Fluid handling – Line condition change responsive valves – Direct response valves
Patent
1982-05-17
1984-12-25
Cohan, Alan
Fluid handling
Line condition change responsive valves
Direct response valves
1375124, 137857, 251333, 267161, F16K 1516
Patent
active
044897537
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to valves, and more particularly to straightway valves.
BACKGROUND OF THE INVENTION
At present industry is in great need of for a substantial increase in the speed of piston compressors along with the retention of their high economic efficiency. Since valves are principal elements determining the resistance in the gas channel or path of the piston compressor and the losses arising therein are the most of the energy losses in the compressor, it is necessary to increase flow sections of the valves without impairing their reliability and increasing the overall dimensions.
Known in the prior art are straightway valves solving this problem, for example the straightway valve in accordance with U.S. Pat. No. 3,786,833 patented in 1974 (selected as a prototype) that comprises a housing made from interconnected stiff members, each still member having on its one side an intake channel and a seat surface arranged opposite the intake channel and a seat of another stiff member, and closing members made as toothed plates pinched between adjacent stiff members of the housing.
This straightway valve allows its flow section to be enlarged without increasing its overall dimensions since the multitooth plate has an extended length of the outlet slot.
However, the multitooth plates are complicated in production since they require a substantial complication of the dies. Furthermore, their production requires a very wide strip of thin thickness, possessing a high strength and a high elasticity. Moreover, because of anisotropy of the strip material a part of the teeth is unfavourably oriented with respect to the direction of rolling. This reduces the strength of the plates and, hence, the reliability of the valve.
In addition, microcracks are developed at the tooth edges during the die forging of the plates. This reduces the service life of the plates and, hence, of the valves as a whole.
The technique of vibration tumbling by means of an abrasive material in a rotating drum is an effective method for strengthening the plates. However, this method of strengthening is unusable for thin multitooth plates weakened by slots between the teeth.
When the pack of valve members is squeezed, small crumplings of the portion of the seat surface are formed, and a shoulder is formed along its border. This shoulder bends the plate teeth towards the limiting surface and causes gas leakages, i.e. leads to a reduction in the valve efficiency.
SUMMARY OF THE INVENTION
The principal object of the invention is to provide a straightway valve wherein the closing members are made so as to increase the efficiency thereof, to improve its reliability, and make it simple to manufacture.
With this principal object in view there is proposed a straightway valve comprising a housing made from interconnected stiff members, each having on its one side an intake channel and a surface in the form of a seat and, on its other side, a limiting surface arranged opposite the intake channel and the seat of another stiff member, and closing members made in the form of toothed plates pinched or clamped between the adjacent stiff members of the housing, wherein in accordance with the invention, each toothed plate is made as teeth secured with their roots to a backing.
The toothed plate made as teeth secured to the backing allows the reliability of the valve to be improved, because it becomes possible to expediently orient the teeth in the direction of rolling and to strengthen them later by vibration tumbling, since the teeth are manufactured separately. The separate teeth and the backing are made by means of simple punching dies. Furthermore, it is possible to unify the teeth to obtain plates of various sizes.
It is advisable to make the backings extending beyond the pinching area towards the seat in order to bias the teeth against the seat.
The backing in the form of a backing plate extending beyond the pinching area towards the seat does not allow the teeth to bend in the direction of the limiting surface, thus
REFERENCES:
patent: 1632155 (1927-06-01), Vollmann
patent: 2160401 (1939-05-01), Engleman
patent: 2680916 (1954-06-01), Smith
patent: 2985188 (1961-05-01), MacDonald
patent: 3786833 (1974-01-01), Frenkel
patent: 3823735 (1974-07-01), Frenkel
patent: 3835883 (1974-09-01), Frenkel
patent: 3896846 (1975-07-01), Zakharzhevsky
patent: 4058138 (1977-11-01), Viktorov et al.
Adams Bruce L.
Burns Robert E.
Cohan Alan
Lobato Emmanuel J.
Rivell John A.
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