US 4,377,183 AGranted

Adjustable flow restricting valve

AssigneeAtlas Copco Aktiebolag

InventorsFolke L. Johansson, Bengt F. S. Svenning

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Abstract

An adjustable flow restricting valve for speed control of a pneumatic motor, comprising a tube shaped valve body which is rotatably supported in a boring and which is provided with a recess for uncovering fully or partly an outlet opening in the boring. The restricting valve is associated with a control valve for operation of a pneumatic motor. The tube shaped valve body is rotatable by means of a maneuver screw which extends transversely relative to the valve body and which forms a worm gear with the latter. The high gear ratio of the worm gear enables a precise setting of the valve body. In a multiple arrangement of control valves, the tubular valve body of one flow restricting valve forms part of the exhaust passage from one or more flow restricting valves, located upstream thereof.

Claims16

Dependent claims

An adjustable flow restricting valve comprising:

a housing (11);
a first passage (26,27) extending completely through said housing (11) and comprising a cylindrical bore (27);
a tubular valve body (28) open ended at both ends thereof and rotatably supported in said bore (27) and forming a part of said first passage (26,27), said tubular valve body (28) being formed of a plastic material;
a second passage (25) in said housing (11) extending laterally from said first passage (26,27);
said tubular valve body (28) being cylindrical and having a longitudinal rotation axis about which it is rotatable in said bore (27), said valve body (28) having a lateral opening (29) therein by means of which said valve body (28) in response to its angular position controls communication between said first and second passages (25,26);
and
a maneuver means (30) movably supported in said housing (11) and contacting said valve body (28) for producing angular displacement of said valve body (28) in said bore of said first passage (26,27) about said longitudinal rotation axis of said valve body (28), said maneuver means (30) including an elongated screw (30) arranged with its longitudinal axis perpendicular to a plane which includes the rotation axis of said valve body (28) and directly contacting said valve body (28) to form a worm gear with said valve body (28), said elongated screw (30) having self-tapping threads thereon which are arranged to cut gear teeth on said plastic tubular valve body (28).

4 more elements

An adjustable flow restricting valve comprising:

a housing (11) which includes first and second subplates;
a first passage (26,27) extending completely through said first and second subplates of said housing (11) and comprising a cylindrical bore (27);
a first tubular valve body (28) open ended at both ends thereof and rotatably supported in said bore (27) and forming a part of said first passage (26,27), said first tubular valve body being in said first subplate;
a second passage (25) in said first subplate of said housing (11) and extending laterally from said first passage (26,27);
said first tubular valve body (28) being cylindrical and having a longitudinal rotation axis about which it is rotatable in said bore (27), said first valve body (28) having a lateral opening (29) therein by means of which said first valve body (28) in response to its angular position controls communication between said first and second passages (25,26);
a first maneuver means (30) movably supported in said housing (11) and contacting said first valve body (28) for producing angular displacement of said first valve body in said bore of said first passage (26,27) about said longitudinal rotation axis of said first valve body;
a second open ended tubular valve body rotatably supported in said bore (27), said second tubular valve body being in said second subplate;
a third passage in said second subplate of said housing (11) and extending laterally from said first passage (26,27);
said second tubular valve body being cylindrical and having a longitudinal rotation axis about which it is rotatable in said bore of said first passage, said second valve body having a lateral opening therein by means of which said second valve body in response to its angular position controls communication between said first and third passages;
and
second maneuver means movably supported in said housing and contacting said second valve body for producing angular displacement of said second valve body in said bore of said first passage about said longitudinal rotation axis of said second valve body;
said first and second valve bodies being in flow communication with each other in said first passage.

9 more elements

An adjustable flow restricting valve comprising:

a housing (11);
a first passage (26,27) extending completely through said housing (11) and comprising a cylindrical bore (27);
a first tubular valve body (28) open ended at both ends thereof and rotatably supported in said bore (27) and forming a part of said first passage (26,27);
a second passage (25) in said housing (11) extending laterally from said first passage (26,27);
said first tubular valve body (28) being cylindrical and having a longitudinal rotation axis about which it is rotatable in said bore (27), said first valve body (28) having a lateral opening (29) therein by means of which said first valve body (28) in response to its angular position controls communication between said first and second passages (25,26);
a first maneuver means (30) movably supported in said housing (11) and contacting said first valve body (28) for producing angular displacement of said first valve body in said bore of said first passage (26,27) about said longitudinal rotation axis of said first valve body, said first maneuver means including a first elongated maneuver screw arranged with its longitudinal axis perpendicular to a plane which includes the rotation axis of said first valve body (28) and which directly contacts said first valve body to form a worm gear with said first valve body;
a second open ended tubular valve body rotatably supported in said bore (27);
a third passage in said housing and extending laterally from said first passage (26,27);
said second tubular valve body being cylindrical and having a longitudinal rotation axis about which it is rotatable in said bore of said first passage, said second valve body having a lateral opening therein by means of which said second valve body in response to its angular position controls communication between said first and third passages;
and
second maneuver means movably supported in said housing and contacting said second valve body for producing angular displacement of said second valve body in said bore of said first passage about said longitudinal rotation axis of said second valve body, said second maneuver means including a second elongated maneuver screw arranged with its longitudinal axis perpendicular to a plane which includes the rotation axis of said second valve body and which directly contacts said second valve body to form a worm gear with said second valve body;
said first and second valve bodies being in flow communication with each other in said first passage.

9 more elements

An adjustable flow restricting valve comprising:

a housing (11);
a first passage (26,27) extending completely through said housing (11) and comprising a cylindrical bore (27);
a first tubular valve body (28) formed of plastic material, said first tubular valve body (28) being open ended at both ends thereof and rotatably supported in said bore (27) and forming a part of said first passage (26,27);
a second passage (25) in said housing (11) extending laterally from said first passage (26,27);
said first plastic tubular valve body (28) being cylindrical and having a longitudinal rotation axis about which it is rotatable in said bore (27), said first plastic valve body (28) having a lateral opening (29) therein by means of which said first plastic valve body (28) in responsive to its angular position controls communication between said first and second passages (25,26);
a first maneuver means (30) including a first screw having self-tapping threads thereon and which is movably supported in said housing (11) and contacting said first plastic valve body (28) for producing angular displacement of said first valve body in said bore of said first passage (26,27) about said longitudinal rotation axis of said first valve body, said first screw being arranged such that its self-tapping threads cut gear teeth on said first plastic valve body;
a second open ended tubular valve body formed of plastic material and rotatably supported in said bore (27);
a third passage in said housing and extending laterally from said first passage (26,27);
said second plastic tubular valve body being cylindrical and having a longitudinal rotation axis about which it is rotatable in said bore of said first passage, said second plastic valve body having a lateral opening therein by means of which said second plastic valve body in response to its angular position controls communication between said first and third passages;
and
second maneuver means including a second screw having self-tapping threads thereon and which is movably supported in said housing and contacting said second plastic valve body for producing angular displacement of said second valve body in said bore of said first passage about said longitudinal rotation axis of said second valve body, said second screw being arranged such that its self-tapping threads cut gear teeth on said second plastic valve body;
said first and second valve bodies being in flow communication with each other in said first passage.

9 more elements

Dependencies are inferred from the claim text.