, the pressure in said pressure port operable on said pressure valve element and tending to displace said element toward its closed limit position in engagement with said pressure seat, said ganged valve elements having a bias tending to displace said pressure valve element away from its seat, the pressure fluid in said pressure port operable to overcome said bias and displace said pressure valve element onto said pressure seat when its pressure exceeds the blow-off pressure, said pressure valve element operable to be displaced from its seat when the pressure of the fluid in said pressure port falls below the blow-down pressure; the improvement wherein said throat includes a pressure-building chamber adjacent said seat, and valving means preventing substantial flow of pressure fluid from said pressure-building chamber through said throat to said control upon initial opening of said pressure valve element by displacement of said pressure valve element from its seat, pressure fluid from said pressure port being accommodated iN said pressure-building chamber to augment said bias and insure prompt and positive displacement of said pressure valve element away from said seat to its open limit position upon reduction of the pressure in said pressure port to blow down pressure, said valving means including passage means operable upon further displacement of said pressure valve element to afford free flow between said pressure-building chamber and said control port.
Claim 2
Dependent Claim
341 words
In a pilot valve having a control port, a vent port, and a pressure port, a venting valve element displaceable between open and closed limit positions intermediate said control port and said vent port, a pressure valve element displaceable between open and closed limit positions between said control port and said pressure port, and means ganging said valve elements for cooperative displacement whereby said control port is alternatively connected to said pressure port and said vent port, depending upon the pressure in said pressure port, said pilot valve including a valve throat extending from said control port and terminating at its remote end in a pressure valve seat cooperable with said pressure valve element, the pressure in said pressure port operable on said pressure valve element and tending to displace said element toward its closed limit position in engagement with said pressure seat, said ganged valve elements having a bias tending to displace said pressure valve element away from its seat, the pressure fluid in said pressure port operable to overcome said bias and displace said pressure valve element onto said pressure seat when its pressure exceeds the blow-off pressure, said pressure valve element operable to be displaced from its seat when the pressure of the fluid in said pressure port falls below the blow-down pressure; the improvement wherein said throat includes a pressure-building chamber adjacent said seat, and valving means preventing substantial flow of pressure fluid from said pressure-building chamber through said throat to said control upon initial opening of said pressure valve element by displacement of said pressure valve element from its seat, pressure fluid from said pressure port being accommodated iN said pressure-building chamber to augment said bias and insure prompt and positive displacement of said pressure valve element away from said seat to its open limit position upon reduction of the pressure in said pressure port to blow down pressure, said valving means including passage means operable upon further displacement of said pressure valve element to afford free flow between said pressure-building chamber and said control port.
Claim 3
Dependent Claim
100 words
A valve according to claim 1 wherein the ganged valve elements include a rod element extending through said throat and engaging said pressure valve element, said rod having a ported axial bore comprising valving means intermediate said pressure-building chamber and the control port, said rod being in sliding engagement with said throat to limit flow therethrough, and said ported bore in said rod being closed when said pressure valve element is initially displaced from its seat, and operable to be opened after substantial displacement of said pressure valve element from its seat to afford said free flow through said throat.
Claim 4
Dependent Claim
71 words
Apparatus according to claim 2 including lateral ports spaced along said axial bore, the innermost of said ports being in constant communication with said control port and the outermost of said ports being closed by said throat both when said pressure valve element is seated and when said element is initially displaced, and being open to said pressure-building chamber after said substantial displacement of said pressure valve element from its seat.
Claim 5
Dependent Claim
128 words
Apparatus according to claim 3 wherein said valve includes a venting throat in longitudinal alignment with said pressure throat and terminating at its remote end in a venting seat cooperable with said venting valve element, said rod extending through said throats and being slidably engaged in said venting valve element, said pilot valve including a venting pressure chamber surrounding said venting seat and slidably receiving said venting valve element therein, said venting pressure chamber being connected to said vent port by a restricted flow passage, whereby upon initial opening of said venting valve element, pressure fluid flowing through its seat into said venting pressure chamber operates to slidably displace said venting valve element in said venting pressure chamber, insuring prompt and positive opening of said venting valve element.
Claim 6
Dependent Claim
81 words
Apparatus according to claim 2 wherein said pressure valve element comprises a spherical member, one end of said axial bore of said rod being open and cooperable with said spherical element to be closed thereby when in engagement therewith, said valve seat being of circular form of greater diameter than said rod so as to cooperate with said pressure valve element, said pressure-building chamber adjacent said seat being formed by a recessed portion of said valve throat immediately adjacent said seat.
Claim 7
Dependent Claim
29 words
Apparatus according to claim 5 wherein said spherical valve element is free for movement in response to either pressure in said pressure port or the bias of said rod.
Claim 8
Dependent Claim
44 words
Apparatus according to claim 2 wherein the bias of said ganged valve elements is provided by a spring, and the aforesaid pressure valve seat is adjustable to regulate the displacement of said valve spring and thus the blow-down pressure relative to the blow-off pressure.
Claim 9
Dependent Claim
227 words
A positive-action valve having a control port and a pressure port, the valve being responsive to the pressure in said pressure port, a valve throat open at one end to said control port and terminating at the other end in a valve seat, a valve element cooperable with said seat, means biasing said valve element away from said seat against the pressure of the fluid in said pressure port to open said valve when the pressure in said pressure port falls below a blow-down level, said means including a rod slidable in said throat and engaging said valve element, said rod including a length having a sliding fit in the throat restricting flow of fluid therethrough, passage means bypasSing said length and affording free flow of fluid between said seat and said control port, means closing said passage means during initial displacement of said valve element from its seat and opening said passage means after displacement of said valve element from said seat a substantial distance, said seat being provided with a recess surrounding said rod in said throat cooperable with said valve element to constitute a pressure-building chamber in which pressure fluid may be received upon initial displacement of said valve element from said seat, the fluid in said chamber supplementing the bias of said rod to positively displace said valve element away from said seat.
Claim 10
Dependent Claim
227 words
A positive-action valve having a control port and a pressure port, the valve being responsive to the pressure in said pressure port, a valve throat open at one end to said control port and terminating at the other end in a valve seat, a valve element cooperable with said seat, means biasing said valve element away from said seat against the pressure of the fluid in said pressure port to open said valve when the pressure in said pressure port falls below a blow-down level, said means including a rod slidable in said throat and engaging said valve element, said rod including a length having a sliding fit in the throat restricting flow of fluid therethrough, passage means bypasSing said length and affording free flow of fluid between said seat and said control port, means closing said passage means during initial displacement of said valve element from its seat and opening said passage means after displacement of said valve element from said seat a substantial distance, said seat being provided with a recess surrounding said rod in said throat cooperable with said valve element to constitute a pressure-building chamber in which pressure fluid may be received upon initial displacement of said valve element from said seat, the fluid in said chamber supplementing the bias of said rod to positively displace said valve element away from said seat.
Claim 11
Dependent Claim
52 words
A valve according to claim 8 wherein said valve element comprises said means to maintain said passage means closed when said valve is closed and during initial displacement of said valve from said seat, and to open said passage means after displacement of said valve element a substantial distance from its seat.
Claim 12
Dependent Claim
74 words
A valve according to claim 8 wherein said passage means comprises an axial bore in said rod, one end of said bore being open to said control port and the other end of said bore engaging said valve element to be closed thereby when said valve element is seated on said seat, said rod being displaceable with said valve element during initial displacement of said valve from said seat to maintain said bore closed.
Claim 13
Dependent Claim
61 words
A valve according to claim 10 including a port in said bore which is positioned to be closed by a sliding fit in said throat when said valve element is seated and to be open to said pressure-building chamber after substantial displacement of said valve element from its seat to thereby open said bore to the flow of pressure fluid therethrough.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-04-09 | 1976-10-09 | 1977-04-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-09 | 1980-10-09 | 1981-04-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-09 | 1984-10-09 | 1985-04-10 | $7700.00 | Window Closed / Lapsed |