US4076210A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic valve
Assignee: SMS Siemag AG
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Filing: 1975-02-27
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Granted: 1978-02-28
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Expires: 1995-02-27
Abstract
Abstract A hydraulic valve has a valve member whose travel is limited at one end by an abutment. The abutment is part of a hydraulic piston-cylinder arrangement, and when the piston-cylinder arrangement is pressurized and the valve member is moved to the end of its travel, the abutment is held in a first position where the valve is only open to a small extent. If the piston-cylinder arrangement is then pressure-relieved, the force moving the valve member against the abutment displaces the abutment so that the valve can open further.
Inventors
- 👤 Harry Spielvogel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 05:08
CPC Classifications
F; F16; F16K; F16K1/00; F16K1/32; F16K1/52; F16K3/00; F16K3/30; F16K3/32
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
166 words
A hydraulic valve comprising: housing means; a valve member axially movable within said housing means; a cylinder formed in said housing means; a first hydraulically actuated stepped piston slidable in said cylinder, said piston having a shank with a threaded bore, said shank further including an outer threaded portion which extends out of said cylinder; lock nuts, engageable with said outer threaded portion of said shank, for adjusting the travel of said first piston in said cylinder; a threaded piston rod, threadably received into said threaded bore of said first piston shank, forming a stop abutment for limiting axial movement of said valve member, said threaded rod axially adjustable in said first piston; and means for positively biasing said valve member against said stop abutment when said valve member is open, said means for positively biasing said valve member comprising a hydraulic biasing piston for biasing the valve member towards the stop abutment, and spring means for biasing the valve member away from said stop abutment.
Claim 2
Dependent Claim
166 words
A hydraulic valve comprising: housing means; a valve member axially movable within said housing means; a cylinder formed in said housing means; a first hydraulically actuated stepped piston slidable in said cylinder, said piston having a shank with a threaded bore, said shank further including an outer threaded portion which extends out of said cylinder; lock nuts, engageable with said outer threaded portion of said shank, for adjusting the travel of said first piston in said cylinder; a threaded piston rod, threadably received into said threaded bore of said first piston shank, forming a stop abutment for limiting axial movement of said valve member, said threaded rod axially adjustable in said first piston; and means for positively biasing said valve member against said stop abutment when said valve member is open, said means for positively biasing said valve member comprising a hydraulic biasing piston for biasing the valve member towards the stop abutment, and spring means for biasing the valve member away from said stop abutment.
Claim 3
Dependent Claim
28 words
The hydraulic valve of 1 wherein the largest piston face area of said hydraulic biasing piston is smaller than the smallest piston face area of said first piston.
Claim 4
Dependent Claim
28 words
The hydraulic valve of 1 wherein the largest piston face area of said hydraulic biasing piston is smaller than the smallest piston face area of said first piston.
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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) | 1981-02-27 | 1981-08-29 | 1982-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-02-27 | 1985-08-29 | 1986-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-02-27 | 1989-08-29 | 1990-02-28 | $7700.00 | Window Closed / Lapsed |