Valve device, especially a combined proportional-distributing valve device
First Claim
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1. A proportional-directioral control valve apparatus having a total operating range including a first part having a proportional range and a second part, said apparatus comprising:
- a valve body including;
at least one supply channel having a cross-sectional area with a connection; and
one return channel having a cross-sectional area with a connection, said return channel having a pressure therein;
an axially moveable valve piston disposed in said valve body, said valve piston including;
control edges configured to open and close said connection of said cross-sectional area of said supply channel and said connection of said cross-sectional area of said return channel;
an interior opening;
an outer periphery; and
a connecting orifice between said interior opening and said outer periphery, said connecting orifice having a mouth at said outer periphery such that said connecting orifice is in direct communication with said return channel of said valve body;
an actuator configured for exerting an activation force upon said valve piston; and
a device configured for generating a force opposing said activation force at least over the proportional range of the total operating range of said valve apparatus, said opposing force being dependent upon said pressure in said return channel, said device including;
a plunger disposed at least partially inside said interior opening of said valve piston, said plunger and said valve piston being moveable relative to each other in an axial direction, said plunger receiving a first force dependent upon said pressure in said return channel of said valve body, said plunger having at least one protruding flange located on the periphery thereof and disposed inside said interior opening, said at least one protruding flange configured to prevent said plunger from slipping out of said interior opening;
a limit stop inside said valve body, said limit stop being configured for limiting said axial movement of said plunger in a direction of said first force received by said plunger; and
a first energy storage unit configured for exerting a second force upon said plunger in said valve body, said first energy storage unit being configured for opposing at least one of said activation force and said first force, said energy storage unit having, a pre-load corresponding to said first force at a predetermined proportional pressure and thereby being configured for establishing the proportional range of the total operating range of an axial displacement of said valve piston and said plunger.
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Abstract
A valve device includes a valve housing with at least one inlet channel and an outlet channel. A valve piston can be moved axially in the valve housing and has control edges for releasing and blocking the connection between the cross sections of the inlet and outlet channels. A regulating device applies the actuating force to the valve piston. Elements produce a force opposing the actuating force through at least a part (a proportional area) of the overall working range of the valve device, depending on the pressure in the outlet channel.
23 Citations
14 Claims
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1. A proportional-directioral control valve apparatus having a total operating range including a first part having a proportional range and a second part, said apparatus comprising:
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a valve body including;
at least one supply channel having a cross-sectional area with a connection; and
one return channel having a cross-sectional area with a connection, said return channel having a pressure therein;
an axially moveable valve piston disposed in said valve body, said valve piston including;
control edges configured to open and close said connection of said cross-sectional area of said supply channel and said connection of said cross-sectional area of said return channel;
an interior opening;
an outer periphery; and
a connecting orifice between said interior opening and said outer periphery, said connecting orifice having a mouth at said outer periphery such that said connecting orifice is in direct communication with said return channel of said valve body;
an actuator configured for exerting an activation force upon said valve piston; and
a device configured for generating a force opposing said activation force at least over the proportional range of the total operating range of said valve apparatus, said opposing force being dependent upon said pressure in said return channel, said device including;
a plunger disposed at least partially inside said interior opening of said valve piston, said plunger and said valve piston being moveable relative to each other in an axial direction, said plunger receiving a first force dependent upon said pressure in said return channel of said valve body, said plunger having at least one protruding flange located on the periphery thereof and disposed inside said interior opening, said at least one protruding flange configured to prevent said plunger from slipping out of said interior opening;
a limit stop inside said valve body, said limit stop being configured for limiting said axial movement of said plunger in a direction of said first force received by said plunger; and
a first energy storage unit configured for exerting a second force upon said plunger in said valve body, said first energy storage unit being configured for opposing at least one of said activation force and said first force, said energy storage unit having, a pre-load corresponding to said first force at a predetermined proportional pressure and thereby being configured for establishing the proportional range of the total operating range of an axial displacement of said valve piston and said plunger. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A base valve unit, comprising:
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a valve body including;
at least one supply channel having a cross-sectional area with a connection; and
one return channel having a cross-sectional area with a connection, said return channel having a pressure therein;
an axially moveable valve piston disposed in said valve body, said valve piston including;
control edges configured to open and close said connection of said cross-sectional area of said supply channel and said connection of said cross-sectional area of said return channel;
an interior opening;
an outer periphery; and
a connecting orifice between said interior opening and said outer periphery, said connecting orifice having a mouth at said outer periphery such that said connecting orifice is in direct communication with said return channel of said valve body;
an actuator configured for exerting an activation force upon said valve piston;
a plunger disposed at least partially inside interior opening of said valve piston, said plunger including a periphery with at least one protruding flange, said at least one protruding flange being disposed inside interior opening of said valve piston, said at least one protruding flange configured to prevent said plunger from slipping out of said interior opening, said plunger and said valve piston being moveable relative to each other in an axial direction, said plunger receiving said pressure in said return channel of said valve body;
a limit stop disposed in said valve body; and
a first energy storage unit associated with said limit stop in said valve body and with said plunger, said first energy storage unit being configured for directly supporting said plunger, said first energy storage unit being configured for exerting a support force in an installed position of said first energy storage unit, said support force being approximately equally to a force of said plunger at a desired proportional pressure. - View Dependent Claims (13, 14)
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Specification