US 4,265,267 AGranted

Flow control device for use with positive displacement pump

OwnerIvan J. Cyphellyinventor

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Abstract

To control the flow of fluid from a positive displacement pump to a consumer line, a rotating shutter periodically opens return flow nozzles which permit the pressure-free return of the pumped fluid to a fluid reservoir. In order to provide hydraulic balancing of the forces on the shutter, the return flow nozzles are disposed symmetrically with respect to the axis of the rotating shutter. Pressure peaks which occur when the return flow nozzles are closed cause undesirable noise generation and these pressure peaks are reduced by the disposition of separate check valves associated with each of the symmetric flow conduits. The use of separate check valves reduces the length of the fluid column which must be accelerated upon nozzle closure. To reduce the opening stroke of the check valve, the edge of the valve seat meanders thereby extending its effective length. Axial play of the rotating shutter is controlled by the disposition of a spring loaded glide block.

Claims13

Dependent claims

A flow control device for use in a system having an inlet line from a positive displacement fluid pump, a first outlet line directed to a load and a second outlet line directed to a zero pressure pump reservoir, comprising:

a fixed valve housing having a main bore therein, said bore communicating with the second outlet line;
two nozzles passing through said valve housing and extending into opposite sides of said bore, the openings of said nozzles being directed into said bore diametrically toward one another;
first conduit means in said valve housing for directing fluid from the inlet line to each of said nozzles;
rotary shutter means coaxially positioned within said bore for periodically and alternately, as said rotary shutter means continuously rotates, closing both of said nozzles, simultaneously, and opening said nozzles to allow flow into the second outlet line, whereby the necessity for a sealing relationship of said rotary shutter means with said valve housing is eliminated, said rotary shutter means comprising a drive shaft and two shutters thereon positioned to simultaneously close and open said nozzles, and including an axial bearing assembly for holding said shaft in coaxial alignment with said bore;
second conduit means for directing fluid from each of said first conduit means to the first outlet line;
and
check valve means permitting flow from the inlet line into the first outlet line only when said nozzles are closed, said check valve means including a valve seat having the shape of a protruding ring presenting an annular front surface, the inner and outer edges of said annular front surface being configured to meander about a circle in parallel relationship, thereby increasing the effective valve seat length and decreasing the effective valve seat width.

4 more elements

a fixed valve housing having a main bore therein, said bore communicating with the second outlet line;
two nozzles passing through said valve housing and extending into opposite sides of said bore, the openings of said nozzles being directed into said bore diametrically toward one another;
first conduit means in said valve housing for directing fluid from the inlet line to each of said nozzles;
rotary shutter means coaxially positioned within said bore for periodically and alternately, as said rotary shutter means continuously rotates, closing both of said nozzles, simultaneously, and opening said nozzles to allow flow into the second outlet line, whereby the necessity for a sealing relationship of said rotary shutter means with said valve housing is eliminated, said rotary shutter means comprising a drive shaft and two shutters thereon positioned to simultaneously close and open said nozzles, and including an axial bearing assembly for holding said shaft in coaxial alignment with said bore, wherein said shutters of said rotary shutter means are positioned axially slidable on and keyed to said drive shaft held by said axial bearing assembly to allow axial as well as rotative movement of said shutters relative to and with said drive shaft, said shutters being urged by a spring disposed in said drive shaft against a non-rotating axially movable piston, said piston being actuated by a differential pressure upstream and downstream of a restriction positioned in the first outlet line directed to the load;
second conduit means for directing fluid from each of said first conduit means to the first outlet line;
and
check valve means permitting flow from the inlet line into the first outlet line only when said nozzles are closed.

4 more elements

a fixed valve housing having a main bore therein, said bore communicating with the second outlet line;
two nozzles passing through said valve housing and extending into opposite sides of said bore, the openings of said nozzles being directed into said bore diametrically toward one another;
first conduit means in said valve housing for directing fluid from the inlet line to each of said nozzles;
rotary shutter means coaxially positioned within said bore for periodically and alternately, as said rotary shutter means continuously rotates, closing both of said nozzles, simultaneously, and opening said nozzles to allow flow into the second outlet line, whereby the necessity for a sealing relationship of said rotary shutter means with said valve housing is eliminated, said rotary shutter means comprising a drive shaft and two shutters thereon positioned to simultaneously close and open said nozzles, and including an axial bearing assembly for holding said shaft in coaxial alignment with said bore;
second conduit means for directing fluid from each of said first conduit means to the first outlet line;
and
two identical check valve means, each being disposed between one of said first conduit means and said second conduit means, for permitting flow from the inlet line into the first outlet line only when said nozzles are closed, for independent prevention of return flow through each of said second conduit means, and for maintaining substantially at a minimum the length of fluid columns between each of said check valves and said nozzle openings and said first conduit means, wherein each of said check valve means includes a valve seat having the shape of a protruding ring presenting an annular front surface, the inner and outer edges of said annular front surface being configured to meander about a circle in parallel relationship, thereby increasing the effective valve seat length and decreasing the effective valve seat width.

4 more elements

a fixed valve housing having a main bore therein, said bore communicating with the second outlet line;
two nozzles passing through said valve housing and extending into opposite sides of said bore, the openings of said nozzles being directed into said bore diametrically toward one another;
first conduit means in said valve housing for directing fluid from the inlet line to each of said nozzles;
rotary shutter means coaxially positioned within said bore for periodically and alternately, as said rotary shutter means continuously rotates, closing both of said nozzles, simultaneously, and opening said nozzles to allow flow into the second outlet line, whereby the necessity for a sealing relationship of said rotary shutter means with said valve housing is eliminated, said rotary shutter means comprising a drive shaft and two shutters thereon positioned to simultaneously close and open said nozzles, and including an axial bearing assembly for holding said shaft in coaxial alignment with said bore, wherein said shutters of said rotary shutter means are positioned axially slidable on and keyed to said drive shaft held by said axial bearing assembly to allow axial as well as rotative movement of said shutters relative to and with said drive shaft, said shutter being urged by a spring disposed in said drive shaft against a non-rotating axially movable piston 32, said piston being actuated by a differential pressure upstream and downstream of a restriction positioned in the first outlet line directed to the load;
second conduit means for directing fluid from each of said first conduit means to the first outlet line;
and
two identical check valve means, each being disposed between one of said first conduit means and said second conduit means, for permitting flow from the inlet line into the first outlet line only when said nozzles are closed, for independent prevention of return flow through each of said second conduit means, and for maintaining substantially at a minimum the length of fluid columns between each of said check valves and said nozzle openings and said first conduit means.

4 more elements

a fixed valve housing having a main bore therein, said bore communicating with the second outlet line;
two nozzles passing through said valve housing and extending into opposite sides of said bore, the openings of said nozzles being directed into said bore diametrically toward one another;
first conduit means in said valve housing for directing fluid from the inlet line to each of said nozzles;
rotary shutter means coaxially positioned within said bore for periodically and alternately, as said rotary shutter means continuously rotates, closing both of said nozzles, simultaneously, and opening said nozzles to allow flow into the second outlet line, whereby the necessity for a sealing relationship of said rotary shutter means with said valve housing is eliminated, said rotary shutter means comprising a drive shaft and two shutters thereon positioned to simultaneously close and open said nozzles, and including an axial bearing assembly for holding said shaft in coaxial alignment with said bore;
second conduit means for directing fluid from each of said first conduit means to the first outlet line;
two identical check valve means, each being disposed between one of said first conduit means and said second conduit means, for permitting flow from the inlet line into the first outlet line only when said nozzles are closed, for independent prevention of return flow through each of said second conduit means, and for maintaining substantially at a minimum the length of fluid columns between each of said check valves and said nozzle openings and said first conduit means;
two nozzle blocks, each of said nozzle blocks being disposed on said valve housing and having a chamber section with a chamber therein and a nozzle section depending from said chamber section and passing through said valve housing, said nozzle section having one of said nozzles at one end thereof, said nozzle connecting to a nozzle bore extending axially from said nozzle into said chamber, each of said first conduits terminating in a respective one of said nozzle bores, wherein one of said second conduit means is disposed at least partially in each said nozzle block, communicating with the chamber thereof, and one of said check valve means is disposed in the chamber of each said nozzle block, the terminus of each said nozzle bore serving as the valve seat for each said check valve means;
and
a demountable cap connected to each of said nozzle blocks, and closing the chamber thereof,for defining the operating position of each said check valve means.

6 more elements

Dependencies are inferred from the claim text.

Facts

Application: 05/935,913Filed 23 Aug 1978 · continuation in part
Priority: CH 10402/7725 Aug 1977
Granted: 5 May 1981
Term ends: Not estimatedThe source records don’t support an estimate.

Classification10 codes

F04C 14/26
Characterised by using valves controlling pressure or flow rate, e.g. discharge valves or unloading valves: using bypass channels
Y10T 137/2584
Including controlling main line flow: relief or bypass closes as main opens
Y10T 137/7737
Line condition change responsive valves: thermal responsive
Y10T 137/7839
Plural: dividing and recombining in a single flow path