Valves and valve actuation – Electrically actuated valve – Including solenoid
Patent
1998-12-14
2000-09-12
Shaver, Kevin
Valves and valve actuation
Electrically actuated valve
Including solenoid
25112918, F16K 3102
Patent
active
061165719
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a direct-acting, pressure-balanced linear valve with a hollow, displaceable sealing tube.
In known linear valves of this type, a direct-acting magnetic drive or a piston drive actuated by a separate medium is arranged rotational-symmetrically around the sealing tube displaceable in the medium. Because of the rotational-symmetrical arrangement, an individual electric or pneumatic drive unit is required for each rated width. For the purpose of maintenance or repair of the drive unit, the linear valve must be completely removed from the media circuit in order to be able to replace the electric and the piston drive, respectively. Maintenance or repair of the drive unit of a linear valve therefore entails long downtimes of the entire installation.
The invention provides a linear valve in which the magnetic, pneumatic or electromotive drive component is arranged outside the media flow and provides a transmission, in particular by means of levers or toggle joints, which makes it possible to manage with lower electric or pneumatically produced drive forces. One drive component can therefore be used for several rated widths. Furthermore, the drive unit can be exchanged or replaced in a short time without having to interfere with the fluidic part of the linear valve. For example, manually operated, electromagnetic, pneumatic or electromotive drive modules may be attached. In accordance with the invention it becomes furthermore possible to change the valve function from no-current
o-pressure closed to no-current
o-pressure open electro-pneumatically in the pipe network.
It has proved particularly useful that the fluidic housing of the linear valve is provided at its underside with a drainage bore passing through to the outside, which, for example, enables any leakage of the seal to be seen directly. Furthermore, different sensor elements can be connected to this drainage bore, for purposes including position acknowledgement of the sealing tube, as well as leakage or flow indications.
In a preferred embodiment for linear valves with small rated widths from 4 to 10 mm, the drive unit is provided with a hinged armature which is preferably flanged to one side of the fluid housing and radially next to it and which by means of an extension lever provided with a toothed segment engages with the sealing tube with an interlocking fit. By reason of the proposed arrangement, the drive unit can be removed in a simple manner without interference with the fluid section.
The arrangement of the linear drive furthermore takes into account that between the fluid space of the linear valve and the armature space of the magnet there is an intermediate space, separated by seals and open to the outside, which prevents the entry of the medium into the armature space in case of leakage of one of the two groove and lip seals. This provision is especially advantageous with linear valves which are used for directing fluids, in particular linear valves employed for aggressive media, whereby the drive is preferably arranged above the fluid housing, for additional protection of the armature space.
With the linear valve according to the invention it becomes possible to keep the sliding force for the sealing tube low. To this purpose, the counteracting forces produced by the differential surfaces are to be minimized. According to the invention, this is achieved in that the sealing tube is embodied as a very thin-walled metal or plastic tube to which the seat is turned on.
A further improvement in minimizing the sliding forces is achieved by the use of lip seals for the seal sections on the sealing tube which for this purpose will be provided with a predetermined profile and inserted in an optimized way.
The reduction of the frictional forces at the seals and at the differential surface of the sealing tube to a minimum has the great advantage, as compared with known conventional embodiments, that equally high fluidic throughputs can be managed with smaller driving powers, which means smaller electromagnetic motorized or pis
REFERENCES:
patent: 2675508 (1954-08-01), Ray
patent: 3532121 (1970-10-01), Sturman
patent: 3570807 (1971-03-01), Sturman
patent: 3784156 (1974-01-01), Paetzel et al.
patent: 4285497 (1981-08-01), Guttel
Bonderer D A
Burkert Werke GmbH & Co.
Friedman, Esq. Stuart J.
Shaver Kevin
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